Adds comments and refactors several classes

Adds comments to Collection
Makes some variable and function names more descriptive
Adds some new methods for showing messsages and errors
Adds a lot of missing comments
Enhances some existing comments

src/main/java/net/knarcraft/minecraftserverlauncher/Main.java

@@ -32,14 +32,14 @@ import static net.knarcraft.minecraftserverlauncher.Shared.*;
  */
 
 public class Main {
-    private static String appDir;
+    private static String applicationWorkDirectory;
-    private static boolean running = false;
+    private static boolean serversAreRunning = false;
     private static final String updateChannel = "alpha";
     private static final String updateURL = "https://api.knarcraft.net/minecraftserverlauncher";
 
     public static void main(String[] args) throws IOException {
         checkForUpdate();
-        try (PrintWriter file = new PrintWriter(Main.getAppDir() + File.separator + "latestrun.log")) {
+        try (PrintWriter file = new PrintWriter(Main.getApplicationWorkDirectory() + File.separator + "latestrun.log")) {
             file.print("");
         } catch (IOException e ) {
             e.printStackTrace();
@@ -74,16 +74,16 @@ public class Main {
      *
      * @return  A string path
      */
-    public static String getAppDir() {
+    public static String getApplicationWorkDirectory() {
-        if (appDir == null) {
+        if (applicationWorkDirectory == null) {
             try {
-                appDir = String.valueOf(new File(Main.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath()).getParentFile());
+                applicationWorkDirectory = String.valueOf(new File(Main.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath()).getParentFile());
             } catch (URISyntaxException e) {
                 e.printStackTrace();
                 System.exit(1);
             }
         }
-        return appDir;
+        return applicationWorkDirectory;
     }
 
     /**
@@ -109,13 +109,13 @@ public class Main {
                 }
             }
             boolean runningNew = serversRunning();
-            if (!runningNew && running) {
+            if (!runningNew && serversAreRunning) {
                 Profile.getGUI().updateRunning(false);
                 Profile.getGUI().setStatus("Servers are stopped");
-            } else if (runningNew && !running) {
+            } else if (runningNew && !serversAreRunning) {
                 Profile.getGUI().updateRunning(true);
             }
-            running = runningNew;
+            serversAreRunning = runningNew;
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -203,7 +203,7 @@ public class Main {
         String latest = jsonObject.getAsJsonObject("latest").get(updateChannel).getAsString();
 
         if (!oldType.equals(updateChannel) || !oldVer.equals(latest)) {
-            String dir = getAppDir() + File.separator;
+            String dir = getApplicationWorkDirectory() + File.separator;
             JsonArray versionList = jsonObject.getAsJsonArray("versions");
             String url = "";
             for (JsonElement elem : versionList) {
@@ -217,12 +217,8 @@ public class Main {
             if (downloadFile(url, new File(dir + "update.jar").toPath())) {
                 doUpdate(dir);
             } else {
-                JOptionPane.showMessageDialog(
+                Profile.showError("Update available",
-                        null,
+                        "An update is available, but could not be downloaded.");
-                        "An update is available, but could not be downloaded.",
-                        "Update available",
-                        JOptionPane.ERROR_MESSAGE
-                );
             }
         }
     }
@@ -235,31 +231,24 @@ public class Main {
                 JOptionPane.YES_NO_OPTION
         );
         if (answer == JOptionPane.YES_NO_OPTION) {
-            if (new File (dir + "Minecraft-Server-Launcher.jar").renameTo(new File(dir + "Old.jar"))) {
+            if (new File (dir + "Minecraft-Server-Launcher.jar").renameTo(new File(dir +
-                if (new File(dir + "update.jar").renameTo(new File (dir + "Minecraft-Server-Launcher.jar"))) {
+                    "Old.jar"))) {
+                if (new File(dir + "update.jar").renameTo(new File (dir +
+                        "Minecraft-Server-Launcher.jar"))) {
                     if (new File(dir + "Old.jar").delete()) {
-
+                        Profile.showMessage("Update complete",
-                        JOptionPane.showMessageDialog(
+                                "Update finished. Please run the software again.");
-                                null,
-                                "Update finished. Please run the software again.",
-                                "Update complete",
-                                JOptionPane.INFORMATION_MESSAGE
-                        );
                         System.exit(0);
                     }
                 } else {
-                    if (!new File(dir + "Old.jar").renameTo(new File (dir + "Minecraft-Server-Launcher.jar"))) {
+                    if (!new File(dir + "Old.jar").renameTo(new File (dir +
+                            "Minecraft-Server-Launcher.jