Merge branch 'master' of github.com:mcMMO-Dev/mcMMO into tridentsxbows

src/main/java/com/gmail/nossr50/api/PartyAPI.java

@@ -185,7 +185,7 @@ public final class PartyAPI {
      */
     @Deprecated
     public static List<OfflinePlayer> getOnlineAndOfflineMembers(Player player) {
-        List<OfflinePlayer> members = new ArrayList<OfflinePlayer>();
+        List<OfflinePlayer> members = new ArrayList<>();
 
         for (UUID memberUniqueId : PartyManager.getAllMembers(player).keySet()) {
             OfflinePlayer member = mcMMO.p.getServer().getOfflinePlayer(memberUniqueId);

src/main/java/com/gmail/nossr50/api/SkillAPI.java

@@ -82,7 +82,7 @@ public final class SkillAPI {
     }
 
     private static List<String> getListFromEnum(List<PrimarySkillType> skillsTypes) {
-        List<String> skills = new ArrayList<String>();
+        List<String> skills = new ArrayList<>();
 
         for (PrimarySkillType primarySkillType : skillsTypes) {
             skills.add(primarySkillType.name());

src/main/java/com/gmail/nossr50/chat/ChatManagerFactory.java

@@ -6,8 +6,8 @@ import org.bukkit.plugin.Plugin;
 import java.util.HashMap;
 
 public class ChatManagerFactory {
-    private static final HashMap<Plugin, AdminChatManager> adminChatManagers = new HashMap<Plugin, AdminChatManager>();
-    private static final HashMap<Plugin, PartyChatManager> partyChatManagers = new HashMap<Plugin, PartyChatManager>();
+    private static final HashMap<Plugin, AdminChatManager> adminChatManagers = new HashMap<>();
+    private static final HashMap<Plugin, PartyChatManager> partyChatManagers = new HashMap<>();
 
     public static ChatManager getChatManager(Plugin plugin, ChatMode mode) {
         switch (mode) {

src/main/java/com/gmail/nossr50/commands/MHDCommand.java

@@ -10,13 +10,14 @@ import com.google.common.collect.ImmutableList;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
 public class MHDCommand implements TabExecutor {
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (mcMMO.getDatabaseManager() instanceof SQLDatabaseManager) {
             SQLDatabaseManager m = (SQLDatabaseManager) mcMMO.getDatabaseManager();
             m.resetMobHealthSettings();
@@ -39,7 +40,7 @@ public class MHDCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         return ImmutableList.of();
     }
 }

src/main/java/com/gmail/nossr50/commands/McImportCommand.java

@@ -7,6 +7,7 @@ import org.bukkit.Material;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
 
 import java.io.*;
 import java.util.ArrayList;
@@ -17,15 +18,12 @@ public class McImportCommand implements CommandExecutor {
     int fileAmount;
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 0:
-                importModConfig();
-                return true;
-
-            default:
-                return false;
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 0) {
+            importModConfig();
+            return true;
         }
+        return false;
     }
 
     public boolean importModConfig() {
@@ -34,7 +32,7 @@ public class McImportCommand implements CommandExecutor {
         mcMMO.p.getLogger().info("Starting import of mod materials...");
         fileAmount = 0;
 
-        HashMap<ModConfigType, ArrayList<String>> materialNames = new HashMap<ModConfigType, ArrayList<String>>();
+        HashMap<ModConfigType, ArrayList<String>> materialNames = new HashMap<>();
 
         BufferedReader in = null;
 
@@ -66,11 +64,10 @@ public class McImportCommand implements CommandExecutor {
                 ModConfigType type = ModConfigType.getModConfigType(materialName);
 
                 if (!materialNames.containsKey(type)) {
-                    materialNames.put(type, new ArrayList<String>());
+                    materialNames.put(type, new ArrayList<>());
                 }
 
                 materialNames.get(type).add(materialName);
-                continue;
             }
         }
         catch (FileNotFoundException e) {
@@ -94,13 +91,13 @@ public class McImportCommand implements CommandExecutor {
 
     private void createOutput(HashMap<ModConfigType, ArrayList<String>> materialNames) {
         for (ModConfigType modConfigType : materialNames.keySet()) {
-            HashMap<String, ArrayList<String>> materialNamesType = new HashMap<String, ArrayList<String>>();
+            HashMap<String, ArrayList<String>> materialNamesType = new HashMap<>();
 
             for (String materialName : materialNames.get(modConfigType)) {
                 String modName = Misc.getModName(materialName);
 
                 if (!materialNamesType.containsKey(modName)) {
-                    materialNamesType.put(modName, new ArrayList<String>());
+                    materialNamesType.put(modName, new ArrayList<>());
                 }
 
                 materialNamesType.get(modName).add(materialName);
@@ -170,16 +167,10 @@ public class McImportCommand implements CommandExecutor {
 
                 out = new FileWriter(outputFile);
                 out.write(writer.toString());
-            }
-            catch (IOException e) {
+            } catch (Exception e) {
                 e.printStackTrace();
                 return;
-            }
-            catch (Exception e) {
-                e.printStackTrace();
-                return;
-            }
-            finally {
+            } finally {
                 tryClose(out);
                 fileAmount++;
             }
@@ -202,7 +193,7 @@ public class McImportCommand implements CommandExecutor {
     }
 
     private HashMap<String, ArrayList<String>> getConfigSectionsBlocks(String modName, HashMap<String, ArrayList<String>> materialNames) {
-        HashMap<String, ArrayList<String>> configSections = new HashMap<String, ArrayList<String>>();
+        HashMap<String, ArrayList<String>> configSections = new HashMap<>();
 
         // Go through all the materials and categorise them under a skill
         for (String materialName : materialNames.get(modName)) {
@@ -221,7 +212,7 @@ public class McImportCommand implements CommandExecutor {
             }
 
             if (!configSections.containsKey(skillName)) {
-                configSections.put(skillName, new ArrayList<String>());
+                configSections.put(skillName, new ArrayList<>());
             }
 
             ArrayList<String> skillContents = configSections.get(skillName);
@@ -241,7 +232,7 @@ public class McImportCommand implements CommandExecutor {
     }
 
     private HashMap<String, ArrayList<String>> getConfigSectionsTools(String modName, HashMap<String, ArrayList<String>> materialNames) {
-        HashMap<String, ArrayList<String>> configSections = new HashMap<String, ArrayList<String>>();
+        HashMap<String, ArrayList<String>> configSections = new HashMap<>();
 
         // Go through all the materials and categorise them under a tool type
         for (String materialName : materialNames.get(modName)) {
@@ -266,7 +257,7 @@ public class McImportCommand implements CommandExecutor {
             }
 
             if (!configSections.containsKey(toolType)) {
-                configSections.put(toolType, new ArrayList<String>());
+                configSections.put(toolType, new ArrayList<>());
             }
 
             ArrayList<String> skillContents = configSections.get(toolType);
@@ -281,7 +272,7 @@ public class McImportCommand implements CommandExecutor {
     }
 
     private HashMap<String, ArrayList<String>> getConfigSectionsArmor(String modName, HashMap<String, ArrayList<String>> materialNames) {
-        HashMap<String, ArrayList<String>> configSections = new HashMap<String, ArrayList<String>>();
+        HashMap<String, ArrayList<String>> configSections = new HashMap<>();
 
         // Go through all the materials and categorise them under an armor type
         for (String materialName : materialNames.get(modName)) {
@@ -300,7 +291,7 @@ public class McImportCommand implements CommandExecutor {
             }
 
             if (!configSections.containsKey(toolType)) {
-                configSections.put(toolType, new ArrayList<String>());
+                configSections.put(toolType, new ArrayList<>());
             }
 
             ArrayList<String> skillContents = configSections.get(toolType);
@@ -326,14 +317,14 @@ public class McImportCommand implements CommandExecutor {
     }
 
     private HashMap<String, ArrayList<String>> getConfigSectionsUnknown(String modName, HashMap<String, ArrayList<String>> materialNames) {
-        HashMap<String, ArrayList<String>> configSections = new HashMap<String, ArrayList<String>>();
+        HashMap<String, ArrayList<String>> configSections = new HashMap<>();
 
         // Go through all the materials and print them
         for (String materialName : materialNames.get(modName)) {
             String configKey = "UNIDENTIFIED";
 
             if (!configSections.containsKey(configKey)) {
-                configSections.put(configKey, new ArrayList<String>());
+                configSections.put(configKey, new ArrayList<>());
             }
 
             ArrayList<String> skillContents = configSections.get(configKey);

src/main/java/com/gmail/nossr50/commands/McconvertCommand.java

@@ -12,6 +12,7 @@ import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -22,12 +23,12 @@ public class McconvertCommand implements TabExecutor {
     private static final List<String> DATABASE_TYPES;
     private static final List<String> SUBCOMMANDS = ImmutableList.of("database", "experience");
 
-    private CommandExecutor databaseConvertCommand = new ConvertDatabaseCommand();
-    private CommandExecutor experienceConvertCommand = new ConvertExperienceCommand();
+    private final CommandExecutor databaseConvertCommand = new ConvertDatabaseCommand();
+    private final CommandExecutor experienceConvertCommand = new ConvertExperienceCommand();
 
     static {
-        ArrayList<String> formulaTypes = new ArrayList<String>();
-        ArrayList<String> databaseTypes = new ArrayList<String>();
+        ArrayList<String> formulaTypes = new ArrayList<>();
+        ArrayList<String> databaseTypes = new ArrayList<>();
 
         for (FormulaType type : FormulaType.values()) {
             formulaTypes.add(type.toString());
@@ -53,34 +54,31 @@ public class McconvertCommand implements TabExecutor {
     }
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                if (args[0].equalsIgnoreCase("database") || args[0].equalsIgnoreCase("db")) {
-                    return databaseConvertCommand.onCommand(sender, command, label, args);
-                }
-                else if (args[0].equalsIgnoreCase("experience") || args[0].equalsIgnoreCase("xp") || args[1].equalsIgnoreCase("exp")) {
-                    return experienceConvertCommand.onCommand(sender, command, label, args);
-                }
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {
+            if (args[0].equalsIgnoreCase("database") || args[0].equalsIgnoreCase("db")) {
+                return databaseConvertCommand.onCommand(sender, command, label, args);
+            } else if (args[0].equalsIgnoreCase("experience") || args[0].equalsIgnoreCase("xp") || args[1].equalsIgnoreCase("exp")) {
+                return experienceConvertCommand.onCommand(sender, command, label, args);
+            }
 
-                return false;
-            default:
-                return false;
+            return false;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         switch (args.length) {
             case 1:
-                return StringUtil.copyPartialMatches(args[0], SUBCOMMANDS, new ArrayList<String>(SUBCOMMANDS.size()));
+                return StringUtil.copyPartialMatches(args[0], SUBCOMMANDS, new ArrayList<>(SUBCOMMANDS.size()));
             case 2:
                 if (args[0].equalsIgnoreCase("database") || args[0].equalsIgnoreCase("db")) {
-                    return StringUtil.copyPartialMatches(args[0], DATABASE_TYPES, new ArrayList<String>(DATABASE_TYPES.size()));
+                    return StringUtil.copyPartialMatches(args[0], DATABASE_TYPES, new ArrayList<>(DATABASE_TYPES.size()));
                 }
 
                 if (args[0].equalsIgnoreCase("experience") || args[0].equalsIgnoreCase("xp") || args[0].equalsIgnoreCase("exp")) {
-                    return StringUtil.copyPartialMatches(args[0], FORMULA_TYPES, new ArrayList<String>(FORMULA_TYPES.size()));
+                    return StringUtil.copyPartialMatches(args[0], FORMULA_TYPES, new ArrayList<>(FORMULA_TYPES.size()));
                 }
 
                 return ImmutableList.of();

src/main/java/com/gmail/nossr50/commands/McmmoCommand.java

@@ -9,10 +9,11 @@ import org.bukkit.ChatColor;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
 
 public class McmmoCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 0:
                 if (!Permissions.mcmmoDescription(sender)) {

src/main/java/com/gmail/nossr50/commands/McnotifyCommand.java

@@ -9,35 +9,33 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
 public class McnotifyCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
 
-        switch (args.length) {
-            case 0:
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer((Player) sender);
+        if (args.length == 0) {
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer((Player) sender);
 
-                //Not Loaded yet
-                if(mcMMOPlayer == null)
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+            //Not Loaded yet
+            if (mcMMOPlayer == null)
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
 
-                sender.sendMessage(LocaleLoader.getString("Commands.Notifications." + (mcMMOPlayer.useChatNotifications() ? "Off" : "On")));
-                mcMMOPlayer.toggleChatNotifications();
-                return true;
-
-            default:
-                return false;
+            sender.sendMessage(LocaleLoader.getString("Commands.Notifications." + (mcMMOPlayer.useChatNotifications() ? "Off" : "On")));
+            mcMMOPlayer.toggleChatNotifications();
+            return true;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         return ImmutableList.of();
     }
 }

src/main/java/com/gmail/nossr50/commands/McscoreboardCommand.java

@@ -9,6 +9,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -17,7 +18,7 @@ public class McscoreboardCommand implements TabExecutor {
     private static final List<String> FIRST_ARGS = ImmutableList.of("keep", "time", "clear");
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
@@ -69,13 +70,11 @@ public class McscoreboardCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                return StringUtil.copyPartialMatches(args[0], FIRST_ARGS, new ArrayList<String>(FIRST_ARGS.size()));
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            return StringUtil.copyPartialMatches(args[0], FIRST_ARGS, new ArrayList<>(FIRST_ARGS.size()));
         }
+        return ImmutableList.of();
     }
 
     private boolean help(CommandSender sender) {

src/main/java/com/gmail/nossr50/commands/ToggleCommand.java

@@ -8,13 +8,14 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public abstract class ToggleCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 0:
                 if (CommandUtils.noConsoleUsage(sender)) {
@@ -60,14 +61,12 @@ public abstract class ToggleCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
-                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
+            return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<>(playerNames.size()));
         }
+        return ImmutableList.of();
     }
 
     protected abstract boolean hasOtherPermission(CommandSender sender);

src/main/java/com/gmail/nossr50/commands/XprateCommand.java

@@ -16,6 +16,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -24,7 +25,7 @@ public class XprateCommand implements TabExecutor {
     private final double ORIGINAL_XP_RATE = ExperienceConfig.getInstance().getExperienceGainsGlobalMultiplier();
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 1:
                 if (!args[0].equalsIgnoreCase("reset") &&  !args[0].equalsIgnoreCase("clear")) {
@@ -116,16 +117,16 @@ public class XprateCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         switch (args.length) {
             case 1:
                 if (StringUtils.isInt(args[0])) {
                     return ImmutableList.of();
                 }
 
-                return StringUtil.copyPartialMatches(args[0], CommandUtils.RESET_OPTIONS, new ArrayList<String>(CommandUtils.RESET_OPTIONS.size()));
+                return StringUtil.copyPartialMatches(args[0], CommandUtils.RESET_OPTIONS, new ArrayList<>(CommandUtils.RESET_OPTIONS.size()));
             case 2:
-                return StringUtil.copyPartialMatches(args[1], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<String>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
+                return StringUtil.copyPartialMatches(args[1], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
             default:
                 return ImmutableList.of();
         }

src/main/java/com/gmail/nossr50/commands/admin/McmmoReloadLocaleCommand.java

@@ -5,26 +5,25 @@ import com.gmail.nossr50.util.Permissions;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * @author Mark Vainomaa
  */
 public final class McmmoReloadLocaleCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 0:
-                if (!Permissions.reloadlocale(sender)) {
-                    sender.sendMessage(command.getPermissionMessage());
-                    return true;
-                }
-
-                LocaleLoader.reloadLocale();
-                sender.sendMessage(LocaleLoader.getString("Locale.Reloaded"));
-
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 0) {
+            if (!Permissions.reloadlocale(sender)) {
+                sender.sendMessage(command.getPermissionMessage());
                 return true;
-            default:
-                return false;
+            }
+
+            LocaleLoader.reloadLocale();
+            sender.sendMessage(LocaleLoader.getString("Locale.Reloaded"));
+
+            return true;
         }
+        return false;
     }
 }

src/main/java/com/gmail/nossr50/commands/admin/PlayerDebugCommand.java

@@ -7,11 +7,12 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PlayerDebugCommand implements CommandExecutor {
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if(sender instanceof Player) {
             McMMOPlayer mcMMOPlayer = UserManager.getPlayer((Player) sender);
             mcMMOPlayer.toggleDebugMode(); //Toggle debug mode

src/main/java/com/gmail/nossr50/commands/chat/ChatCommand.java

@@ -16,12 +16,13 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public abstract class ChatCommand implements TabExecutor {
-    private ChatMode chatMode;
+    private final ChatMode chatMode;
     protected ChatManager chatManager;
 
     public ChatCommand(ChatMode chatMode) {
@@ -30,7 +31,7 @@ public abstract class ChatCommand implements TabExecutor {
     }
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         McMMOPlayer mcMMOPlayer;
 
         switch (args.length) {
@@ -88,13 +89,11 @@ public abstract class ChatCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                return StringUtil.copyPartialMatches(args[0], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<String>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            return StringUtil.copyPartialMatches(args[0], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
         }
+        return ImmutableList.of();
     }
 
     protected String buildChatMessage(String[] args, int index) {

src/main/java/com/gmail/nossr50/commands/database/ConvertDatabaseCommand.java

@@ -13,62 +13,59 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class ConvertDatabaseCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                DatabaseType previousType = DatabaseType.getDatabaseType(args[1]);
-                DatabaseType newType = mcMMO.getDatabaseManager().getDatabaseType();
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {
+            DatabaseType previousType = DatabaseType.getDatabaseType(args[1]);
+            DatabaseType newType = mcMMO.getDatabaseManager().getDatabaseType();
 
-                if (previousType == newType || (newType == DatabaseType.CUSTOM && DatabaseManagerFactory.getCustomDatabaseManagerClass().getSimpleName().equalsIgnoreCase(args[1]))) {
-                    sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Database.Same", newType.toString()));
-                    return true;
-                }
+            if (previousType == newType || (newType == DatabaseType.CUSTOM && DatabaseManagerFactory.getCustomDatabaseManagerClass().getSimpleName().equalsIgnoreCase(args[1]))) {
+                sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Database.Same", newType.toString()));
+                return true;
+            }
 
-                DatabaseManager oldDatabase = DatabaseManagerFactory.createDatabaseManager(previousType);
+            DatabaseManager oldDatabase = DatabaseManagerFactory.createDatabaseManager(previousType);
 
-                if (previousType == DatabaseType.CUSTOM) {
-                    Class<?> clazz;
+            if (previousType == DatabaseType.CUSTOM) {
+                Class<?> clazz;
 
-                    try {
-                        clazz = Class.forName(args[1]);
+                try {
+                    clazz = Class.forName(args[1]);
 
-                        if (!DatabaseManager.class.isAssignableFrom(clazz)) {
-                            sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Database.InvalidType", args[1]));
-                            return true;
-                        }
-
-                        oldDatabase = DatabaseManagerFactory.createCustomDatabaseManager((Class<? extends DatabaseManager>) clazz);
-                    }
-                    catch (Throwable e) {
-                        e.printStackTrace();
+                    if (!DatabaseManager.class.isAssignableFrom(clazz)) {
                         sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Database.InvalidType", args[1]));
                         return true;
                     }
+
+                    oldDatabase = DatabaseManagerFactory.createCustomDatabaseManager((Class<? extends DatabaseManager>) clazz);
+                } catch (Throwable e) {
+                    e.printStackTrace();
+                    sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Database.InvalidType", args[1]));
+                    return true;
+                }
+            }
+
+            sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Database.Start", previousType.toString(), newType.toString()));
+
+            UserManager.saveAll();
+            UserManager.clearAll();
+
+            for (Player player : mcMMO.p.getServer().getOnlinePlayers()) {
+                PlayerProfile profile = oldDatabase.loadPlayerProfile(player.getUniqueId());
+
+                if (profile.isLoaded()) {
+                    mcMMO.getDatabaseManager().saveUser(profile);
                 }
 
-                sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Database.Start", previousType.toString(), newType.toString()));
+                new PlayerProfileLoadingTask(player).runTaskLaterAsynchronously(mcMMO.p, 1); // 1 Tick delay to ensure the player is marked as online before we begin loading
+            }
 
-                UserManager.saveAll();
-                UserManager.clearAll();
-
-                for (Player player : mcMMO.p.getServer().getOnlinePlayers()) {
-                    PlayerProfile profile = oldDatabase.loadPlayerProfile(player.getUniqueId());
-
-                    if (profile.isLoaded()) {
-                        mcMMO.getDatabaseManager().saveUser(profile);
-                    }
-
-                    new PlayerProfileLoadingTask(player).runTaskLaterAsynchronously(mcMMO.p, 1); // 1 Tick delay to ensure the player is marked as online before we begin loading
-                }
-
-                new DatabaseConversionTask(oldDatabase, sender, previousType.toString(), newType.toString()).runTaskAsynchronously(mcMMO.p);
-                return true;
-
-            default:
-                return false;
+            new DatabaseConversionTask(oldDatabase, sender, previousType.toString(), newType.toString()).runTaskAsynchronously(mcMMO.p);
+            return true;
         }
+        return false;
     }
 }

src/main/java/com/gmail/nossr50/commands/database/McpurgeCommand.java

@@ -7,30 +7,28 @@ import com.google.common.collect.ImmutableList;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
 public class McpurgeCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 0:
-                mcMMO.getDatabaseManager().purgePowerlessUsers();
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 0) {
+            mcMMO.getDatabaseManager().purgePowerlessUsers();
 
-                if (Config.getInstance().getOldUsersCutoff() != -1) {
-                    mcMMO.getDatabaseManager().purgeOldUsers();
-                }
+            if (Config.getInstance().getOldUsersCutoff() != -1) {
+                mcMMO.getDatabaseManager().purgeOldUsers();
+            }
 
-                sender.sendMessage(LocaleLoader.getString("Commands.mcpurge.Success"));
-                return true;
-
-            default:
-                return false;
+            sender.sendMessage(LocaleLoader.getString("Commands.mcpurge.Success"));
+            return true;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         return ImmutableList.of();
     }
 }

src/main/java/com/gmail/nossr50/commands/database/McremoveCommand.java

@@ -10,6 +10,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -17,43 +18,37 @@ import java.util.UUID;
 
 public class McremoveCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 1:
-                String playerName = CommandUtils.getMatchedPlayerName(args[0]);
-
-                if (UserManager.getOfflinePlayer(playerName) == null && CommandUtils.unloadedProfile(sender, mcMMO.getDatabaseManager().loadPlayerProfile(playerName, false))) {
-                    return true;
-                }
-
-                UUID uuid = null;
-
-                if(Bukkit.getPlayer(playerName) != null) {
-                    uuid = Bukkit.getPlayer(playerName).getUniqueId();
-                }
-
-                if (mcMMO.getDatabaseManager().removeUser(playerName, uuid)) {
-                    sender.sendMessage(LocaleLoader.getString("Commands.mcremove.Success", playerName));
-                }
-                else {
-                    sender.sendMessage(playerName + " could not be removed from the database."); // Pretty sure this should NEVER happen.
-                }
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 1) {
+            String playerName = CommandUtils.getMatchedPlayerName(args[0]);
 
+            if (UserManager.getOfflinePlayer(playerName) == null && CommandUtils.unloadedProfile(sender, mcMMO.getDatabaseManager().loadPlayerProfile(playerName, false))) {
                 return true;
+            }
 
-            default:
-                return false;
+            UUID uuid = null;
+
+            if (Bukkit.getPlayer(playerName) != null) {
+                uuid = Bukkit.getPlayer(playerName).getUniqueId();
+            }
+
+            if (mcMMO.getDatabaseManager().removeUser(playerName, uuid)) {
+                sender.sendMessage(LocaleLoader.getString("Commands.mcremove.Success", playerName));
+            } else {
+                sender.sendMessage(playerName + " could not be removed from the database."); // Pretty sure this should NEVER happen.
+            }
+
+            return true;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
-                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
+            return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<>(playerNames.size()));
         }
+        return ImmutableList.of();
     }
 }

src/main/java/com/gmail/nossr50/commands/database/MmoshowdbCommand.java

@@ -7,31 +7,29 @@ import com.google.common.collect.ImmutableList;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
 public class MmoshowdbCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 0:
-                Class<?> clazz = DatabaseManagerFactory.getCustomDatabaseManagerClass();
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 0) {
+            Class<?> clazz = DatabaseManagerFactory.getCustomDatabaseManagerClass();
 
-                if (clazz != null) {
-                    sender.sendMessage(LocaleLoader.getString("Commands.mmoshowdb", clazz.getName()));
-                    return true;
-                }
-
-                sender.sendMessage(LocaleLoader.getString("Commands.mmoshowdb", (Config.getInstance().getUseMySQL() ? "sql" : "flatfile")));
+            if (clazz != null) {
+                sender.sendMessage(LocaleLoader.getString("Commands.mmoshowdb", clazz.getName()));
                 return true;
+            }
 
-            default:
-                return false;
+            sender.sendMessage(LocaleLoader.getString("Commands.mmoshowdb", (Config.getInstance().getUseMySQL() ? "sql" : "flatfile")));
+            return true;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         return ImmutableList.of();
     }
 }

src/main/java/com/gmail/nossr50/commands/experience/ConvertExperienceCommand.java

@@ -10,42 +10,40 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.Locale;
 
 public class ConvertExperienceCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                FormulaType previousType = mcMMO.getFormulaManager().getPreviousFormulaType();
-                FormulaType newType = FormulaType.getFormulaType(args[1].toUpperCase(Locale.ENGLISH));
-
-                if (newType == FormulaType.UNKNOWN) {
-                    sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Experience.Invalid"));
-                    return true;
-                }
-
-                if (previousType == newType) {
-                    sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Experience.Same", newType.toString()));
-                    return true;
-                }
-
-                sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Experience.Start", previousType.toString(), newType.toString()));
-
-                UserManager.saveAll();
-                UserManager.clearAll();
-
-                new FormulaConversionTask(sender, newType).runTaskLater(mcMMO.p, 1);
-
-                for (Player player : mcMMO.p.getServer().getOnlinePlayers()) {
-                    new PlayerProfileLoadingTask(player).runTaskLaterAsynchronously(mcMMO.p, 1); // 1 Tick delay to ensure the player is marked as online before we begin loading
-                }
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {
+            FormulaType previousType = mcMMO.getFormulaManager().getPreviousFormulaType();
+            FormulaType newType = FormulaType.getFormulaType(args[1].toUpperCase(Locale.ENGLISH));
 
+            if (newType == FormulaType.UNKNOWN) {
+                sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Experience.Invalid"));
                 return true;
+            }
 
-            default:
-                return false;
+            if (previousType == newType) {
+                sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Experience.Same", newType.toString()));
+                return true;
+            }
+
+            sender.sendMessage(LocaleLoader.getString("Commands.mcconvert.Experience.Start", previousType.toString(), newType.toString()));
+
+            UserManager.saveAll();
+            UserManager.clearAll();
+
+            new FormulaConversionTask(sender, newType).runTaskLater(mcMMO.p, 1);
+
+            for (Player player : mcMMO.p.getServer().getOnlinePlayers()) {
+                new PlayerProfileLoadingTask(player).runTaskLaterAsynchronously(mcMMO.p, 1); // 1 Tick delay to ensure the player is marked as online before we begin loading
+            }
+
+            return true;
         }
+        return false;
     }
 }

src/main/java/com/gmail/nossr50/commands/experience/ExperienceCommand.java

@@ -14,6 +14,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -21,7 +22,7 @@ import java.util.UUID;
 
 public abstract class ExperienceCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         PrimarySkillType skill;
 
         switch (args.length) {
@@ -119,13 +120,13 @@ public abstract class ExperienceCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         switch (args.length) {
             case 1:
                 List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
-                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
+                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<>(playerNames.size()));
             case 2:
-                return StringUtil.copyPartialMatches(args[1], PrimarySkillType.SKILL_NAMES, new ArrayList<String>(PrimarySkillType.SKILL_NAMES.size()));
+                return StringUtil.copyPartialMatches(args[1], PrimarySkillType.SKILL_NAMES, new ArrayList<>(PrimarySkillType.SKILL_NAMES.size()));
             default:
                 return ImmutableList.of();
         }

src/main/java/com/gmail/nossr50/commands/experience/SkillresetCommand.java

@@ -17,6 +17,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -28,7 +29,7 @@ import java.util.UUID;
  */
 public class SkillresetCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         PrimarySkillType skill;
         switch (args.length) {
             case 1:
@@ -103,13 +104,13 @@ public class SkillresetCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         switch (args.length) {
             case 1:
                 List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
-                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
+                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<>(playerNames.size()));
             case 2:
-                return StringUtil.copyPartialMatches(args[1], PrimarySkillType.SKILL_NAMES, new ArrayList<String>(PrimarySkillType.SKILL_NAMES.size()));
+                return StringUtil.copyPartialMatches(args[1], PrimarySkillType.SKILL_NAMES, new ArrayList<>(PrimarySkillType.SKILL_NAMES.size()));
             default:
                 return ImmutableList.of();
         }

src/main/java/com/gmail/nossr50/commands/hardcore/HardcoreModeCommand.java

@@ -9,6 +9,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.text.DecimalFormat;
 import java.util.ArrayList;
@@ -18,7 +19,7 @@ public abstract class HardcoreModeCommand implements TabExecutor {
     protected final DecimalFormat percent = new DecimalFormat("##0.00%");
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 0:
                 if (!checkTogglePermissions(sender)) {
@@ -108,17 +109,15 @@ public abstract class HardcoreModeCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                if (StringUtils.isDouble(args[0])) {
-                    return ImmutableList.of();
-                }
-
-                return StringUtil.copyPartialMatches(args[0], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<String>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
-            default:
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            if (StringUtils.isDouble(args[0])) {
                 return ImmutableList.of();
+            }
+
+            return StringUtil.copyPartialMatches(args[0], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
         }
+        return ImmutableList.of();
     }
 
     protected abstract boolean checkTogglePermissions(CommandSender sender);

src/main/java/com/gmail/nossr50/commands/party/PartyAcceptCommand.java

@@ -8,40 +8,37 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyAcceptCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 1:
-                Player player = (Player) sender;
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 1) {
+            Player player = (Player) sender;
 
-                //Check if player profile is loaded
-                if(UserManager.getPlayer(player) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                    return true;
-                }
-
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
-
-
-                if (!mcMMOPlayer.hasPartyInvite()) {
-                    sender.sendMessage(LocaleLoader.getString("mcMMO.NoInvites"));
-                    return true;
-                }
-
-                // Changing parties
-                if (!PartyManager.changeOrJoinParty(mcMMOPlayer, mcMMOPlayer.getPartyInvite().getName())) {
-                    return true;
-                }
-
-                PartyManager.joinInvitedParty(mcMMOPlayer);
+            //Check if player profile is loaded
+            if (UserManager.getPlayer(player) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
                 return true;
+            }
 
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.1", "party", "accept"));
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+
+
+            if (!mcMMOPlayer.hasPartyInvite()) {
+                sender.sendMessage(LocaleLoader.getString("mcMMO.NoInvites"));
                 return true;
+            }
+
+            // Changing parties
+            if (!PartyManager.changeOrJoinParty(mcMMOPlayer, mcMMOPlayer.getPartyInvite().getName())) {
+                return true;
+            }
+
+            PartyManager.joinInvitedParty(mcMMOPlayer);
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.1", "party", "accept"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/PartyChangeOwnerCommand.java

@@ -11,34 +11,30 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyChangeOwnerCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                //Check if player profile is loaded
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                    return true;
-                }
-
-                Party playerParty = UserManager.getPlayer((Player) sender).getParty();
-                String targetName = CommandUtils.getMatchedPlayerName(args[1]);
-                OfflinePlayer target = mcMMO.p.getServer().getOfflinePlayer(targetName);
-
-                if (!playerParty.hasMember(target.getUniqueId())) {
-                    sender.sendMessage(LocaleLoader.getString("Party.NotInYourParty", targetName));
-                    return true;
-                }
-
-                PartyManager.setPartyLeader(target.getUniqueId(), playerParty);
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {//Check if player profile is loaded
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
                 return true;
+            }
 
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "owner", "<" + LocaleLoader.getString("Commands.Usage.Player") + ">"));
+            Party playerParty = UserManager.getPlayer((Player) sender).getParty();
+            String targetName = CommandUtils.getMatchedPlayerName(args[1]);
+            OfflinePlayer target = mcMMO.p.getServer().getOfflinePlayer(targetName);
+
+            if (!playerParty.hasMember(target.getUniqueId())) {
+                sender.sendMessage(LocaleLoader.getString("Party.NotInYourParty", targetName));
                 return true;
+            }
+
+            PartyManager.setPartyLeader(target.getUniqueId(), playerParty);
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "owner", "<" + LocaleLoader.getString("Commands.Usage.Player") + ">"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/PartyChangePasswordCommand.java

@@ -7,10 +7,11 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyChangePasswordCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if(UserManager.getPlayer((Player) sender) == null)
         {
             sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));

src/main/java/com/gmail/nossr50/commands/party/PartyCommand.java

@@ -16,6 +16,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -28,7 +29,7 @@ public class PartyCommand implements TabExecutor {
     private static final List<String> ITEMSHARE_COMPLETIONS = ImmutableList.of("none", "equal", "random", "loot", "mining", "herbalism", "woodcutting", "misc");
 
     static {
-        ArrayList<String> subcommands = new ArrayList<String>();
+        ArrayList<String> subcommands = new ArrayList<>();
 
         for (PartySubcommandType subcommand : PartySubcommandType.values()) {
             subcommands.add(subcommand.toString());
@@ -38,27 +39,27 @@ public class PartyCommand implements TabExecutor {
         PARTY_SUBCOMMANDS = ImmutableList.copyOf(subcommands);
     }
 
-    private CommandExecutor partyJoinCommand           = new PartyJoinCommand();
-    private CommandExecutor partyAcceptCommand         = new PartyAcceptCommand();
-    private CommandExecutor partyCreateCommand         = new PartyCreateCommand();
-    private CommandExecutor partyQuitCommand           = new PartyQuitCommand();
-    private CommandExecutor partyXpShareCommand        = new PartyXpShareCommand();
-    private CommandExecutor partyItemShareCommand      = new PartyItemShareCommand();
-    private CommandExecutor partyInviteCommand         = new PartyInviteCommand();
-    private CommandExecutor partyKickCommand           = new PartyKickCommand();
-    private CommandExecutor partyDisbandCommand        = new PartyDisbandCommand();
-    private CommandExecutor partyChangeOwnerCommand    = new PartyChangeOwnerCommand();
-    private CommandExecutor partyLockCommand           = new PartyLockCommand();
-    private CommandExecutor partyChangePasswordCommand = new PartyChangePasswordCommand();
-    private CommandExecutor partyRenameCommand         = new PartyRenameCommand();
-    private CommandExecutor partyInfoCommand           = new PartyInfoCommand();
-    private CommandExecutor partyHelpCommand           = new PartyHelpCommand();
-    private CommandExecutor partyTeleportCommand       = new PtpCommand();
-    private CommandExecutor partyChatCommand           = new PartyChatCommand();
-    private CommandExecutor partyAllianceCommand       = new PartyAllianceCommand();
+    private final CommandExecutor partyJoinCommand           = new PartyJoinCommand();
+    private final CommandExecutor partyAcceptCommand         = new PartyAcceptCommand();
+    private final CommandExecutor partyCreateCommand         = new PartyCreateCommand();
+    private final CommandExecutor partyQuitCommand           = new PartyQuitCommand();
+    private final CommandExecutor partyXpShareCommand        = new PartyXpShareCommand();
+    private final CommandExecutor partyItemShareCommand      = new PartyItemShareCommand();
+    private final CommandExecutor partyInviteCommand         = new PartyInviteCommand();
+    private final CommandExecutor partyKickCommand           = new PartyKickCommand();
+    private final CommandExecutor partyDisbandCommand        = new PartyDisbandCommand();
+    private final CommandExecutor partyChangeOwnerCommand    = new PartyChangeOwnerCommand();
+    private final CommandExecutor partyLockCommand           = new PartyLockCommand();
+    private final CommandExecutor partyChangePasswordCommand = new PartyChangePasswordCommand();
+    private final CommandExecutor partyRenameCommand         = new PartyRenameCommand();
+    private final CommandExecutor partyInfoCommand           = new PartyInfoCommand();
+    private final CommandExecutor partyHelpCommand           = new PartyHelpCommand();
+    private final CommandExecutor partyTeleportCommand       = new PtpCommand();
+    private final CommandExecutor partyChatCommand           = new PartyChatCommand();
+    private final CommandExecutor partyAllianceCommand       = new PartyAllianceCommand();
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
@@ -171,10 +172,10 @@ public class PartyCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         switch (args.length) {
             case 1:
-                return StringUtil.copyPartialMatches(args[0], PARTY_SUBCOMMANDS, new ArrayList<String>(PARTY_SUBCOMMANDS.size()));
+                return StringUtil.copyPartialMatches(args[0], PARTY_SUBCOMMANDS, new ArrayList<>(PARTY_SUBCOMMANDS.size()));
             case 2:
                 PartySubcommandType subcommand = PartySubcommandType.getSubcommand(args[0]);
 
@@ -188,18 +189,18 @@ public class PartyCommand implements TabExecutor {
                     case KICK:
                     case OWNER:
                         List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
-                        return StringUtil.copyPartialMatches(args[1], playerNames, new ArrayList<String>(playerNames.size()));
+                        return StringUtil.copyPartialMatches(args[1], playerNames, new ArrayList<>(playerNames.size()));
                     case XPSHARE:
-                        return StringUtil.copyPartialMatches(args[1], XPSHARE_COMPLETIONS, new ArrayList<String>(XPSHARE_COMPLETIONS.size()));
+                        return StringUtil.copyPartialMatches(args[1], XPSHARE_COMPLETIONS, new ArrayList<>(XPSHARE_COMPLETIONS.size()));
                     case ITEMSHARE:
-                        return StringUtil.copyPartialMatches(args[1], ITEMSHARE_COMPLETIONS, new ArrayList<String>(ITEMSHARE_COMPLETIONS.size()));
+                        return StringUtil.copyPartialMatches(args[1], ITEMSHARE_COMPLETIONS, new ArrayList<>(ITEMSHARE_COMPLETIONS.size()));
                     case LOCK:
                     case CHAT:
-                        return StringUtil.copyPartialMatches(args[1], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<String>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
+                        return StringUtil.copyPartialMatches(args[1], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
                     case PASSWORD:
-                        return StringUtil.copyPartialMatches(args[1], CommandUtils.RESET_OPTIONS, new ArrayList<String>(CommandUtils.RESET_OPTIONS.size()));
+                        return StringUtil.copyPartialMatches(args[1], CommandUtils.RESET_OPTIONS, new ArrayList<>(CommandUtils.RESET_OPTIONS.size()));
                     case TELEPORT:
-                        List<String> matches = StringUtil.copyPartialMatches(args[1], PtpCommand.TELEPORT_SUBCOMMANDS, new ArrayList<String>(PtpCommand.TELEPORT_SUBCOMMANDS.size()));
+                        List<String> matches = StringUtil.copyPartialMatches(args[1], PtpCommand.TELEPORT_SUBCOMMANDS, new ArrayList<>(PtpCommand.TELEPORT_SUBCOMMANDS.size()));
 
                         if (matches.size() == 0) {
                             Player player = (Player) sender;
@@ -214,7 +215,7 @@ public class PartyCommand implements TabExecutor {
                             Party party = UserManager.getPlayer(player).getParty();
 
                             playerNames = party.getOnlinePlayerNames(player);
-                            return StringUtil.copyPartialMatches(args[1], playerNames, new ArrayList<String>(playerNames.size()));
+                            return StringUtil.copyPartialMatches(args[1], playerNames, new ArrayList<>(playerNames.size()));
                         }
 
                         return matches;
@@ -223,7 +224,7 @@ public class PartyCommand implements TabExecutor {
                 }
             case 3:
                 if (PartySubcommandType.getSubcommand(args[0]) == PartySubcommandType.ITEMSHARE && isItemShareCategory(args[1])) {
-                    return StringUtil.copyPartialMatches(args[2], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<String>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
+                    return StringUtil.copyPartialMatches(args[2], CommandUtils.TRUE_FALSE_OPTIONS, new ArrayList<>(CommandUtils.TRUE_FALSE_OPTIONS.size()));
                 }
 
                 return ImmutableList.of();

src/main/java/com/gmail/nossr50/commands/party/PartyCreateCommand.java

@@ -8,10 +8,11 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyCreateCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 2:
             case 3:

src/main/java/com/gmail/nossr50/commands/party/PartyDisbandCommand.java

@@ -9,35 +9,32 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyDisbandCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 1:
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 1) {
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+                return true;
+            }
+
+            Party playerParty = UserManager.getPlayer((Player) sender).getParty();
+            String partyName = playerParty.getName();
+
+            for (Player member : playerParty.getOnlineMembers()) {
+                if (!PartyManager.handlePartyChangeEvent(member, partyName, null, EventReason.KICKED_FROM_PARTY)) {
                     return true;
                 }
 
-                Party playerParty = UserManager.getPlayer((Player) sender).getParty();
-                String partyName = playerParty.getName();
+                member.sendMessage(LocaleLoader.getString("Party.Disband"));
+            }
 
-                for (Player member : playerParty.getOnlineMembers()) {
-                    if (!PartyManager.handlePartyChangeEvent(member, partyName, null, EventReason.KICKED_FROM_PARTY)) {
-                        return true;
-                    }
-
-                    member.sendMessage(LocaleLoader.getString("Party.Disband"));
-                }
-
-                PartyManager.disbandParty(playerParty);
-                return true;
-
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.1", "party", "disband"));
-                return true;
+            PartyManager.disbandParty(playerParty);
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.1", "party", "disband"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/PartyHelpCommand.java

@@ -4,27 +4,25 @@ import com.gmail.nossr50.locale.LocaleLoader;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyHelpCommand implements CommandExecutor {
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 1:
-                sender.sendMessage(LocaleLoader.getString("Party.Help.3", "/party join", "/party quit"));
-                sender.sendMessage(LocaleLoader.getString("Party.Help.1", "/party create"));
-                sender.sendMessage(LocaleLoader.getString("Party.Help.4", "/party <lock|unlock>"));
-                sender.sendMessage(LocaleLoader.getString("Party.Help.5", "/party password"));
-                sender.sendMessage(LocaleLoader.getString("Party.Help.6", "/party kick"));
-                sender.sendMessage(LocaleLoader.getString("Party.Help.7", "/party leader"));
-                sender.sendMessage(LocaleLoader.getString("Party.Help.8", "/party disband"));
-                sender.sendMessage(LocaleLoader.getString("Party.Help.9", "/party itemshare"));
-                sender.sendMessage(LocaleLoader.getString("Party.Help.10", "/party xpshare"));
-                return true;
-
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.1", "party", "help"));
-                return true;
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 1) {
+            sender.sendMessage(LocaleLoader.getString("Party.Help.3", "/party join", "/party quit"));
+            sender.sendMessage(LocaleLoader.getString("Party.Help.1", "/party create"));
+            sender.sendMessage(LocaleLoader.getString("Party.Help.4", "/party <lock|unlock>"));
+            sender.sendMessage(LocaleLoader.getString("Party.Help.5", "/party password"));
+            sender.sendMessage(LocaleLoader.getString("Party.Help.6", "/party kick"));
+            sender.sendMessage(LocaleLoader.getString("Party.Help.7", "/party leader"));
+            sender.sendMessage(LocaleLoader.getString("Party.Help.8", "/party disband"));
+            sender.sendMessage(LocaleLoader.getString("Party.Help.9", "/party itemshare"));
+            sender.sendMessage(LocaleLoader.getString("Party.Help.10", "/party xpshare"));
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.1", "party", "help"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/PartyInfoCommand.java

@@ -13,13 +13,14 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public class PartyInfoCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 0:
             case 1:
@@ -60,8 +61,8 @@ public class PartyInfoCommand implements CommandExecutor {
     private void displayPartyFeatures(Player player, Party party) {
         player.sendMessage(LocaleLoader.getString("Commands.Party.Features.Header"));
 
-        List<String> unlockedPartyFeatures = new ArrayList<String>();
-        List<String> lockedPartyFeatures = new ArrayList<String>();
+        List<String> unlockedPartyFeatures = new ArrayList<>();
+        List<String> lockedPartyFeatures = new ArrayList<>();
 
         for (PartyFeature partyFeature : PartyFeature.values()) {
             if (!partyFeature.hasPermission(player)) {

src/main/java/com/gmail/nossr50/commands/party/PartyInviteCommand.java

@@ -11,64 +11,60 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyInviteCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                String targetName = CommandUtils.getMatchedPlayerName(args[1]);
-                McMMOPlayer mcMMOTarget = UserManager.getOfflinePlayer(targetName);
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {
+            String targetName = CommandUtils.getMatchedPlayerName(args[1]);
+            McMMOPlayer mcMMOTarget = UserManager.getOfflinePlayer(targetName);
 
-                if (!CommandUtils.checkPlayerExistence(sender, targetName, mcMMOTarget)) {
-                    return false;
-                }
+            if (!CommandUtils.checkPlayerExistence(sender, targetName, mcMMOTarget)) {
+                return false;
+            }
 
-                Player target = mcMMOTarget.getPlayer();
+            Player target = mcMMOTarget.getPlayer();
 
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                    return true;
-                }
-
-                Player player = (Player) sender;
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
-                String playerName = player.getName();
-
-                if (player.equals(target)) {
-                    sender.sendMessage(LocaleLoader.getString("Party.Invite.Self"));
-                    return true;
-                }
-
-                if (PartyManager.inSameParty(player, target)) {
-                    sender.sendMessage(LocaleLoader.getString("Party.Player.InSameParty", targetName));
-                    return true;
-                }
-
-                if (!PartyManager.canInvite(mcMMOPlayer)) {
-                    player.sendMessage(LocaleLoader.getString("Party.Locked"));
-                    return true;
-                }
-
-                Party playerParty = mcMMOPlayer.getParty();
-
-                if(PartyManager.isPartyFull(target, playerParty))
-                {
-                    player.sendMessage(LocaleLoader.getString("Commands.Party.PartyFull.Invite", target.getName(), playerParty.toString(), Config.getInstance().getPartyMaxSize()));
-                    return true;
-                }
-
-                mcMMOTarget.setPartyInvite(playerParty);
-
-                sender.sendMessage(LocaleLoader.getString("Commands.Invite.Success"));
-                target.sendMessage(LocaleLoader.getString("Commands.Party.Invite.0", playerParty.getName(), playerName));
-                target.sendMessage(LocaleLoader.getString("Commands.Party.Invite.1"));
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
                 return true;
+            }
 
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "invite", "<" + LocaleLoader.getString("Commands.Usage.Player") + ">"));
+            Player player = (Player) sender;
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+            String playerName = player.getName();
+
+            if (player.equals(target)) {
+                sender.sendMessage(LocaleLoader.getString("Party.Invite.Self"));
                 return true;
+            }
+
+            if (PartyManager.inSameParty(player, target)) {
+                sender.sendMessage(LocaleLoader.getString("Party.Player.InSameParty", targetName));
+                return true;
+            }
+
+            if (!PartyManager.canInvite(mcMMOPlayer)) {
+                player.sendMessage(LocaleLoader.getString("Party.Locked"));
+                return true;
+            }
+
+            Party playerParty = mcMMOPlayer.getParty();
+
+            if (PartyManager.isPartyFull(target, playerParty)) {
+                player.sendMessage(LocaleLoader.getString("Commands.Party.PartyFull.Invite", target.getName(), playerParty.toString(), Config.getInstance().getPartyMaxSize()));
+                return true;
+            }
+
+            mcMMOTarget.setPartyInvite(playerParty);
+
+            sender.sendMessage(LocaleLoader.getString("Commands.Invite.Success"));
+            target.sendMessage(LocaleLoader.getString("Commands.Party.Invite.0", playerParty.getName(), playerName));
+            target.sendMessage(LocaleLoader.getString("Commands.Party.Invite.1"));
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "invite", "<" + LocaleLoader.getString("Commands.Usage.Player") + ">"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/PartyItemShareCommand.java

@@ -13,12 +13,13 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.Locale;
 
 public class PartyItemShareCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if(UserManager.getPlayer((Player) sender) == null)
         {
             sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));

src/main/java/com/gmail/nossr50/commands/party/PartyJoinCommand.java

@@ -10,10 +10,11 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyJoinCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 2:
             case 3:

src/main/java/com/gmail/nossr50/commands/party/PartyKickCommand.java

@@ -12,46 +12,43 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyKickCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+                return true;
+            }
+
+            Party playerParty = UserManager.getPlayer((Player) sender).getParty();
+            String targetName = CommandUtils.getMatchedPlayerName(args[1]);
+
+            if (!playerParty.hasMember(targetName)) {
+                sender.sendMessage(LocaleLoader.getString("Party.NotInYourParty", targetName));
+                return true;
+            }
+
+            OfflinePlayer target = mcMMO.p.getServer().getOfflinePlayer(targetName);
+
+            if (target.isOnline()) {
+                Player onlineTarget = target.getPlayer();
+                String partyName = playerParty.getName();
+
+                if (!PartyManager.handlePartyChangeEvent(onlineTarget, partyName, null, EventReason.KICKED_FROM_PARTY)) {
                     return true;
                 }
 
-                Party playerParty = UserManager.getPlayer((Player) sender).getParty();
-                String targetName = CommandUtils.getMatchedPlayerName(args[1]);
+                PartyManager.processPartyLeaving(UserManager.getPlayer(onlineTarget));
+                onlineTarget.sendMessage(LocaleLoader.getString("Commands.Party.Kick", partyName));
+            }
 
-                if (!playerParty.hasMember(targetName)) {
-                    sender.sendMessage(LocaleLoader.getString("Party.NotInYourParty", targetName));
-                    return true;
-                }
-
-                OfflinePlayer target = mcMMO.p.getServer().getOfflinePlayer(targetName);
-
-                if (target.isOnline()) {
-                    Player onlineTarget = target.getPlayer();
-                    String partyName = playerParty.getName();
-
-                    if (!PartyManager.handlePartyChangeEvent(onlineTarget, partyName, null, EventReason.KICKED_FROM_PARTY)) {
-                        return true;
-                    }
-
-                    PartyManager.processPartyLeaving(UserManager.getPlayer(onlineTarget));
-                    onlineTarget.sendMessage(LocaleLoader.getString("Commands.Party.Kick", partyName));
-                }
-
-                PartyManager.removeFromParty(target, playerParty);
-                return true;
-
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "kick", "<" + LocaleLoader.getString("Commands.Usage.Player") + ">"));
-                return true;
+            PartyManager.removeFromParty(target, playerParty);
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "kick", "<" + LocaleLoader.getString("Commands.Usage.Player") + ">"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/PartyLockCommand.java

@@ -9,10 +9,11 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyLockCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 1:
                 if (args[0].equalsIgnoreCase("lock")) {
@@ -67,7 +68,7 @@ public class PartyLockCommand implements CommandExecutor {
             return;
         }
 
-        if (lock ? party.isLocked() : !party.isLocked()) {
+        if (lock == party.isLocked()) {
             sender.sendMessage(LocaleLoader.getString("Party." + (lock ? "IsLocked" : "IsntLocked")));
             return;
         }

src/main/java/com/gmail/nossr50/commands/party/PartyQuitCommand.java

@@ -10,34 +10,31 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyQuitCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 1:
-                Player player = (Player) sender;
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 1) {
+            Player player = (Player) sender;
 
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                    return true;
-                }
-
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
-                Party playerParty = mcMMOPlayer.getParty();
-
-                if (!PartyManager.handlePartyChangeEvent(player, playerParty.getName(), null, EventReason.LEFT_PARTY)) {
-                    return true;
-                }
-
-                PartyManager.removeFromParty(mcMMOPlayer);
-                sender.sendMessage(LocaleLoader.getString("Commands.Party.Leave"));
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
                 return true;
+            }
 
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.1", "party", "quit"));
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+            Party playerParty = mcMMOPlayer.getParty();
+
+            if (!PartyManager.handlePartyChangeEvent(player, playerParty.getName(), null, EventReason.LEFT_PARTY)) {
                 return true;
+            }
+
+            PartyManager.removeFromParty(mcMMOPlayer);
+            sender.sendMessage(LocaleLoader.getString("Commands.Party.Leave"));
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.1", "party", "quit"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/PartyRenameCommand.java

@@ -10,57 +10,54 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyRenameCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                    return true;
-                }
-
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer((Player) sender);
-                Party playerParty = mcMMOPlayer.getParty();
-
-                String oldPartyName = playerParty.getName();
-                String newPartyName = args[1];
-
-                // This is to prevent party leaders from spamming other players with the rename message
-                if (oldPartyName.equalsIgnoreCase(newPartyName)) {
-                    sender.sendMessage(LocaleLoader.getString("Party.Rename.Same"));
-                    return true;
-                }
-
-                Player player = mcMMOPlayer.getPlayer();
-
-                // Check to see if the party exists, and if it does cancel renaming the party
-                if (PartyManager.checkPartyExistence(player, newPartyName)) {
-                    return true;
-                }
-
-                String leaderName = playerParty.getLeader().getPlayerName();
-
-                for (Player member : playerParty.getOnlineMembers()) {
-                    if (!PartyManager.handlePartyChangeEvent(member, oldPartyName, newPartyName, EventReason.CHANGED_PARTIES)) {
-                        return true;
-                    }
-
-                    if (!member.getName().equalsIgnoreCase(leaderName)) {
-                        member.sendMessage(LocaleLoader.getString("Party.InformedOnNameChange", leaderName, newPartyName));
-                    }
-                }
-
-                playerParty.setName(newPartyName);
-
-                sender.sendMessage(LocaleLoader.getString("Commands.Party.Rename", newPartyName));
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
                 return true;
+            }
 
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "rename", "<" + LocaleLoader.getString("Commands.Usage.PartyName") + ">"));
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer((Player) sender);
+            Party playerParty = mcMMOPlayer.getParty();
+
+            String oldPartyName = playerParty.getName();
+            String newPartyName = args[1];
+
+            // This is to prevent party leaders from spamming other players with the rename message
+            if (oldPartyName.equalsIgnoreCase(newPartyName)) {
+                sender.sendMessage(LocaleLoader.getString("Party.Rename.Same"));
                 return true;
+            }
+
+            Player player = mcMMOPlayer.getPlayer();
+
+            // Check to see if the party exists, and if it does cancel renaming the party
+            if (PartyManager.checkPartyExistence(player, newPartyName)) {
+                return true;
+            }
+
+            String leaderName = playerParty.getLeader().getPlayerName();
+
+            for (Player member : playerParty.getOnlineMembers()) {
+                if (!PartyManager.handlePartyChangeEvent(member, oldPartyName, newPartyName, EventReason.CHANGED_PARTIES)) {
+                    return true;
+                }
+
+                if (!member.getName().equalsIgnoreCase(leaderName)) {
+                    member.sendMessage(LocaleLoader.getString("Party.InformedOnNameChange", leaderName, newPartyName));
+                }
+            }
+
+            playerParty.setName(newPartyName);
+
+            sender.sendMessage(LocaleLoader.getString("Commands.Party.Rename", newPartyName));
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "rename", "<" + LocaleLoader.getString("Commands.Usage.PartyName") + ">"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/PartyXpShareCommand.java

@@ -12,10 +12,11 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyXpShareCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if(UserManager.getPlayer((Player) sender) == null)
         {
             sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
@@ -29,24 +30,19 @@ public class PartyXpShareCommand implements CommandExecutor {
             return true;
         }
 
-        switch (args.length) {
-            case 2:
-                if (args[1].equalsIgnoreCase("none") || CommandUtils.shouldDisableToggle(args[1])) {
-                    handleChangingShareMode(party, ShareMode.NONE);
-                }
-                else if (args[1].equalsIgnoreCase("equal") || args[1].equalsIgnoreCase("even") || CommandUtils.shouldEnableToggle(args[1])) {
-                    handleChangingShareMode(party, ShareMode.EQUAL);
-                }
-                else {
-                    sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "xpshare", "<NONE | EQUAL>"));
-                }
-
-                return true;
-
-            default:
+        if (args.length == 2) {
+            if (args[1].equalsIgnoreCase("none") || CommandUtils.shouldDisableToggle(args[1])) {
+                handleChangingShareMode(party, ShareMode.NONE);
+            } else if (args[1].equalsIgnoreCase("equal") || args[1].equalsIgnoreCase("even") || CommandUtils.shouldEnableToggle(args[1])) {
+                handleChangingShareMode(party, ShareMode.EQUAL);
+            } else {
                 sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "xpshare", "<NONE | EQUAL>"));
-                return true;
+            }
+
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "xpshare", "<NONE | EQUAL>"));
+        return true;
     }
 
     private void handleChangingShareMode(Party party, ShareMode mode) {

src/main/java/com/gmail/nossr50/commands/party/alliance/PartyAllianceAcceptCommand.java

@@ -8,36 +8,33 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyAllianceAcceptCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                    return true;
-                }
-                Player player = (Player) sender;
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
-
-                if (!mcMMOPlayer.hasPartyAllianceInvite()) {
-                    sender.sendMessage(LocaleLoader.getString("mcMMO.NoInvites"));
-                    return true;
-                }
-
-                if (mcMMOPlayer.getParty().getAlly() != null) {
-                    player.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.AlreadyAllies"));
-                    return true;
-                }
-
-                PartyManager.acceptAllianceInvite(mcMMOPlayer);
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
                 return true;
+            }
+            Player player = (Player) sender;
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
 
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "alliance", "accept"));
+            if (!mcMMOPlayer.hasPartyAllianceInvite()) {
+                sender.sendMessage(LocaleLoader.getString("mcMMO.NoInvites"));
                 return true;
+            }
+
+            if (mcMMOPlayer.getParty().getAlly() != null) {
+                player.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.AlreadyAllies"));
+                return true;
+            }
+
+            PartyManager.acceptAllianceInvite(mcMMOPlayer);
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "alliance", "accept"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/alliance/PartyAllianceCommand.java

@@ -16,6 +16,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -27,12 +28,12 @@ public class PartyAllianceCommand implements TabExecutor {
 
     public static final List<String> ALLIANCE_SUBCOMMANDS = ImmutableList.of("invite", "accept", "disband");
 
-    private CommandExecutor partyAllianceInviteCommand = new PartyAllianceInviteCommand();
-    private CommandExecutor partyAllianceAcceptCommand = new PartyAllianceAcceptCommand();
-    private CommandExecutor partyAllianceDisbandCommand = new PartyAllianceDisbandCommand();
+    private final CommandExecutor partyAllianceInviteCommand = new PartyAllianceInviteCommand();
+    private final CommandExecutor partyAllianceAcceptCommand = new PartyAllianceAcceptCommand();
+    private final CommandExecutor partyAllianceDisbandCommand = new PartyAllianceDisbandCommand();
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
@@ -108,20 +109,18 @@ public class PartyAllianceCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender commandSender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 1:
-                List<String> matches = StringUtil.copyPartialMatches(args[0], ALLIANCE_SUBCOMMANDS, new ArrayList<String>(ALLIANCE_SUBCOMMANDS.size()));
+    public List<String> onTabComplete(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 1) {
+            List<String> matches = StringUtil.copyPartialMatches(args[0], ALLIANCE_SUBCOMMANDS, new ArrayList<>(ALLIANCE_SUBCOMMANDS.size()));
 
-                if (matches.size() == 0) {
-                    List<String> playerNames = CommandUtils.getOnlinePlayerNames(commandSender);
-                    return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
-                }
+            if (matches.size() == 0) {
+                List<String> playerNames = CommandUtils.getOnlinePlayerNames(commandSender);
+                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<>(playerNames.size()));
+            }
 
-                return matches;
-            default:
-                return ImmutableList.of();
+            return matches;
         }
+        return ImmutableList.of();
     }
 
     private void displayPartyHeader() {

src/main/java/com/gmail/nossr50/commands/party/alliance/PartyAllianceDisbandCommand.java

@@ -9,32 +9,29 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyAllianceDisbandCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 2:
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                    return true;
-                }
-                Player player = (Player) sender;
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
-                Party party = mcMMOPlayer.getParty();
-
-                if (party.getAlly() == null) {
-                    sender.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.None"));
-                    return true;
-                }
-
-                PartyManager.disbandAlliance(player, party, party.getAlly());
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 2) {
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
                 return true;
+            }
+            Player player = (Player) sender;
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+            Party party = mcMMOPlayer.getParty();
 
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "alliance", "disband"));
+            if (party.getAlly() == null) {
+                sender.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.None"));
                 return true;
+            }
+
+            PartyManager.disbandAlliance(player, party, party.getAlly());
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.2", "party", "alliance", "disband"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/alliance/PartyAllianceInviteCommand.java

@@ -10,68 +10,65 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PartyAllianceInviteCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 3:
-                String targetName = CommandUtils.getMatchedPlayerName(args[2]);
-                McMMOPlayer mcMMOTarget = UserManager.getOfflinePlayer(targetName);
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 3) {
+            String targetName = CommandUtils.getMatchedPlayerName(args[2]);
+            McMMOPlayer mcMMOTarget = UserManager.getOfflinePlayer(targetName);
 
-                if (!CommandUtils.checkPlayerExistence(sender, targetName, mcMMOTarget)) {
-                    return false;
-                }
+            if (!CommandUtils.checkPlayerExistence(sender, targetName, mcMMOTarget)) {
+                return false;
+            }
 
-                Player target = mcMMOTarget.getPlayer();
+            Player target = mcMMOTarget.getPlayer();
 
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                    return true;
-                }
-
-                Player player = (Player) sender;
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
-                String playerName = player.getName();
-
-                if (player.equals(target)) {
-                    sender.sendMessage(LocaleLoader.getString("Party.Invite.Self"));
-                    return true;
-                }
-
-                if (!mcMMOTarget.inParty()) {
-                    player.sendMessage(LocaleLoader.getString("Party.PlayerNotInParty", targetName));
-                    return true;
-                }
-
-                if (PartyManager.inSameParty(player, target)) {
-                    sender.sendMessage(LocaleLoader.getString("Party.Player.InSameParty", targetName));
-                    return true;
-                }
-
-                if (!mcMMOTarget.getParty().getLeader().getUniqueId().equals(target.getUniqueId())) {
-                    player.sendMessage(LocaleLoader.getString("Party.Target.NotOwner", targetName));
-                    return true;
-                }
-
-                Party playerParty = mcMMOPlayer.getParty();
-
-                if (playerParty.getAlly() != null) {
-                    player.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.AlreadyAllies"));
-                    return true;
-                }
-
-                mcMMOTarget.setPartyAllianceInvite(playerParty);
-
-                sender.sendMessage(LocaleLoader.getString("Commands.Invite.Success"));
-                target.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.Invite.0", playerParty.getName(), playerName));
-                target.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.Invite.1"));
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
                 return true;
+            }
 
-            default:
-                sender.sendMessage(LocaleLoader.getString("Commands.Usage.3", "party", "alliance", "invite", "<" + LocaleLoader.getString("Commands.Usage.Player") + ">"));
+            Player player = (Player) sender;
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+            String playerName = player.getName();
+
+            if (player.equals(target)) {
+                sender.sendMessage(LocaleLoader.getString("Party.Invite.Self"));
                 return true;
+            }
+
+            if (!mcMMOTarget.inParty()) {
+                player.sendMessage(LocaleLoader.getString("Party.PlayerNotInParty", targetName));
+                return true;
+            }
+
+            if (PartyManager.inSameParty(player, target)) {
+                sender.sendMessage(LocaleLoader.getString("Party.Player.InSameParty", targetName));
+                return true;
+            }
+
+            if (!mcMMOTarget.getParty().getLeader().getUniqueId().equals(target.getUniqueId())) {
+                player.sendMessage(LocaleLoader.getString("Party.Target.NotOwner", targetName));
+                return true;
+            }
+
+            Party playerParty = mcMMOPlayer.getParty();
+
+            if (playerParty.getAlly() != null) {
+                player.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.AlreadyAllies"));
+                return true;
+            }
+
+            mcMMOTarget.setPartyAllianceInvite(playerParty);
+
+            sender.sendMessage(LocaleLoader.getString("Commands.Invite.Success"));
+            target.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.Invite.0", playerParty.getName(), playerName));
+            target.sendMessage(LocaleLoader.getString("Commands.Party.Alliance.Invite.1"));
+            return true;
         }
+        sender.sendMessage(LocaleLoader.getString("Commands.Usage.3", "party", "alliance", "invite", "<" + LocaleLoader.getString("Commands.Usage.Player") + ">"));
+        return true;
     }
 }

src/main/java/com/gmail/nossr50/commands/party/teleport/PtpAcceptAnyCommand.java

@@ -7,10 +7,11 @@ import com.gmail.nossr50.util.player.UserManager;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
 
 public class PtpAcceptAnyCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (!Permissions.partyTeleportAcceptAll(sender)) {
             sender.sendMessage(command.getPermissionMessage());
             return true;

src/main/java/com/gmail/nossr50/commands/party/teleport/PtpAcceptCommand.java

@@ -11,10 +11,11 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 public class PtpAcceptCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (!Permissions.partyTeleportAccept(sender)) {
             sender.sendMessage(command.getPermissionMessage());
             return true;

src/main/java/com/gmail/nossr50/commands/party/teleport/PtpCommand.java

@@ -26,6 +26,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -33,12 +34,12 @@ import java.util.List;
 public class PtpCommand implements TabExecutor {
     public static final List<String> TELEPORT_SUBCOMMANDS = ImmutableList.of("toggle", "accept", "acceptany", "acceptall");
 
-    private CommandExecutor ptpToggleCommand = new PtpToggleCommand();
-    private CommandExecutor ptpAcceptAnyCommand = new PtpAcceptAnyCommand();
-    private CommandExecutor ptpAcceptCommand = new PtpAcceptCommand();
+    private final CommandExecutor ptpToggleCommand = new PtpToggleCommand();
+    private final CommandExecutor ptpAcceptAnyCommand = new PtpAcceptAnyCommand();
+    private final CommandExecutor ptpAcceptCommand = new PtpAcceptCommand();
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
@@ -80,85 +81,79 @@ public class PtpCommand implements TabExecutor {
             return true;
         }
 
-        switch (args.length) {
-            case 1:
-                if (args[0].equalsIgnoreCase("toggle")) {
-                    return ptpToggleCommand.onCommand(sender, command, label, args);
-                }
+        if (args.length == 1) {
+            if (args[0].equalsIgnoreCase("toggle")) {
+                return ptpToggleCommand.onCommand(sender, command, label, args);
+            }
 
-                if (args[0].equalsIgnoreCase("acceptany") || args[0].equalsIgnoreCase("acceptall")) {
-                    return ptpAcceptAnyCommand.onCommand(sender, command, label, args);
-                }
+            if (args[0].equalsIgnoreCase("acceptany") || args[0].equalsIgnoreCase("acceptall")) {
+                return ptpAcceptAnyCommand.onCommand(sender, command, label, args);
+            }
 
-                long recentlyHurt = mcMMOPlayer.getRecentlyHurt();
-                int hurtCooldown = Config.getInstance().getPTPCommandRecentlyHurtCooldown();
+            long recentlyHurt = mcMMOPlayer.getRecentlyHurt();
+            int hurtCooldown = Config.getInstance().getPTPCommandRecentlyHurtCooldown();
 
-                if (hurtCooldown > 0) {
-                    int timeRemaining = SkillUtils.calculateTimeLeft(recentlyHurt * Misc.TIME_CONVERSION_FACTOR, hurtCooldown, player);
+            if (hurtCooldown > 0) {
+                int timeRemaining = SkillUtils.calculateTimeLeft(recentlyHurt * Misc.TIME_CONVERSION_FACTOR, hurtCooldown, player);
 
-                    if (timeRemaining > 0) {
-                        player.sendMessage(LocaleLoader.getString("Item.Injured.Wait", timeRemaining));
-                        return true;
-                    }
-                }
-
-                if (args[0].equalsIgnoreCase("accept")) {
-                    return ptpAcceptCommand.onCommand(sender, command, label, args);
-                }
-
-                if (!Permissions.partyTeleportSend(sender)) {
-                    sender.sendMessage(command.getPermissionMessage());
+                if (timeRemaining > 0) {
+                    player.sendMessage(LocaleLoader.getString("Item.Injured.Wait", timeRemaining));
                     return true;
                 }
+            }
 
-                int ptpCooldown = Config.getInstance().getPTPCommandCooldown();
-                long ptpLastUse = mcMMOPlayer.getPartyTeleportRecord().getLastUse();
+            if (args[0].equalsIgnoreCase("accept")) {
+                return ptpAcceptCommand.onCommand(sender, command, label, args);
+            }
 
-                if (ptpCooldown > 0) {
-                    int timeRemaining = SkillUtils.calculateTimeLeft(ptpLastUse * Misc.TIME_CONVERSION_FACTOR, ptpCooldown, player);
-
-                    if (timeRemaining > 0) {
-                        player.sendMessage(LocaleLoader.getString("Item.Generic.Wait", timeRemaining));
-                        return true;
-                    }
-                }
-
-                sendTeleportRequest(sender, player, CommandUtils.getMatchedPlayerName(args[0]));
+            if (!Permissions.partyTeleportSend(sender)) {
+                sender.sendMessage(command.getPermissionMessage());
                 return true;
+            }
 
-            default:
-                return false;
+            int ptpCooldown = Config.getInstance().getPTPCommandCooldown();
+            long ptpLastUse = mcMMOPlayer.getPartyTeleportRecord().getLastUse();
+
+            if (ptpCooldown > 0) {
+                int timeRemaining = SkillUtils.calculateTimeLeft(ptpLastUse * Misc.TIME_CONVERSION_FACTOR, ptpCooldown, player);
+
+                if (timeRemaining > 0) {
+                    player.sendMessage(LocaleLoader.getString("Item.Generic.Wait", timeRemaining));
+                    return true;
+                }
+            }
+
+            sendTeleportRequest(sender, player, CommandUtils.getMatchedPlayerName(args[0]));
+            return true;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                List<String> matches = StringUtil.copyPartialMatches(args[0], TELEPORT_SUBCOMMANDS, new ArrayList<String>(TELEPORT_SUBCOMMANDS.size()));
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            List<String> matches = StringUtil.copyPartialMatches(args[0], TELEPORT_SUBCOMMANDS, new ArrayList<>(TELEPORT_SUBCOMMANDS.size()));
 
-                if (matches.size() == 0) {
-                    if(UserManager.getPlayer((Player) sender) == null)
-                    {
-                        sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
-                        return ImmutableList.of();
-                    }
-
-                    Player player = (Player) sender;
-                    McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
-
-                    if (!mcMMOPlayer.inParty()) {
-                        return ImmutableList.of();
-                    }
-
-                    List<String> playerNames = mcMMOPlayer.getParty().getOnlinePlayerNames(player);
-                    return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
+            if (matches.size() == 0) {
+                if (UserManager.getPlayer((Player) sender) == null) {
+                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+                    return ImmutableList.of();
                 }
 
-                return matches;
-            default:
-                return ImmutableList.of();
+                Player player = (Player) sender;
+                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+
+                if (!mcMMOPlayer.inParty()) {
+                    return ImmutableList.of();
+                }
+
+                List<String> playerNames = mcMMOPlayer.getParty().getOnlinePlayerNames(player);
+                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<>(playerNames.size()));
+            }
+
+            return matches;
         }
+        return ImmutableList.of();
     }
 
     private void sendTeleportRequest(CommandSender sender, Player player, String targetName) {

src/main/java/com/gmail/nossr50/commands/party/teleport/PtpToggleCommand.java

@@ -7,10 +7,11 @@ import com.gmail.nossr50.util.player.UserManager;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
 
 public class PtpToggleCommand implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (!Permissions.partyTeleportToggle(sender)) {
             sender.sendMessage(command.getPermissionMessage());
             return true;

src/main/java/com/gmail/nossr50/commands/player/InspectCommand.java

@@ -16,93 +16,87 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public class InspectCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
-        switch (args.length) {
-            case 1:
-                String playerName = CommandUtils.getMatchedPlayerName(args[0]);
-                McMMOPlayer mcMMOPlayer = UserManager.getOfflinePlayer(playerName);
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length == 1) {
+            String playerName = CommandUtils.getMatchedPlayerName(args[0]);
+            McMMOPlayer mcMMOPlayer = UserManager.getOfflinePlayer(playerName);
 
-                // If the mcMMOPlayer doesn't exist, create a temporary profile and check if it's present in the database. If it's not, abort the process.
-                if (mcMMOPlayer == null) {
-                    PlayerProfile profile = mcMMO.getDatabaseManager().loadPlayerProfile(playerName, false); // Temporary Profile
+            // If the mcMMOPlayer doesn't exist, create a temporary profile and check if it's present in the database. If it's not, abort the process.
+            if (mcMMOPlayer == null) {
+                PlayerProfile profile = mcMMO.getDatabaseManager().loadPlayerProfile(playerName, false); // Temporary Profile
 
-                    if (!CommandUtils.isLoaded(sender, profile)) {
-                        return true;
-                    }
-
-                    if (Config.getInstance().getScoreboardsEnabled() && sender instanceof Player && Config.getInstance().getInspectUseBoard()) {
-                        ScoreboardManager.enablePlayerInspectScoreboard((Player) sender, profile);
-
-                        if (!Config.getInstance().getInspectUseChat()) {
-                            return true;
-                        }
-                    }
-
-                    sender.sendMessage(LocaleLoader.getString("Inspect.OfflineStats", playerName));
-
-                    sender.sendMessage(LocaleLoader.getString("Stats.Header.Gathering"));
-                    for (PrimarySkillType skill : PrimarySkillType.GATHERING_SKILLS) {
-                        sender.sendMessage(CommandUtils.displaySkill(profile, skill));
-                    }
-
-                    sender.sendMessage(LocaleLoader.getString("Stats.Header.Combat"));
-                    for (PrimarySkillType skill : PrimarySkillType.COMBAT_SKILLS) {
-                        sender.sendMessage(CommandUtils.displaySkill(profile, skill));
-                    }
-
-                    sender.sendMessage(LocaleLoader.getString("Stats.Header.Misc"));
-                    for (PrimarySkillType skill : PrimarySkillType.MISC_SKILLS) {
-                        sender.sendMessage(CommandUtils.displaySkill(profile, skill));
-                    }
-
-                }
-                else {
-                    Player target = mcMMOPlayer.getPlayer();
-
-                    if (CommandUtils.hidden(sender, target, Permissions.inspectHidden(sender))) {
-                        sender.sendMessage(LocaleLoader.getString("Inspect.Offline"));
-                        return true;
-                    }
-                    else if (CommandUtils.tooFar(sender, target, Permissions.inspectFar(sender))) {
-                        return true;
-                    }
-
-                    if (Config.getInstance().getScoreboardsEnabled() && sender instanceof Player && Config.getInstance().getInspectUseBoard()) {
-                        ScoreboardManager.enablePlayerInspectScoreboard((Player) sender, mcMMOPlayer.getProfile());
-
-                        if (!Config.getInstance().getInspectUseChat()) {
-                            return true;
-                        }
-                    }
-
-                    sender.sendMessage(LocaleLoader.getString("Inspect.Stats", target.getName()));
-                    CommandUtils.printGatheringSkills(target, sender);
-                    CommandUtils.printCombatSkills(target, sender);
-                    CommandUtils.printMiscSkills(target, sender);
-                    sender.sendMessage(LocaleLoader.getString("Commands.PowerLevel", mcMMOPlayer.getPowerLevel()));
+                if (!CommandUtils.isLoaded(sender, profile)) {
+                    return true;
                 }
 
-                return true;
+                if (Config.getInstance().getScoreboardsEnabled() && sender instanceof Player && Config.getInstance().getInspectUseBoard()) {
+                    ScoreboardManager.enablePlayerInspectScoreboard((Player) sender, profile);
 
-            default:
-                return false;
+                    if (!Config.getInstance().getInspectUseChat()) {
+                        return true;
+                    }
+                }
+
+                sender.sendMessage(LocaleLoader.getString("Inspect.OfflineStats", playerName));
+
+                sender.sendMessage(LocaleLoader.getString("Stats.Header.Gathering"));
+                for (PrimarySkillType skill : PrimarySkillType.GATHERING_SKILLS) {
+                    sender.sendMessage(CommandUtils.displaySkill(profile, skill));
+                }
+
+                sender.sendMessage(LocaleLoader.getString("Stats.Header.Combat"));
+                for (PrimarySkillType skill : PrimarySkillType.COMBAT_SKILLS) {
+                    sender.sendMessage(CommandUtils.displaySkill(profile, skill));
+                }
+
+                sender.sendMessage(LocaleLoader.getString("Stats.Header.Misc"));
+                for (PrimarySkillType skill : PrimarySkillType.MISC_SKILLS) {
+                    sender.sendMessage(CommandUtils.displaySkill(profile, skill));
+                }
+
+            } else {
+                Player target = mcMMOPlayer.getPlayer();
+
+                if (CommandUtils.hidden(sender, target, Permissions.inspectHidden(sender))) {
+                    sender.sendMessage(LocaleLoader.getString("Inspect.Offline"));
+                    return true;
+                } else if (CommandUtils.tooFar(sender, target, Permissions.inspectFar(sender))) {
+                    return true;
+                }
+
+                if (Config.getInstance().getScoreboardsEnabled() && sender instanceof Player && Config.getInstance().getInspectUseBoard()) {
+                    ScoreboardManager.enablePlayerInspectScoreboard((Player) sender, mcMMOPlayer.getProfile());
+
+                    if (!Config.getInstance().getInspectUseChat()) {
+                        return true;
+                    }
+                }
+
+                sender.sendMessage(LocaleLoader.getString("Inspect.Stats", target.getName()));
+                CommandUtils.printGatheringSkills(target, sender);
+                CommandUtils.printCombatSkills(target, sender);
+                CommandUtils.printMiscSkills(target, sender);
+                sender.sendMessage(LocaleLoader.getString("Commands.PowerLevel", mcMMOPlayer.getPowerLevel()));
+            }
+
+            return true;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
-                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
+            return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<>(playerNames.size()));
         }
+        return ImmutableList.of();
     }
 }

src/main/java/com/gmail/nossr50/commands/player/MccooldownCommand.java

@@ -12,12 +12,13 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
 public class MccooldownCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
@@ -26,53 +27,48 @@ public class MccooldownCommand implements TabExecutor {
             return true;
         }
 
-        switch (args.length) {
-            case 0:
-                Player player = (Player) sender;
+        if (args.length == 0) {
+            Player player = (Player) sender;
 
-                if (Config.getInstance().getScoreboardsEnabled() && Config.getInstance().getCooldownUseBoard()) {
-                    ScoreboardManager.enablePlayerCooldownScoreboard(player);
+            if (Config.getInstance().getScoreboardsEnabled() && Config.getInstance().getCooldownUseBoard()) {
+                ScoreboardManager.enablePlayerCooldownScoreboard(player);
 
-                    if (!Config.getInstance().getCooldownUseChat()) {
-                        return true;
-                    }
-                }
-
-                if(UserManager.getPlayer(player) == null)
-                {
-                    player.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+                if (!Config.getInstance().getCooldownUseChat()) {
                     return true;
                 }
+            }
 
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+            if (UserManager.getPlayer(player) == null) {
+                player.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+                return true;
+            }
 
-                player.sendMessage(LocaleLoader.getString("Commands.Cooldowns.Header"));
-                player.sendMessage(LocaleLoader.getString("mcMMO.NoSkillNote"));
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
 
-                for (SuperAbilityType ability : SuperAbilityType.values()) {
-                    if (!ability.getPermissions(player)) {
-                        continue;
-                    }
+            player.sendMessage(LocaleLoader.getString("Commands.Cooldowns.Header"));
+            player.sendMessage(LocaleLoader.getString("mcMMO.NoSkillNote"));
 
-                    int seconds = mcMMOPlayer.calculateTimeRemaining(ability);
-
-                    if (seconds <= 0) {
-                        player.sendMessage(LocaleLoader.getString("Commands.Cooldowns.Row.Y", ability.getName()));
-                    }
-                    else {
-                        player.sendMessage(LocaleLoader.getString("Commands.Cooldowns.Row.N", ability.getName(), seconds));
-                    }
+            for (SuperAbilityType ability : SuperAbilityType.values()) {
+                if (!ability.getPermissions(player)) {
+                    continue;
                 }
 
-                return true;
+                int seconds = mcMMOPlayer.calculateTimeRemaining(ability);
 
-            default:
-                return false;
+                if (seconds <= 0) {
+                    player.sendMessage(LocaleLoader.getString("Commands.Cooldowns.Row.Y", ability.getLocalizedName()));
+                } else {
+                    player.sendMessage(LocaleLoader.getString("Commands.Cooldowns.Row.N", ability.getLocalizedName(), seconds));
+                }
+            }
+
+            return true;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         return ImmutableList.of();
     }
 }

src/main/java/com/gmail/nossr50/commands/player/McrankCommand.java

@@ -15,13 +15,14 @@ import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.metadata.FixedMetadataValue;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public class McrankCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 0:
                 if (CommandUtils.noConsoleUsage(sender)) {
@@ -72,14 +73,12 @@ public class McrankCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
-                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            List<String> playerNames = CommandUtils.getOnlinePlayerNames(sender);
+            return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<>(playerNames.size()));
         }
+        return ImmutableList.of();
     }
 
     private void display(CommandSender sender, String playerName) {

src/main/java/com/gmail/nossr50/commands/player/McstatsCommand.java

@@ -10,12 +10,13 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
 public class McstatsCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
@@ -24,49 +25,44 @@ public class McstatsCommand implements TabExecutor {
             return true;
         }
 
-        switch (args.length) {
-            case 0:
-                if(UserManager.getPlayer((Player) sender) == null)
-                {
-                    sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+        if (args.length == 0) {
+            if (UserManager.getPlayer((Player) sender) == null) {
+                sender.sendMessage(LocaleLoader.getString("Profile.PendingLoad"));
+                return true;
+            }
+
+            Player player = (Player) sender;
+
+            if (Config.getInstance().getStatsUseBoard() && Config.getInstance().getScoreboardsEnabled()) {
+                ScoreboardManager.enablePlayerStatsScoreboard(player);
+
+                if (!Config.getInstance().getStatsUseChat()) {
                     return true;
                 }
+            }
 
-                Player player = (Player) sender;
+            player.sendMessage(LocaleLoader.getString("Stats.Own.Stats"));
+            player.sendMessage(LocaleLoader.getString("mcMMO.NoSkillNote"));
 
-                if (Config.getInstance().getStatsUseBoard() && Config.getInstance().getScoreboardsEnabled()) {
-                    ScoreboardManager.enablePlayerStatsScoreboard(player);
+            CommandUtils.printGatheringSkills(player);
+            CommandUtils.printCombatSkills(player);
+            CommandUtils.printMiscSkills(player);
 
-                    if (!Config.getInstance().getStatsUseChat()) {
-                        return true;
-                    }
-                }
+            int powerLevelCap = Config.getInstance().getPowerLevelCap();
 
-                player.sendMessage(LocaleLoader.getString("Stats.Own.Stats"));
-                player.sendMessage(LocaleLoader.getString("mcMMO.NoSkillNote"));
+            if (powerLevelCap != Integer.MAX_VALUE) {
+                player.sendMessage(LocaleLoader.getString("Commands.PowerLevel.Capped", UserManager.getPlayer(player).getPowerLevel(), powerLevelCap));
+            } else {
+                player.sendMessage(LocaleLoader.getString("Commands.PowerLevel", UserManager.getPlayer(player).getPowerLevel()));
+            }
 
-                CommandUtils.printGatheringSkills(player);
-                CommandUtils.printCombatSkills(player);
-                CommandUtils.printMiscSkills(player);
-
-                int powerLevelCap = Config.getInstance().getPowerLevelCap();
-
-                if (powerLevelCap != Integer.MAX_VALUE) {
-                    player.sendMessage(LocaleLoader.getString("Commands.PowerLevel.Capped", UserManager.getPlayer(player).getPowerLevel(), powerLevelCap));
-                }
-                else {
-                    player.sendMessage(LocaleLoader.getString("Commands.PowerLevel", UserManager.getPlayer(player).getPowerLevel()));
-                }
-
-                return true;
-
-            default:
-                return false;
+            return true;
         }
+        return false;
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
         return ImmutableList.of();
     }
 }

src/main/java/com/gmail/nossr50/commands/player/MctopCommand.java

@@ -17,13 +17,14 @@ import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.metadata.FixedMetadataValue;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public class MctopCommand implements TabExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         PrimarySkillType skill = null;
 
         switch (args.length) {
@@ -66,13 +67,11 @@ public class MctopCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                return StringUtil.copyPartialMatches(args[0], PrimarySkillType.SKILL_NAMES, new ArrayList<String>(PrimarySkillType.SKILL_NAMES.size()));
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            return StringUtil.copyPartialMatches(args[0], PrimarySkillType.SKILL_NAMES, new ArrayList<>(PrimarySkillType.SKILL_NAMES.size()));
         }
+        return ImmutableList.of();
     }
 
     private void display(int page, PrimarySkillType skill, CommandSender sender, Command command) {
@@ -90,7 +89,7 @@ public class MctopCommand implements TabExecutor {
             long cooldownMillis = Math.max(Config.getInstance().getDatabasePlayerCooldown(), 1750);
 
             if (mcMMOPlayer.getDatabaseATS() + cooldownMillis > System.currentTimeMillis()) {
-                double seconds = ((mcMMOPlayer.getDatabaseATS() + cooldownMillis) - System.currentTimeMillis()) / 1000;
+                double seconds = ((mcMMOPlayer.getDatabaseATS() + cooldownMillis) - System.currentTimeMillis()) / 1000.0D;
                 if (seconds < 1) {
                     seconds = 1;
                 }

src/main/java/com/gmail/nossr50/commands/player/XPBarCommand.java

@@ -103,7 +103,7 @@ public class XPBarCommand implements TabExecutor {
                 return StringUtil.copyPartialMatches(args[0], options, new ArrayList<>(ExperienceBarManager.XPBarSettingTarget.values().length));
             case 2:
                 if(!args[0].equalsIgnoreCase(ExperienceBarManager.XPBarSettingTarget.RESET.toString()))
-                    return StringUtil.copyPartialMatches(args[1], PrimarySkillType.SKILL_NAMES, new ArrayList<String>(PrimarySkillType.SKILL_NAMES.size()));
+                    return StringUtil.copyPartialMatches(args[1], PrimarySkillType.SKILL_NAMES, new ArrayList<>(PrimarySkillType.SKILL_NAMES.size()));
             default:
                 return ImmutableList.of();
         }

src/main/java/com/gmail/nossr50/commands/server/Mcmmoupgrade.java

@@ -3,13 +3,14 @@ package com.gmail.nossr50.commands.server;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * This command facilitates switching the skill system scale between classic and modern scale
  */
 public class Mcmmoupgrade implements CommandExecutor {
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         return false;
     }
 }

src/main/java/com/gmail/nossr50/commands/skills/AcrobaticsCommand.java

@@ -44,7 +44,7 @@ public class AcrobaticsCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canDodge) {
             messages.add(getStatMessage(SubSkillType.ACROBATICS_DODGE, dodgeChance)
@@ -71,7 +71,7 @@ public class AcrobaticsCommand extends SkillCommand {
                 graceChance      = RandomChanceUtil.getRandomChanceExecutionChance(grace_rcs);
                 //damageThreshold  = AdvancedConfig.getInstance().getRollDamageThreshold();
 
-                String rollStrings[] = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.ACROBATICS_ROLL);
+                String[] rollStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.ACROBATICS_ROLL);
 
                 //Format
                 double rollChanceLucky  = rollChance * 1.333D;

src/main/java/com/gmail/nossr50/commands/skills/AlchemyCommand.java

@@ -74,7 +74,7 @@ public class AlchemyCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canCatalysis) {
             messages.add(getStatMessage(SubSkillType.ALCHEMY_CATALYSIS, brewSpeed)

src/main/java/com/gmail/nossr50/commands/skills/AprilCommand.java

@@ -10,6 +10,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 import java.text.DecimalFormat;
 import java.util.ArrayList;
@@ -22,51 +23,48 @@ public class AprilCommand implements TabExecutor {
     protected DecimalFormat decimal = new DecimalFormat("##0.00");
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
 
         skillName = StringUtils.getCapitalized(label);
 
-        switch (args.length) {
-            case 0:
-                Player player = (Player) sender;
-                FakeSkillType fakeSkillType = FakeSkillType.getByName(skillName);
+        if (args.length == 0) {
+            Player player = (Player) sender;
+            FakeSkillType fakeSkillType = FakeSkillType.getByName(skillName);
 
-                float skillValue = Misc.getRandom().nextInt(99);
+            float skillValue = Misc.getRandom().nextInt(99);
 
-                player.sendMessage(LocaleLoader.getString("Skills.Header", skillName));
-                player.sendMessage(LocaleLoader.getString("Commands.XPGain", getXPGainString(fakeSkillType)));
-                player.sendMessage(LocaleLoader.getString("Effects.Level", (int) skillValue, Misc.getRandom().nextInt(1000), 1000 + Misc.getRandom().nextInt(1000)));
+            player.sendMessage(LocaleLoader.getString("Skills.Header", skillName));
+            player.sendMessage(LocaleLoader.getString("Commands.XPGain", getXPGainString(fakeSkillType)));
+            player.sendMessage(LocaleLoader.getString("Effects.Level", (int) skillValue, Misc.getRandom().nextInt(1000), 1000 + Misc.getRandom().nextInt(1000)));
 
 
-                List<String> effectMessages = effectsDisplay(fakeSkillType);
+            List<String> effectMessages = effectsDisplay(fakeSkillType);
 
-                if (!effectMessages.isEmpty()) {
-                    player.sendMessage(LocaleLoader.getString("Skills.Header", LocaleLoader.getString("Effects.Effects")));
+            if (!effectMessages.isEmpty()) {
+                player.sendMessage(LocaleLoader.getString("Skills.Header", LocaleLoader.getString("Effects.Effects")));
 
-                    for (String message : effectMessages) {
-                        player.sendMessage(message);
-                    }
+                for (String message : effectMessages) {
+                    player.sendMessage(message);
                 }
+            }
 
-                List<String> statsMessages = statsDisplay(fakeSkillType);
+            List<String> statsMessages = statsDisplay(fakeSkillType);
 
-                if (!statsMessages.isEmpty()) {
-                    player.sendMessage(LocaleLoader.getString("Skills.Header", LocaleLoader.getString("Commands.Stats.Self")));
+            if (!statsMessages.isEmpty()) {
+                player.sendMessage(LocaleLoader.getString("Skills.Header", LocaleLoader.getString("Commands.Stats.Self")));
 
-                    for (String message : statsMessages) {
-                        player.sendMessage(message);
-                    }
+                for (String message : statsMessages) {
+                    player.sendMessage(message);
                 }
+            }
 
-                player.sendMessage(LocaleLoader.formatString("[[DARK_AQUA]]Guide for {0} available - type /APRIL FOOLS ! :D", skillName));
-                return true;
-
-            default:
-                return true;
+            player.sendMessage(LocaleLoader.formatString("[[DARK_AQUA]]Guide for {0} available - type /APRIL FOOLS ! :D", skillName));
+            return true;
         }
+        return true;
     }
 
     private String getXPGainString(FakeSkillType fakeSkillType) {
@@ -101,17 +99,15 @@ public class AprilCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                return ImmutableList.of("?");
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            return ImmutableList.of("?");
         }
+        return ImmutableList.of();
     }
 
     private List<String> effectsDisplay(FakeSkillType fakeSkillType) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         switch (fakeSkillType) {
             case MACHO:
@@ -157,7 +153,7 @@ public class AprilCommand implements TabExecutor {
     }
 
     private List<String> statsDisplay(FakeSkillType fakeSkillType) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         switch (fakeSkillType) {
             case MACHO:

src/main/java/com/gmail/nossr50/commands/skills/ArcheryCommand.java

@@ -59,7 +59,7 @@ public class ArcheryCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canRetrieve) {
             messages.add(getStatMessage(SubSkillType.ARCHERY_ARROW_RETRIEVAL, retrieveChance)

src/main/java/com/gmail/nossr50/commands/skills/AxesCommand.java

@@ -72,7 +72,7 @@ public class AxesCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canImpact) {
             messages.add(LocaleLoader.getString("Ability.Generic.Template", LocaleLoader.getString("Axes.Ability.Bonus.2"), LocaleLoader.getString("Axes.Ability.Bonus.3", impactDamage)));

src/main/java/com/gmail/nossr50/commands/skills/ExcavationCommand.java

@@ -29,7 +29,7 @@ public class ExcavationCommand extends SkillCommand {
     protected void dataCalculations(Player player, float skillValue) {
         // GIGA DRILL BREAKER
         if (canGigaDrill) {
-            String gigaDrillStrings[] = calculateLengthDisplayValues(player, skillValue);
+            String[] gigaDrillStrings = calculateLengthDisplayValues(player, skillValue);
             gigaDrillBreakerLength = gigaDrillStrings[0];
             gigaDrillBreakerLengthEndurance = gigaDrillStrings[1];
         }
@@ -43,7 +43,7 @@ public class ExcavationCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         ExcavationManager excavationManager = UserManager.getPlayer(player).getExcavationManager();
 

src/main/java/com/gmail/nossr50/commands/skills/FishingCommand.java

@@ -128,7 +128,7 @@ public class FishingCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
         
         if (canFishermansDiet) {
             messages.add(getStatMessage(false, true, SubSkillType.FISHING_FISHERMANS_DIET, String.valueOf(fishermansDietRank)));

src/main/java/com/gmail/nossr50/commands/skills/HerbalismCommand.java

@@ -45,7 +45,7 @@ public class HerbalismCommand extends SkillCommand {
         
         // DOUBLE DROPS
         if (canDoubleDrop) {
-            String[] doubleDropStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.HERBALISM_DOUBLE_DROPS);;
+            String[] doubleDropStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.HERBALISM_DOUBLE_DROPS);
             doubleDropChance = doubleDropStrings[0];
             doubleDropChanceLucky = doubleDropStrings[1];
         }
@@ -99,7 +99,7 @@ public class HerbalismCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canDoubleDrop) {
             messages.add(getStatMessage(SubSkillType.HERBALISM_DOUBLE_DROPS, doubleDropChance)

src/main/java/com/gmail/nossr50/commands/skills/MiningCommand.java

@@ -78,7 +78,7 @@ public class MiningCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canBiggerBombs) {
             messages.add(getStatMessage(true, true, SubSkillType.MINING_BLAST_MINING, String.valueOf(blastRadiusIncrease)));

src/main/java/com/gmail/nossr50/commands/skills/MmoInfoCommand.java

@@ -13,6 +13,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -23,7 +24,7 @@ import java.util.List;
 public class MmoInfoCommand implements TabExecutor {
 
     @Override
-    public boolean onCommand(CommandSender commandSender, Command command, String s, String[] args) {
+    public boolean onCommand(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String s, String[] args) {
         /*
          * Only allow players to use this command
          */
@@ -61,13 +62,11 @@ public class MmoInfoCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                return StringUtil.copyPartialMatches(args[0], PrimarySkillType.SUBSKILL_NAMES, new ArrayList<String>(PrimarySkillType.SUBSKILL_NAMES.size()));
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            return StringUtil.copyPartialMatches(args[0], PrimarySkillType.SUBSKILL_NAMES, new ArrayList<>(PrimarySkillType.SUBSKILL_NAMES.size()));
         }
+        return ImmutableList.of();
     }
 
     private void displayInfo(Player player, String subSkillName)

src/main/java/com/gmail/nossr50/commands/skills/RepairCommand.java

@@ -91,7 +91,7 @@ public class RepairCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canArcaneForge) {
             RepairManager repairManager = UserManager.getPlayer(player).getRepairManager();

src/main/java/com/gmail/nossr50/commands/skills/SalvageCommand.java

@@ -36,7 +36,7 @@ public class SalvageCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
         SalvageManager salvageManager = UserManager.getPlayer(player).getSalvageManager();
 
         if (canScrapCollector) {

src/main/java/com/gmail/nossr50/commands/skills/SkillCommand.java

@@ -26,6 +26,7 @@ import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabExecutor;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 import java.text.DecimalFormat;
 import java.util.ArrayList;
@@ -35,12 +36,12 @@ import java.util.Set;
 
 public abstract class SkillCommand implements TabExecutor {
     protected PrimarySkillType skill;
-    private String skillName;
+    private final String skillName;
 
     protected DecimalFormat percent = new DecimalFormat("##0.00%");
     protected DecimalFormat decimal = new DecimalFormat("##0.00");
 
-    private CommandExecutor skillGuideCommand;
+    private final CommandExecutor skillGuideCommand;
 
     public SkillCommand(PrimarySkillType skill) {
         this.skill = skill;
@@ -49,7 +50,7 @@ public abstract class SkillCommand implements TabExecutor {
     }
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         if (CommandUtils.noConsoleUsage(sender)) {
             return true;
         }
@@ -64,64 +65,60 @@ public abstract class SkillCommand implements TabExecutor {
             return true;
         }
 
-        switch (args.length) {
-            case 0:
-                Player player = (Player) sender;
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+        if (args.length == 0) {
+            Player player = (Player) sender;
+            McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
 
-                boolean isLucky = Permissions.lucky(player, skill);
-                boolean hasEndurance = (PerksUtils.handleActivationPerks(player, 0, 0) != 0);
-                float skillValue = mcMMOPlayer.getSkillLevel(skill);
+            boolean isLucky = Permissions.lucky(player, skill);
+            boolean hasEndurance = (PerksUtils.handleActivationPerks(player, 0, 0) != 0);
+            float skillValue = mcMMOPlayer.getSkillLevel(skill);
 
-                //Send the players a few blank lines to make finding the top of the skill command easier
-                if(AdvancedConfig.getInstance().doesSkillCommandSendBlankLines())
-                    for(int i = 0; i < 2; i++)
-                    {
-                        player.sendMessage("");
-                    }
+            //Send the players a few blank lines to make finding the top of the skill command easier
+            if (AdvancedConfig.getInstance().doesSkillCommandSendBlankLines())
+                for (int i = 0; i < 2; i++) {
+                    player.sendMessage("");
+                }
 
-                permissionsCheck(player);
-                dataCalculations(player, skillValue);
+            permissionsCheck(player);
+            dataCalculations(player, skillValue);
 
-                sendSkillCommandHeader(player, mcMMOPlayer, (int) skillValue);
+            sendSkillCommandHeader(player, mcMMOPlayer, (int) skillValue);
 
-                //Make JSON text components
-                List<TextComponent> subskillTextComponents = getTextComponents(player);
+            //Make JSON text components
+            List<TextComponent> subskillTextComponents = getTextComponents(player);
 
-                //Subskills Header
-                player.sendMessage(LocaleLoader.getString("Skills.Overhaul.Header", LocaleLoader.getString("Effects.SubSkills.Overhaul")));
+            //Subskills Header
+            player.sendMessage(LocaleLoader.getString("Skills.Overhaul.Header", LocaleLoader.getString("Effects.SubSkills.Overhaul")));
 
-                //Send JSON text components
+            //Send JSON text components
 
-                TextComponentFactory.sendPlayerSubSkillList(player, subskillTextComponents);
+            TextComponentFactory.sendPlayerSubSkillList(player, subskillTextComponents);
 
                 /*for(TextComponent tc : subskillTextComponents)
                 {
                     player.spigot().sendMessage(new TextComponent[]{tc, new TextComponent(": TESTING")});
                 }*/
 
-                //Stats
-                getStatMessages(player, isLucky, hasEndurance, skillValue);
+            //Stats
+            getStatMessages(player, isLucky, hasEndurance, skillValue);
 
-                //Header
+            //Header
 
 
-                //Link Header
-                if(Config.getInstance().getUrlLinksEnabled())
-                {
-                    player.sendMessage(LocaleLoader.getString("Overhaul.mcMMO.Header"));
-                    TextComponentFactory.sendPlayerUrlHeader(player);
-                }
+            //Link Header
+            if (Config.getInstance().getUrlLinksEnabled()) {
+                player.sendMessage(LocaleLoader.getString("Overhaul.mcMMO.Header"));
+                TextComponentFactory.sendPlayerUrlHeader(player);
+            }
 
 
-                if (Config.getInstance().getScoreboardsEnabled() && Config.getInstance().getSkillUseBoard()) {
-                    ScoreboardManager.enablePlayerSkillScoreboard(player, skill);
-                }
+            if (Config.getInstance().getScoreboardsEnabled() && Config.getInstance().getSkillUseBoard()) {
+                ScoreboardManager.enablePlayerSkillScoreboard(player, skill);
+            }
 
-                return true;
-            default:
-                return skillGuideCommand.onCommand(sender, command, label, args);
+            return true;
         }
+        return skillGuideCommand.onCommand(sender, command, label, args);
     }
 
     private void getStatMessages(Player player, boolean isLucky, boolean hasEndurance, float skillValue) {
@@ -165,31 +162,28 @@ public abstract class SkillCommand implements TabExecutor {
 
 
             Set<PrimarySkillType> parents = FamilyTree.getParents(skill);
-            ArrayList<PrimarySkillType> parentList = new ArrayList<>();
 
             //TODO: Add JSON here
-            for (PrimarySkillType parent : parents) {
-                parentList.add(parent);
-                /*player.sendMessage(parent.getName() + " - " + LocaleLoader.getString("Effects.Level.Overhaul", mcMMOPlayer.getSkillLevel(parent), mcMMOPlayer.getSkillXpLevel(parent), mcMMOPlayer.getXpToLevel(parent)))*/;
-            }
+            /*player.sendMessage(parent.getName() + " - " + LocaleLoader.getString("Effects.Level.Overhaul", mcMMOPlayer.getSkillLevel(parent), mcMMOPlayer.getSkillXpLevel(parent), mcMMOPlayer.getXpToLevel(parent)))*/
+            ArrayList<PrimarySkillType> parentList = new ArrayList<>(parents);
 
-            String parentMessage = "";
+            StringBuilder parentMessage = new StringBuilder();
 
             for(int i = 0; i < parentList.size(); i++)
             {
                 if(i+1 < parentList.size())
                 {
-                    parentMessage += LocaleLoader.getString("Effects.Child.ParentList", parentList.get(i).getName(), mcMMOPlayer.getSkillLevel(parentList.get(i)));
-                    parentMessage += ChatColor.GRAY+", ";
+                    parentMessage.append(LocaleLoader.getString("Effects.Child.ParentList", parentList.get(i).getName(), mcMMOPlayer.getSkillLevel(parentList.get(i))));
+                    parentMessage.append(ChatColor.GRAY).append(", ");
                 } else {
-                    parentMessage += LocaleLoader.getString("Effects.Child.ParentList", parentList.get(i).getName(), mcMMOPlayer.getSkillLevel(parentList.get(i)));
+                    parentMessage.append(LocaleLoader.getString("Effects.Child.ParentList", parentList.get(i).getName(), mcMMOPlayer.getSkillLevel(parentList.get(i))));
                 }
             }
 
             //XP GAIN METHOD
             player.sendMessage(LocaleLoader.getString("Commands.XPGain.Overhaul", LocaleLoader.getString("Commands.XPGain.Child")));
 
-            player.sendMessage(LocaleLoader.getString("Effects.Child.Overhaul", skillValue, parentMessage));
+            player.sendMessage(LocaleLoader.getString("Effects.Child.Overhaul", skillValue, parentMessage.toString()));
             //LEVEL
             //player.sendMessage(LocaleLoader.getString("Effects.Child.Overhaul", skillValue, skillValue));
 
@@ -215,13 +209,11 @@ public abstract class SkillCommand implements TabExecutor {
     }
 
     @Override
-    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
-        switch (args.length) {
-            case 1:
-                return ImmutableList.of("?");
-            default:
-                return ImmutableList.of();
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        if (args.length == 1) {
+            return ImmutableList.of("?");
         }
+        return ImmutableList.of();
     }
 
     protected int calculateRank(float skillValue, int maxLevel, int rankChangeLevel) {

src/main/java/com/gmail/nossr50/commands/skills/SkillGuideCommand.java

@@ -6,15 +6,16 @@ import com.gmail.nossr50.util.StringUtils;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 
 public class SkillGuideCommand implements CommandExecutor {
-    private String header;
-    private ArrayList<String> guide;
+    private final String header;
+    private final ArrayList<String> guide;
 
-    private String invalidPage = LocaleLoader.getString("Guides.Page.Invalid");
+    private final String invalidPage = LocaleLoader.getString("Guides.Page.Invalid");
 
     public SkillGuideCommand(PrimarySkillType skill) {
         header = LocaleLoader.getString("Guides.Header", skill.getName());
@@ -22,7 +23,7 @@ public class SkillGuideCommand implements CommandExecutor {
     }
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
         switch (args.length) {
             case 1:
                 if (!args[0].equals("?")) {
@@ -67,7 +68,7 @@ public class SkillGuideCommand implements CommandExecutor {
 
     private ArrayList<String> grabPageContents(int page) {
         int pageIndexStart = 8 * (page - 1); // Determine what string to start at
-        ArrayList<String> allStrings = new ArrayList<String>();
+        ArrayList<String> allStrings = new ArrayList<>();
 
         allStrings.add(header);
 
@@ -86,7 +87,7 @@ public class SkillGuideCommand implements CommandExecutor {
     }
 
     private ArrayList<String> getGuide(PrimarySkillType skill) {
-        ArrayList<String> guide = new ArrayList<String>();
+        ArrayList<String> guide = new ArrayList<>();
 
         for (int i = 0; i < 10; i++) {
             String[] section = LocaleLoader.getString("Guides." + StringUtils.getCapitalized(skill.toString()) + ".Section." + i).split("\n");

src/main/java/com/gmail/nossr50/commands/skills/SmeltingCommand.java

@@ -62,7 +62,7 @@ public class SmeltingCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         /*if (canFluxMine) {
             messages.add(getStatMessage(SubSkillType.SMELTING_FLUX_MINING, str_fluxMiningChance)

src/main/java/com/gmail/nossr50/commands/skills/SwordsCommand.java

@@ -68,7 +68,7 @@ public class SwordsCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         int ruptureTicks = UserManager.getPlayer(player).getSwordsManager().getRuptureBleedTicks();
         double ruptureDamagePlayers =  RankUtils.getRank(player, SubSkillType.SWORDS_RUPTURE) >= 3 ? AdvancedConfig.getInstance().getRuptureDamagePlayer() * 1.5D : AdvancedConfig.getInstance().getRuptureDamagePlayer();

src/main/java/com/gmail/nossr50/commands/skills/TamingCommand.java

@@ -56,7 +56,7 @@ public class TamingCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canEnvironmentallyAware) {
             messages.add(LocaleLoader.getString("Ability.Generic.Template", LocaleLoader.getString("Taming.Ability.Bonus.0"), LocaleLoader.getString("Taming.Ability.Bonus.1")));

src/main/java/com/gmail/nossr50/commands/skills/UnarmedCommand.java

@@ -40,7 +40,7 @@ public class UnarmedCommand extends SkillCommand {
     protected void dataCalculations(Player player, float skillValue) {
         // UNARMED_ARROW_DEFLECT
         if (canDeflect) {
-            String[] deflectStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.UNARMED_ARROW_DEFLECT);;
+            String[] deflectStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.UNARMED_ARROW_DEFLECT);
             deflectChance = deflectStrings[0];
             deflectChanceLucky = deflectStrings[1];
         }
@@ -54,7 +54,7 @@ public class UnarmedCommand extends SkillCommand {
 
         // UNARMED_DISARM
         if (canDisarm) {
-            String[] disarmStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.UNARMED_DISARM);;
+            String[] disarmStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.UNARMED_DISARM);
             disarmChance = disarmStrings[0];
             disarmChanceLucky = disarmStrings[1];
         }
@@ -84,7 +84,7 @@ public class UnarmedCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canDeflect) {
             messages.add(getStatMessage(SubSkillType.UNARMED_ARROW_DEFLECT, deflectChance)

src/main/java/com/gmail/nossr50/commands/skills/WoodcuttingCommand.java

@@ -46,7 +46,7 @@ public class WoodcuttingCommand extends SkillCommand {
     }
 
     private void setDoubleDropClassicChanceStrings(Player player) {
-        String[] doubleDropStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.WOODCUTTING_HARVEST_LUMBER);;
+        String[] doubleDropStrings = getAbilityDisplayValues(SkillActivationType.RANDOM_LINEAR_100_SCALE_WITH_CAP, player, SubSkillType.WOODCUTTING_HARVEST_LUMBER);
         doubleDropChance = doubleDropStrings[0];
         doubleDropChanceLucky = doubleDropStrings[1];
     }
@@ -63,7 +63,7 @@ public class WoodcuttingCommand extends SkillCommand {
 
     @Override
     protected List<String> statsDisplay(Player player, float skillValue, boolean hasEndurance, boolean isLucky) {
-        List<String> messages = new ArrayList<String>();
+        List<String> messages = new ArrayList<>();
 
         if (canDoubleDrop) {
             messages.add(getStatMessage(SubSkillType.WOODCUTTING_HARVEST_LUMBER, doubleDropChance)

src/main/java/com/gmail/nossr50/config/AdvancedConfig.java

@@ -28,7 +28,7 @@ public class AdvancedConfig extends AutoUpdateConfigLoader {
     @Override
     protected boolean validateKeys() {
         // Validate all the settings!
-        List<String> reason = new ArrayList<String>();
+        List<String> reason = new ArrayList<>();
 
         /* GENERAL */
         if (getAbilityLength() < 1) {
@@ -687,9 +687,8 @@ public class AdvancedConfig extends AutoUpdateConfigLoader {
     }
 
     public double getMaximumProbability(SubSkillType subSkillType) {
-        double maximumProbability = config.getDouble(subSkillType.getAdvConfigAddress() + ".ChanceMax", 100.0D);
 
-        return maximumProbability;
+        return config.getDouble(subSkillType.getAdvConfigAddress() + ".ChanceMax", 100.0D);
     }
 
     public double getMaximumProbability(AbstractSubSkill abstractSubSkill)
@@ -719,6 +718,11 @@ public class AdvancedConfig extends AutoUpdateConfigLoader {
         return config.getBoolean("Feedback.Events.XP.SendTitles", true);
     }
 
+    public boolean sendAbilityNotificationToOtherPlayers()
+    {
+        return config.getBoolean("Feedback.Events.AbilityActivation.SendNotificationToOtherPlayers", true);
+    }
+
     /*
      * JSON Style Settings
      */

src/main/java/com/gmail/nossr50/config/AutoUpdateConfigLoader.java

@@ -28,10 +28,10 @@ public abstract class AutoUpdateConfigLoader extends ConfigLoader {
 
         boolean needSave = false;
 
-        Set<String> oldKeys = new HashSet<String>(configKeys);
+        Set<String> oldKeys = new HashSet<>(configKeys);
         oldKeys.removeAll(internalConfigKeys);
 
-        Set<String> newKeys = new HashSet<String>(internalConfigKeys);
+        Set<String> newKeys = new HashSet<>(internalConfigKeys);
         newKeys.removeAll(configKeys);
 
         // Don't need a re-save if we have old keys sticking around?
@@ -66,17 +66,17 @@ public abstract class AutoUpdateConfigLoader extends ConfigLoader {
             try {
                 // Read internal
                 BufferedReader reader = new BufferedReader(new InputStreamReader(plugin.getResource(fileName)));
-                LinkedHashMap<String, String> comments = new LinkedHashMap<String, String>();
-                String temp = "";
+                LinkedHashMap<String, String> comments = new LinkedHashMap<>();
+                StringBuilder temp = new StringBuilder();
 
                 String line;
                 while ((line = reader.readLine()) != null) {
                     if (line.contains("#")) {
-                        temp += line + "\n";
+                        temp.append(line).append("\n");
                     }
                     else if (line.contains(":")) {
                         line = line.substring(0, line.indexOf(":") + 1);
-                        if (!temp.isEmpty()) {
+                        if (temp.length() > 0) {
                             if(comments.containsKey(line)) {
                                 int index = 0;
                                 while(comments.containsKey(line + index)) {
@@ -86,14 +86,14 @@ public abstract class AutoUpdateConfigLoader extends ConfigLoader {
                                 line = line + index;
                             }
 
-                            comments.put(line, temp);
-                            temp = "";
+                            comments.put(line, temp.toString());
+                            temp = new StringBuilder();
                         }
                     }
                 }
 
                 // Dump to the new one
-                HashMap<String, Integer> indexed = new HashMap<String, Integer>();
+                HashMap<String, Integer> indexed = new HashMap<>();
                 for (String key : comments.keySet()) {
                     String actualkey = key.substring(0, key.indexOf(":") + 1);
 

src/main/java/com/gmail/nossr50/config/Config.java

@@ -39,7 +39,7 @@ public class Config extends AutoUpdateConfigLoader {
     @Override
     protected boolean validateKeys() {
         // Validate all the settings!
-        List<String> reason = new ArrayList<String>();
+        List<String> reason = new ArrayList<>();
 
         /* General Settings */
         if (getSaveInterval() <= 0) {

src/main/java/com/gmail/nossr50/config/ConfigLoader.java

@@ -10,7 +10,7 @@ import java.util.List;
 public abstract class ConfigLoader {
     protected static final mcMMO plugin = mcMMO.p;
     protected String fileName;
-    private File configFile;
+    private final File configFile;
     protected FileConfiguration config;
 
     public ConfigLoader(String relativePath, String fileName) {

src/main/java/com/gmail/nossr50/config/HiddenConfig.java

@@ -7,14 +7,11 @@ import java.io.InputStreamReader;
 
 public class HiddenConfig {
     private static HiddenConfig instance;
-    private String fileName;
+    private final String fileName;
     private YamlConfiguration config;
     private boolean chunkletsEnabled;
     private int conversionRate;
     private boolean useEnchantmentBuffs;
-    private int uuidConvertAmount;
-    private int mojangRateLimit;
-    private long mojangLimitPeriod;
 
     public HiddenConfig(String fileName) {
         this.fileName = fileName;
@@ -36,9 +33,6 @@ public class HiddenConfig {
             chunkletsEnabled = config.getBoolean("Options.Chunklets", true);
             conversionRate = config.getInt("Options.ConversionRate", 1);
             useEnchantmentBuffs = config.getBoolean("Options.EnchantmentBuffs", true);
-            uuidConvertAmount = config.getInt("Options.UUIDConvertAmount", 5);
-            mojangRateLimit = config.getInt("Options.MojangRateLimit", 50000);
-            mojangLimitPeriod = config.getLong("Options.MojangLimitPeriod", 600000);
         }
     }
 
@@ -53,16 +47,4 @@ public class HiddenConfig {
     public boolean useEnchantmentBuffs() {
         return useEnchantmentBuffs;
     }
-
-    public int getUUIDConvertAmount() {
-        return uuidConvertAmount;
-    }
-
-    public int getMojangRateLimit() {
-        return mojangRateLimit;
-    }
-
-    public long getMojangLimitPeriod() {
-        return mojangLimitPeriod;
-    }
 }

src/main/java/com/gmail/nossr50/config/RankConfig.java

@@ -13,7 +13,7 @@ public class RankConfig extends AutoUpdateConfigLoader {
     {
         super("skillranks.yml");
         validate();
-        this.instance = this;
+        instance = this;
     }
 
     @Override
@@ -31,7 +31,7 @@ public class RankConfig extends AutoUpdateConfigLoader {
 
     @Override
     protected boolean validateKeys() {
-        List<String> reason = new ArrayList<String>();
+        List<String> reason = new ArrayList<>();
 
         /*
          * In the future this method will check keys for all skills, but for now it only checks overhauled skills

src/main/java/com/gmail/nossr50/config/SoundConfig.java

@@ -9,7 +9,7 @@ public class SoundConfig extends AutoUpdateConfigLoader {
     {
         super("sounds.yml");
         validate();
-        this.instance = this;
+        instance = this;
     }
 
     @Override

src/main/java/com/gmail/nossr50/config/WorldBlacklist.java

@@ -11,7 +11,7 @@ import java.util.ArrayList;
  */
 public class WorldBlacklist {
     private static ArrayList<String> blacklist;
-    private mcMMO plugin;
+    private final mcMMO plugin;
 
     private final String blackListFileName = "world_blacklist.txt";
 

src/main/java/com/gmail/nossr50/config/experience/ExperienceConfig.java

@@ -38,7 +38,7 @@ public class ExperienceConfig extends AutoUpdateConfigLoader {
 
     @Override
     protected boolean validateKeys() {
-        List<String> reason = new ArrayList<String>();
+        List<String> reason = new ArrayList<>();
 
         /*
          * FORMULA SETTINGS

src/main/java/com/gmail/nossr50/config/mods/CustomArmorConfig.java

@@ -15,12 +15,12 @@ import java.util.Set;
 public class CustomArmorConfig extends ConfigLoader {
     private boolean needsUpdate = false;
 
-    public List<Material> customBoots       = new ArrayList<Material>();
-    public List<Material> customChestplates = new ArrayList<Material>();
-    public List<Material> customHelmets     = new ArrayList<Material>();
-    public List<Material> customLeggings    = new ArrayList<Material>();
+    public List<Material> customBoots       = new ArrayList<>();
+    public List<Material> customChestplates = new ArrayList<>();
+    public List<Material> customHelmets     = new ArrayList<>();
+    public List<Material> customLeggings    = new ArrayList<>();
 
-    public List<Repairable> repairables = new ArrayList<Repairable>();
+    public List<Repairable> repairables = new ArrayList<>();
 
     protected CustomArmorConfig(String fileName) {
         super("mods", fileName);

src/main/java/com/gmail/nossr50/config/mods/CustomEntityConfig.java

@@ -9,8 +9,8 @@ import org.bukkit.inventory.ItemStack;
 import java.util.HashMap;
 
 public class CustomEntityConfig extends ConfigLoader {
-    public HashMap<String, CustomEntity> customEntityClassMap = new HashMap<String, CustomEntity>();
-    public HashMap<String, CustomEntity> customEntityTypeMap  = new HashMap<String, CustomEntity>();
+    public HashMap<String, CustomEntity> customEntityClassMap = new HashMap<>();
+    public HashMap<String, CustomEntity> customEntityTypeMap  = new HashMap<>();
 
     protected CustomEntityConfig(String fileName) {
         super("mods", fileName);

src/main/java/com/gmail/nossr50/config/mods/CustomToolConfig.java

@@ -17,16 +17,16 @@ import java.util.Set;
 public class CustomToolConfig extends ConfigLoader {
     private boolean needsUpdate = false;
 
-    public List<Material> customAxes     = new ArrayList<Material>();
-    public List<Material> customBows     = new ArrayList<Material>();
-    public List<Material> customHoes     = new ArrayList<Material>();
-    public List<Material> customPickaxes = new ArrayList<Material>();
-    public List<Material> customShovels  = new ArrayList<Material>();
-    public List<Material> customSwords   = new ArrayList<Material>();
+    public List<Material> customAxes     = new ArrayList<>();
+    public List<Material> customBows     = new ArrayList<>();
+    public List<Material> customHoes     = new ArrayList<>();
+    public List<Material> customPickaxes = new ArrayList<>();
+    public List<Material> customShovels  = new ArrayList<>();
+    public List<Material> customSwords   = new ArrayList<>();
 
-    public HashMap<Material, CustomTool> customToolMap = new HashMap<Material, CustomTool>();
+    public HashMap<Material, CustomTool> customToolMap = new HashMap<>();
 
-    public List<Repairable> repairables = new ArrayList<Repairable>();
+    public List<Repairable> repairables = new ArrayList<>();
 
     protected CustomToolConfig(String fileName) {
         super("mods", fileName);

src/main/java/com/gmail/nossr50/config/party/ItemWeightConfig.java

@@ -27,7 +27,7 @@ public class ItemWeightConfig extends ConfigLoader {
     }
 
     public HashSet<Material> getMiscItems() {
-        HashSet<Material> miscItems = new HashSet<Material>();
+        HashSet<Material> miscItems = new HashSet<>();
 
         for (String item : config.getStringList("Party_Shareables.Misc_Items")) {
             Material material = Material.getMaterial(item.toUpperCase(Locale.ENGLISH));

src/main/java/com/gmail/nossr50/config/skills/alchemy/PotionConfig.java

@@ -18,16 +18,16 @@ import java.util.Map;
 public class PotionConfig extends ConfigLoader {
     private static PotionConfig instance;
 
-    private List<ItemStack> concoctionsIngredientsTierOne = new ArrayList<ItemStack>();
-    private List<ItemStack> concoctionsIngredientsTierTwo = new ArrayList<ItemStack>();
-    private List<ItemStack> concoctionsIngredientsTierThree = new ArrayList<ItemStack>();
-    private List<ItemStack> concoctionsIngredientsTierFour = new ArrayList<ItemStack>();
-    private List<ItemStack> concoctionsIngredientsTierFive = new ArrayList<ItemStack>();
-    private List<ItemStack> concoctionsIngredientsTierSix = new ArrayList<ItemStack>();
-    private List<ItemStack> concoctionsIngredientsTierSeven = new ArrayList<ItemStack>();
-    private List<ItemStack> concoctionsIngredientsTierEight = new ArrayList<ItemStack>();
+    private final List<ItemStack> concoctionsIngredientsTierOne = new ArrayList<>();
+    private final List<ItemStack> concoctionsIngredientsTierTwo = new ArrayList<>();
+    private final List<ItemStack> concoctionsIngredientsTierThree = new ArrayList<>();
+    private final List<ItemStack> concoctionsIngredientsTierFour = new ArrayList<>();
+    private final List<ItemStack> concoctionsIngredientsTierFive = new ArrayList<>();
+    private final List<ItemStack> concoctionsIngredientsTierSix = new ArrayList<>();
+    private final List<ItemStack> concoctionsIngredientsTierSeven = new ArrayList<>();
+    private final List<ItemStack> concoctionsIngredientsTierEight = new ArrayList<>();
 
-    private Map<String, AlchemyPotion> potionMap = new HashMap<String, AlchemyPotion>();
+    private final Map<String, AlchemyPotion> potionMap = new HashMap<>();
 
     private PotionConfig() {
         super("potions.yml");
@@ -137,14 +137,14 @@ public class PotionConfig extends ConfigLoader {
                 material = Material.valueOf(mat);
             }
 
-            List<String> lore = new ArrayList<String>();
+            List<String> lore = new ArrayList<>();
             if (potion_section.contains("Lore")) {
                 for (String line : potion_section.getStringList("Lore")) {
                     lore.add(ChatColor.translateAlternateColorCodes('&', line));
                 }
             }
 
-            List<PotionEffect> effects = new ArrayList<PotionEffect>();
+            List<PotionEffect> effects = new ArrayList<>();
             if (potion_section.contains("Effects")) {
                 for (String effect : potion_section.getStringList("Effects")) {
                     String[] parts = effect.split(" ");
@@ -162,7 +162,7 @@ public class PotionConfig extends ConfigLoader {
                 }
             }
             
-            Color color = null;
+            Color color;
             if (potion_section.contains("Color")) {
                 color = Color.fromRGB(potion_section.getInt("Color"));
             }
@@ -170,7 +170,7 @@ public class PotionConfig extends ConfigLoader {
                 color = this.generateColor(effects);
             }
 
-            Map<ItemStack, String> children = new HashMap<ItemStack, String>();
+            Map<ItemStack, String> children = new HashMap<>();
             if (potion_section.contains("Children")) {
                 for (String child : potion_section.getConfigurationSection("Children").getKeys(false)) {
                     ItemStack ingredient = loadIngredient(child);
@@ -255,7 +255,7 @@ public class PotionConfig extends ConfigLoader {
     
     public Color generateColor(List<PotionEffect> effects) {
         if (effects != null && !effects.isEmpty()) {
-            List<Color> colors = new ArrayList<Color>();
+            List<Color> colors = new ArrayList<>();
             for (PotionEffect effect : effects) {
                 if (effect.getType().getColor() != null) {
                     colors.add(effect.getType().getColor());
@@ -280,8 +280,7 @@ public class PotionConfig extends ConfigLoader {
             green += color.getGreen();
             blue += color.getBlue();
         }
-        Color color = Color.fromRGB(red/colors.size(), green/colors.size(), blue/colors.size());
-        return color;
+        return Color.fromRGB(red/colors.size(), green/colors.size(), blue/colors.size());
     }
     
 }

src/main/java/com/gmail/nossr50/config/skills/repair/RepairConfig.java

@@ -15,7 +15,7 @@ import java.util.*;
 
 public class RepairConfig extends ConfigLoader {
     private List<Repairable> repairables;
-    private HashSet<String> notSupported;
+    private final HashSet<String> notSupported;
 
     public RepairConfig(String fileName) {
         super(fileName);
@@ -25,7 +25,7 @@ public class RepairConfig extends ConfigLoader {
 
     @Override
     protected void loadKeys() {
-        repairables = new ArrayList<Repairable>();
+        repairables = new ArrayList<>();
 
         if (!config.isConfigurationSection("Repairables")) {
             mcMMO.p.getLogger().severe("Could not find Repairables section in " + fileName);
@@ -42,7 +42,7 @@ public class RepairConfig extends ConfigLoader {
             }
 
             // Validate all the things!
-            List<String> reason = new ArrayList<String>();
+            List<String> reason = new ArrayList<>();
 
             // Item Material
             Material itemMaterial = Material.matchMaterial(key);
@@ -177,7 +177,7 @@ public class RepairConfig extends ConfigLoader {
     }
 
     protected List<Repairable> getLoadedRepairables() {
-        return repairables == null ? new ArrayList<Repairable>() : repairables;
+        return repairables == null ? new ArrayList<>() : repairables;
     }
 
     private boolean noErrorsInRepairable(List<String> issues) {

src/main/java/com/gmail/nossr50/config/skills/repair/RepairConfigManager.java

@@ -11,7 +11,7 @@ import java.util.List;
 import java.util.regex.Pattern;
 
 public class RepairConfigManager {
-    private final List<Repairable> repairables = new ArrayList<Repairable>();
+    private final List<Repairable> repairables = new ArrayList<>();
 
     public RepairConfigManager(mcMMO plugin) {
         Pattern pattern = Pattern.compile("repair\\.(?:.+)\\.yml");

src/main/java/com/gmail/nossr50/config/skills/salvage/SalvageConfig.java

@@ -18,7 +18,7 @@ import java.util.*;
 
 public class SalvageConfig extends ConfigLoader {
     private List<Salvageable> salvageables;
-    private HashSet<String> notSupported;
+    private final HashSet<String> notSupported;
 
     public SalvageConfig(String fileName) {
         super(fileName);
@@ -28,7 +28,7 @@ public class SalvageConfig extends ConfigLoader {
 
     @Override
     protected void loadKeys() {
-        salvageables = new ArrayList<Salvageable>();
+        salvageables = new ArrayList<>();
 
         if (!config.isConfigurationSection("Salvageables")) {
             mcMMO.p.getLogger().severe("Could not find Salvageables section in " + fileName);
@@ -59,7 +59,7 @@ public class SalvageConfig extends ConfigLoader {
 
         for (String key : keys) {
             // Validate all the things!
-            List<String> reason = new ArrayList<String>();
+            List<String> reason = new ArrayList<>();
 
             // Item Material
             Material itemMaterial = Material.matchMaterial(key);
@@ -195,7 +195,7 @@ public class SalvageConfig extends ConfigLoader {
     }
 
     protected List<Salvageable> getLoadedSalvageables() {
-        return salvageables == null ? new ArrayList<Salvageable>() : salvageables;
+        return salvageables == null ? new ArrayList<>() : salvageables;
     }
 
     private boolean noErrorsInSalvageable(List<String> issues) {

src/main/java/com/gmail/nossr50/config/skills/salvage/SalvageConfigManager.java

@@ -11,7 +11,7 @@ import java.util.List;
 import java.util.regex.Pattern;
 
 public class SalvageConfigManager {
-    private final List<Salvageable> salvageables = new ArrayList<Salvageable>();
+    private final List<Salvageable> salvageables = new ArrayList<>();
 
     public SalvageConfigManager(mcMMO plugin) {
         Pattern pattern = Pattern.compile("salvage\\.(?:.+)\\.yml");

src/main/java/com/gmail/nossr50/config/treasure/TreasureConfig.java

@@ -24,13 +24,13 @@ public class TreasureConfig extends ConfigLoader {
 
     private static TreasureConfig instance;
 
-    public HashMap<String, List<ExcavationTreasure>> excavationMap = new HashMap<String, List<ExcavationTreasure>>();
+    public HashMap<String, List<ExcavationTreasure>> excavationMap = new HashMap<>();
 
-    public HashMap<EntityType, List<ShakeTreasure>> shakeMap  = new HashMap<EntityType, List<ShakeTreasure>>();
-    public HashMap<String, List<HylianTreasure>>    hylianMap = new HashMap<String, List<HylianTreasure>>();
+    public HashMap<EntityType, List<ShakeTreasure>> shakeMap  = new HashMap<>();
+    public HashMap<String, List<HylianTreasure>>    hylianMap = new HashMap<>();
 
-    public HashMap<Rarity, List<FishingTreasure>>     fishingRewards      = new HashMap<Rarity, List<FishingTreasure>>();
-    public HashMap<Rarity, List<EnchantmentTreasure>> fishingEnchantments = new HashMap<Rarity, List<EnchantmentTreasure>>();
+    public HashMap<Rarity, List<FishingTreasure>>     fishingRewards      = new HashMap<>();
+    public HashMap<Rarity, List<EnchantmentTreasure>> fishingEnchantments = new HashMap<>();
 
     private TreasureConfig() {
         super("treasures.yml");
@@ -49,7 +49,7 @@ public class TreasureConfig extends ConfigLoader {
     @Override
     protected boolean validateKeys() {
         // Validate all the settings!
-        List<String> reason = new ArrayList<String>();
+        List<String> reason = new ArrayList<>();
         for (String tier : config.getConfigurationSection("Enchantment_Drop_Rates").getKeys(false)) {
             double totalEnchantDropRate = 0;
             double totalItemDropRate = 0;
@@ -116,13 +116,13 @@ public class TreasureConfig extends ConfigLoader {
         // Initialize fishing HashMap
         for (Rarity rarity : Rarity.values()) {
             if (!fishingRewards.containsKey(rarity)) {
-                fishingRewards.put(rarity, (new ArrayList<FishingTreasure>()));
+                fishingRewards.put(rarity, (new ArrayList<>()));
             }
         }
 
         for (String treasureName : treasureSection.getKeys(false)) {
             // Validate all the things!
-            List<String> reason = new ArrayList<String>();
+            List<String> reason = new ArrayList<>();
 
             String[] treasureInfo = treasureName.split("[|]");
             String materialName = treasureInfo[0];
@@ -135,7 +135,7 @@ public class TreasureConfig extends ConfigLoader {
             if (materialName.contains("INVENTORY")) {
                 // Use magic material BEDROCK to know that we're grabbing something from the inventory and not a normal treasure
                 if (!shakeMap.containsKey(EntityType.PLAYER))
-                    shakeMap.put(EntityType.PLAYER, new ArrayList<ShakeTreasure>());
+                    shakeMap.put(EntityType.PLAYER, new ArrayList<>());
                 shakeMap.get(EntityType.PLAYER).add(new ShakeTreasure(new ItemStack(Material.BEDROCK, 1, (byte) 0), 1, getInventoryStealDropChance(), getInventoryStealDropLevel()));
                 continue;
             } else {
@@ -218,7 +218,7 @@ public class TreasureConfig extends ConfigLoader {
                     }
 
                     if (config.contains(type + "." + treasureName + ".Lore")) {
-                        List<String> lore = new ArrayList<String>();
+                        List<String> lore = new ArrayList<>();
                         for (String s : config.getStringList(type + "." + treasureName + ".Lore")) {
                             lore.add(ChatColor.translateAlternateColorCodes('&', s));
                         }
@@ -237,7 +237,7 @@ public class TreasureConfig extends ConfigLoader {
 
                 if (config.contains(type + "." + treasureName + ".Lore")) {
                     ItemMeta itemMeta = item.getItemMeta();
-                    List<String> lore = new ArrayList<String>();
+                    List<String> lore = new ArrayList<>();
                     for (String s : config.getStringList(type + "." + treasureName + ".Lore")) {
                         lore.add(ChatColor.translateAlternateColorCodes('&', s));
                     }
@@ -254,7 +254,7 @@ public class TreasureConfig extends ConfigLoader {
 
                     EntityType entityType = EntityType.valueOf(type.substring(6));
                     if (!shakeMap.containsKey(entityType))
-                        shakeMap.put(entityType, new ArrayList<ShakeTreasure>());
+                        shakeMap.put(entityType, new ArrayList<>());
                     shakeMap.get(entityType).add(shakeTreasure);
                 } else if (isExcavation) {
                     ExcavationTreasure excavationTreasure = new ExcavationTreasure(item, xp, dropChance, dropLevel);
@@ -262,7 +262,7 @@ public class TreasureConfig extends ConfigLoader {
 
                     for (String blockType : dropList) {
                         if (!excavationMap.containsKey(blockType))
-                            excavationMap.put(blockType, new ArrayList<ExcavationTreasure>());
+                            excavationMap.put(blockType, new ArrayList<>());
                         excavationMap.get(blockType).add(excavationTreasure);
                     }
                 } else if (isHylian) {
@@ -305,7 +305,7 @@ public class TreasureConfig extends ConfigLoader {
 
     private void AddHylianTreasure(String dropper, HylianTreasure treasure) {
         if (!hylianMap.containsKey(dropper))
-            hylianMap.put(dropper, new ArrayList<HylianTreasure>());
+            hylianMap.put(dropper, new ArrayList<>());
         hylianMap.get(dropper).add(treasure);
     }
 
@@ -316,7 +316,7 @@ public class TreasureConfig extends ConfigLoader {
             }
 
             if (!fishingEnchantments.containsKey(rarity)) {
-                fishingEnchantments.put(rarity, (new ArrayList<EnchantmentTreasure>()));
+                fishingEnchantments.put(rarity, (new ArrayList<>()));
             }
 
             ConfigurationSection enchantmentSection = config.getConfigurationSection("Enchantments_Rarity." + rarity.toString());

src/main/java/com/gmail/nossr50/database/DatabaseManager.java

@@ -12,19 +12,19 @@ import java.util.UUID;
 
 public interface DatabaseManager {
     // One month in milliseconds
-    public final long PURGE_TIME = 2630000000L * Config.getInstance().getOldUsersCutoff();
+    long PURGE_TIME = 2630000000L * Config.getInstance().getOldUsersCutoff();
     // During convertUsers, how often to output a status
-    public final int progressInterval = 200;
+    int progressInterval = 200;
 
     /**
      * Purge users with 0 power level from the database.
      */
-    public void purgePowerlessUsers();
+    void purgePowerlessUsers();
 
     /**
      * Purge users who haven't logged on in over a certain time frame from the database.
      */
-    public void purgeOldUsers();
+    void purgeOldUsers();
 
     /**
      * Remove a user from the database.
@@ -33,14 +33,14 @@ public interface DatabaseManager {
      * @param uuid player UUID, can be null
      * @return true if the user was successfully removed, false otherwise
      */
-    public boolean removeUser(String playerName, UUID uuid);
+    boolean removeUser(String playerName, UUID uuid);
 
     /**
      * Removes any cache used for faster lookups
      * Currently only used for SQL
      * @param uuid target UUID to cleanup
      */
-    public void cleanupUser(UUID uuid);
+    void cleanupUser(UUID uuid);
 
     /**
      * Save a user to the database.
@@ -48,7 +48,7 @@ public interface DatabaseManager {
      * @param profile The profile of the player to save
      * @return true if successful, false on failure
      */
-    public boolean saveUser(PlayerProfile profile);
+    boolean saveUser(PlayerProfile profile);
 
     /**
     * Retrieve leaderboard info.
@@ -58,7 +58,7 @@ public interface DatabaseManager {
     * @param statsPerPage The number of stats per page
     * @return the requested leaderboard information
     */
-    public List<PlayerStat> readLeaderboard(PrimarySkillType skill, int pageNumber, int statsPerPage);
+    List<PlayerStat> readLeaderboard(PrimarySkillType skill, int pageNumber, int statsPerPage);
 
     /**
      * Retrieve rank info into a HashMap from PrimarySkillType to the rank.
@@ -69,7 +69,7 @@ public interface DatabaseManager {
      * @param playerName The name of the user to retrieve the rankings for
      * @return the requested rank information
      */
-    public Map<PrimarySkillType, Integer> readRank(String playerName);
+    Map<PrimarySkillType, Integer> readRank(String playerName);
 
     /**
      * Add a new user to the database.
@@ -77,7 +77,7 @@ public interface DatabaseManager {
      * @param playerName The name of the player to be added to the database
      * @param uuid The uuid of the player to be added to the database
      */
-    public void newUser(String playerName, UUID uuid);
+    void newUser(String playerName, UUID uuid);
 
     /**
      * Load a player from the database.
@@ -91,7 +91,7 @@ public interface DatabaseManager {
      *          and createNew is false
      */
     @Deprecated
-    public PlayerProfile loadPlayerProfile(String playerName, boolean createNew);
+    PlayerProfile loadPlayerProfile(String playerName, boolean createNew);
 
     /**
      * Load a player from the database.
@@ -99,7 +99,7 @@ public interface DatabaseManager {
      * @param uuid The uuid of the player to load from the database
      * @return The player's data, or an unloaded PlayerProfile if not found
      */
-    public PlayerProfile loadPlayerProfile(UUID uuid);
+    PlayerProfile loadPlayerProfile(UUID uuid);
 
     /**
      * Load a player from the database. Attempt to use uuid, fall back on playername
@@ -111,14 +111,14 @@ public interface DatabaseManager {
      * @return The player's data, or an unloaded PlayerProfile if not found
      *          and createNew is false
      */
-    public PlayerProfile loadPlayerProfile(String playerName, UUID uuid, boolean createNew);
+    PlayerProfile loadPlayerProfile(String playerName, UUID uuid, boolean createNew);
 
     /**
      * Get all users currently stored in the database.
      *
      * @return list of playernames
      */
-    public List<String> getStoredUsers();
+    List<String> getStoredUsers();
 
     /**
      * Convert all users from this database to the provided database using
@@ -126,21 +126,21 @@ public interface DatabaseManager {
      *
      * @param destination The DatabaseManager to save to
      */
-    public void convertUsers(DatabaseManager destination);
+    void convertUsers(DatabaseManager destination);
 
-    public boolean saveUserUUID(String userName, UUID uuid);
+    boolean saveUserUUID(String userName, UUID uuid);
 
-    public boolean saveUserUUIDs(Map<String, UUID> fetchedUUIDs);
+    boolean saveUserUUIDs(Map<String, UUID> fetchedUUIDs);
 
     /**
      * Retrieve the type of database in use. Custom databases should return CUSTOM.
      *
      * @return The type of database
      */
-    public DatabaseType getDatabaseType();
+    DatabaseType getDatabaseType();
 
     /**
      * Called when the plugin disables
      */
-    public void onDisable();
+    void onDisable();
 }

src/main/java/com/gmail/nossr50/database/FlatfileDatabaseManager.java

@@ -22,8 +22,8 @@ import java.io.*;
 import java.util.*;
 
 public final class FlatfileDatabaseManager implements DatabaseManager {
-    private final HashMap<PrimarySkillType, List<PlayerStat>> playerStatHash = new HashMap<PrimarySkillType, List<PlayerStat>>();
-    private final List<PlayerStat> powerLevels = new ArrayList<PlayerStat>();
+    private final HashMap<PrimarySkillType, List<PlayerStat>> playerStatHash = new HashMap<>();
+    private final List<PlayerStat> powerLevels = new ArrayList<>();
     private long lastUpdate = 0;
 
     private final long UPDATE_WAIT_TIME = 600000L; // 10 minutes
@@ -36,7 +36,7 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
         updateLeaderboards();
 
         if (mcMMO.getUpgradeManager().shouldUpgrade(UpgradeType.ADD_UUIDS)) {
-            new UUIDUpdateAsyncTask(mcMMO.p, getStoredUsers()).runTaskAsynchronously(mcMMO.p);
+            new UUIDUpdateAsyncTask(mcMMO.p, getStoredUsers()).start();
         }
     }
 
@@ -425,7 +425,7 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
     public Map<PrimarySkillType, Integer> readRank(String playerName) {
         updateLeaderboards();
 
-        Map<PrimarySkillType, Integer> skills = new HashMap<PrimarySkillType, Integer>();
+        Map<PrimarySkillType, Integer> skills = new HashMap<>();
 
         for (PrimarySkillType skill : PrimarySkillType.NON_CHILD_SKILLS) {
             skills.put(skill, getPlayerRank(playerName, playerStatHash.get(skill)));
@@ -734,7 +734,7 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
                         }
 
                         character[UUID_INDEX] = fetchedUUIDs.remove(character[USERNAME]).toString();
-                        line = new StringBuilder(org.apache.commons.lang.StringUtils.join(character, ":")).append(":").toString();
+                        line = org.apache.commons.lang.StringUtils.join(character, ":") + ":";
                     }
 
                     i++;
@@ -772,7 +772,7 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
     }
 
     public List<String> getStoredUsers() {
-        ArrayList<String> users = new ArrayList<String>();
+        ArrayList<String> users = new ArrayList<>();
         BufferedReader in = null;
         String usersFilePath = mcMMO.getUsersFilePath();
 
@@ -818,19 +818,19 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
         powerLevels.clear(); // Clear old values from the power levels
 
         // Initialize lists
-        List<PlayerStat> mining = new ArrayList<PlayerStat>();
-        List<PlayerStat> woodcutting = new ArrayList<PlayerStat>();
-        List<PlayerStat> herbalism = new ArrayList<PlayerStat>();
-        List<PlayerStat> excavation = new ArrayList<PlayerStat>();
-        List<PlayerStat> acrobatics = new ArrayList<PlayerStat>();
-        List<PlayerStat> repair = new ArrayList<PlayerStat>();
-        List<PlayerStat> swords = new ArrayList<PlayerStat>();
-        List<PlayerStat> axes = new ArrayList<PlayerStat>();
-        List<PlayerStat> archery = new ArrayList<PlayerStat>();
-        List<PlayerStat> unarmed = new ArrayList<PlayerStat>();
-        List<PlayerStat> taming = new ArrayList<PlayerStat>();
-        List<PlayerStat> fishing = new ArrayList<PlayerStat>();
-        List<PlayerStat> alchemy = new ArrayList<PlayerStat>();
+        List<PlayerStat> mining = new ArrayList<>();
+        List<PlayerStat> woodcutting = new ArrayList<>();
+        List<PlayerStat> herbalism = new ArrayList<>();
+        List<PlayerStat> excavation = new ArrayList<>();
+        List<PlayerStat> acrobatics = new ArrayList<>();
+        List<PlayerStat> repair = new ArrayList<>();
+        List<PlayerStat> swords = new ArrayList<>();
+        List<PlayerStat> axes = new ArrayList<>();
+        List<PlayerStat> archery = new ArrayList<>();
+        List<PlayerStat> unarmed = new ArrayList<>();
+        List<PlayerStat> taming = new ArrayList<>();
+        List<PlayerStat> fishing = new ArrayList<>();
+        List<PlayerStat> alchemy = new ArrayList<>();
 
         BufferedReader in = null;
         String playerName = null;
@@ -881,20 +881,20 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
 
         SkillComparator c = new SkillComparator();
 
-        Collections.sort(mining, c);
-        Collections.sort(woodcutting, c);
-        Collections.sort(repair, c);
-        Collections.sort(unarmed, c);
-        Collections.sort(herbalism, c);
-        Collections.sort(excavation, c);
-        Collections.sort(archery, c);
-        Collections.sort(swords, c);
-        Collections.sort(axes, c);
-        Collections.sort(acrobatics, c);
-        Collections.sort(taming, c);
-        Collections.sort(fishing, c);
-        Collections.sort(alchemy, c);
-        Collections.sort(powerLevels, c);
+        mining.sort(c);
+        woodcutting.sort(c);
+        repair.sort(c);
+        unarmed.sort(c);
+        herbalism.sort(c);
+        excavation.sort(c);
+        archery.sort(c);
+        swords.sort(c);
+        axes.sort(c);
+        acrobatics.sort(c);
+        taming.sort(c);
+        fishing.sort(c);
+        alchemy.sort(c);
+        powerLevels.sort(c);
 
         playerStatHash.put(PrimarySkillType.MINING, mining);
         playerStatHash.put(PrimarySkillType.WOODCUTTING, woodcutting);
@@ -925,8 +925,8 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
                     in = new BufferedReader(new FileReader(usersFilePath));
                     StringBuilder writer = new StringBuilder();
                     String line;
-                    HashSet<String> usernames = new HashSet<String>();
-                    HashSet<String> players = new HashSet<String>();
+                    HashSet<String> usernames = new HashSet<>();
+                    HashSet<String> players = new HashSet<>();
 
                     while ((line = in.readLine()) != null) {
                         // Remove empty lines from the file
@@ -1196,7 +1196,7 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
                         }
 
                         if (updated) {
-                            line = new StringBuilder(org.apache.commons.lang.StringUtils.join(character, ":")).append(":").toString();
+                            line = org.apache.commons.lang.StringUtils.join(character, ":") + ":";
                         }
 
                         writer.append(line).append("\r\n");
@@ -1273,7 +1273,7 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
         return statValue;
     }
 
-    private class SkillComparator implements Comparator<PlayerStat> {
+    private static class SkillComparator implements Comparator<PlayerStat> {
         @Override
         public int compare(PlayerStat o1, PlayerStat o2) {
             return (o2.statVal - o1.statVal);
@@ -1376,7 +1376,7 @@ public final class FlatfileDatabaseManager implements DatabaseManager {
     }
 
     private Map<PrimarySkillType, Integer> getSkillMapFromLine(String[] character) {
-        Map<PrimarySkillType, Integer> skills = new EnumMap<PrimarySkillType, Integer>(PrimarySkillType.class);   // Skill & Level
+        Map<PrimarySkillType, Integer> skills = new EnumMap<>(PrimarySkillType.class);   // Skill & Level
 
         skills.put(PrimarySkillType.TAMING, Integer.valueOf(character[SKILLS_TAMING]));
         skills.put(PrimarySkillType.MINING, Integer.valueOf(character[SKILLS_MINING]));

src/main/java/com/gmail/nossr50/database/SQLDatabaseManager.java

@@ -24,9 +24,9 @@ import java.util.concurrent.locks.ReentrantLock;
 
 public final class SQLDatabaseManager implements DatabaseManager {
     private static final String ALL_QUERY_VERSION = "total";
-    private String tablePrefix = Config.getInstance().getMySQLTablePrefix();
+    private final String tablePrefix = Config.getInstance().getMySQLTablePrefix();
 
-    private final Map<UUID, Integer> cachedUserIDs = new HashMap<UUID, Integer>();
+    private final Map<UUID, Integer> cachedUserIDs = new HashMap<>();
 
     private DataSource miscPool;
     private DataSource loadPool;
@@ -34,7 +34,7 @@ public final class SQLDatabaseManager implements DatabaseManager {
 
     private boolean debug = false;
 
-    private ReentrantLock massUpdateLock = new ReentrantLock();
+    private final ReentrantLock massUpdateLock = new ReentrantLock();
 
     protected SQLDatabaseManager() {
         String connectionString = "jdbc:mysql://" + Config.getInstance().getMySQLServerName()
@@ -215,8 +215,7 @@ public final class SQLDatabaseManager implements DatabaseManager {
     }
 
     public void cleanupUser(UUID uuid) {
-        if(cachedUserIDs.containsKey(uuid))
-            cachedUserIDs.remove(uuid);
+        cachedUserIDs.remove(uuid);
     }
 
     public boolean saveUser(PlayerProfile profile) {
@@ -346,7 +345,7 @@ public final class SQLDatabaseManager implements DatabaseManager {
     }
 
     public List<PlayerStat> readLeaderboard(PrimarySkillType skill, int pageNumber, int statsPerPage) {
-        List<PlayerStat> stats = new ArrayList<PlayerStat>();
+        List<PlayerStat> stats = new ArrayList<>();
 
         String query = skill == null ? ALL_QUERY_VERSION : skill.name().toLowerCase(Locale.ENGLISH);
         ResultSet resultSet = null;
@@ -361,13 +360,13 @@ public final class SQLDatabaseManager implements DatabaseManager {
             resultSet = statement.executeQuery();
 
             while (resultSet.next()) {
-                ArrayList<String> column = new ArrayList<String>();
+                ArrayList<String> column = new ArrayList<>();
 
                 for (int i = 1; i <= resultSet.getMetaData().getColumnCount(); i++) {
                     column.add(resultSet.getString(i));
                 }
 
-                stats.add(new PlayerStat(column.get(1), Integer.valueOf(column.get(0))));
+                stats.add(new PlayerStat(column.get(1), Integer.parseInt(column.get(0))));
             }
         }
         catch (SQLException ex) {
@@ -383,7 +382,7 @@ public final class SQLDatabaseManager implements DatabaseManager {
     }
 
     public Map<PrimarySkillType, Integer> readRank(String playerName) {
-        Map<PrimarySkillType, Integer> skills = new HashMap<PrimarySkillType, Integer>();
+        Map<PrimarySkillType, Integer> skills = new HashMap<>();
 
         ResultSet resultSet = null;
         PreparedStatement statement = null;
@@ -753,7 +752,7 @@ public final class SQLDatabaseManager implements DatabaseManager {
     }
 
     public List<String> getStoredUsers() {
-        ArrayList<String> users = new ArrayList<String>();
+        ArrayList<String> users = new ArrayList<>();
 
         Statement statement = null;
         Connection connection = null;
@@ -1319,7 +1318,7 @@ public final class SQLDatabaseManager implements DatabaseManager {
     private class GetUUIDUpdatesRequired extends BukkitRunnable {
         public void run() {
             massUpdateLock.lock();
-            List<String> names = new ArrayList<String>();
+            List<String> names = new ArrayList<>();
             Connection connection = null;
             Statement statement = null;
             ResultSet resultSet = null;
@@ -1341,7 +1340,9 @@ public final class SQLDatabaseManager implements DatabaseManager {
                 }
 
                 if (!names.isEmpty()) {
-                    new UUIDUpdateAsyncTask(mcMMO.p, names).run();
+                    UUIDUpdateAsyncTask updateTask = new UUIDUpdateAsyncTask(mcMMO.p, names);
+                    updateTask.start();
+                    updateTask.waitUntilFinished();
                 }
             } finally {
                 massUpdateLock.unlock();
@@ -1489,9 +1490,8 @@ public final class SQLDatabaseManager implements DatabaseManager {
             resultSet = statement.executeQuery();
 
             if (resultSet.next()) {
-                int id = resultSet.getInt("id");
 
-                return id;
+                return resultSet.getInt("id");
             }
         }
         catch (SQLException ex) {

src/main/java/com/gmail/nossr50/datatypes/BlockSnapshot.java

@@ -9,7 +9,7 @@ import org.bukkit.block.Block;
  */
 public class BlockSnapshot {
     private final Material oldType;
-    private Block blockRef;
+    private final Block blockRef;
 
     public BlockSnapshot(Material oldType, Block blockRef) {
         this.oldType = oldType;

src/main/java/com/gmail/nossr50/datatypes/MobHealthbarType.java

@@ -3,5 +3,5 @@ package com.gmail.nossr50.datatypes;
 public enum MobHealthbarType {
     HEARTS,
     BAR,
-    DISABLED;
+    DISABLED
 }

src/main/java/com/gmail/nossr50/datatypes/chat/ChatMode.java

@@ -6,10 +6,10 @@ public enum ChatMode {
     ADMIN(LocaleLoader.getString("Commands.AdminChat.On"), LocaleLoader.getString("Commands.AdminChat.Off")),
     PARTY(LocaleLoader.getString("Commands.Party.Chat.On"), LocaleLoader.getString("Commands.Party.Chat.Off"));
 
-    private String enabledMessage;
-    private String disabledMessage;
+    private final String enabledMessage;
+    private final String disabledMessage;
 
-    private ChatMode(String enabledMessage, String disabledMessage) {
+    ChatMode(String enabledMessage, String disabledMessage) {
         this.enabledMessage  = enabledMessage;
         this.disabledMessage = disabledMessage;
     }

src/main/java/com/gmail/nossr50/datatypes/experience/SkillXpGain.java

@@ -2,6 +2,7 @@ package com.gmail.nossr50.datatypes.experience;
 
 import com.gmail.nossr50.config.experience.ExperienceConfig;
 import com.gmail.nossr50.datatypes.skills.PrimarySkillType;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.concurrent.Delayed;
 import java.util.concurrent.TimeUnit;
@@ -40,7 +41,7 @@ public class SkillXpGain implements Delayed {
     }
 
     @Override
-    public int compareTo(Delayed other) {
+    public int compareTo(@NotNull Delayed other) {
         if (other instanceof SkillXpGain) {
             // Use more efficient method if possible (private fields)
             return this.compareTo((SkillXpGain) other);

src/main/java/com/gmail/nossr50/datatypes/mods/CustomBlock.java

@@ -1,9 +1,9 @@
 package com.gmail.nossr50.datatypes.mods;
 
 public class CustomBlock {
-    private int xpGain;
-    private boolean canDoubleDrop;
-    private int smeltingXpGain;
+    private final int xpGain;
+    private final boolean canDoubleDrop;
+    private final int smeltingXpGain;
 
     public CustomBlock(int xpGain, boolean canDoubleDrop, int smeltingXpGain) {
         this.xpGain = xpGain;

src/main/java/com/gmail/nossr50/datatypes/mods/CustomEntity.java

@@ -3,12 +3,12 @@ package com.gmail.nossr50.datatypes.mods;
 import org.bukkit.inventory.ItemStack;
 
 public class CustomEntity {
-    private double xpMultiplier;
-    private boolean canBeTamed;
-    private int tamingXP;
-    private boolean canBeSummoned;
-    private ItemStack callOfTheWildItem;
-    private int callOfTheWildAmount;
+    private final double xpMultiplier;
+    private final boolean canBeTamed;
+    private final int tamingXP;
+    private final boolean canBeSummoned;
+    private final ItemStack callOfTheWildItem;
+    private final int callOfTheWildAmount;
 
     public CustomEntity(double xpMultiplier, boolean canBeTamed, int tamingXP, boolean canBeSummoned, ItemStack callOfTheWildItem, int callOfTheWildAmount) {
         this.xpMultiplier = xpMultiplier;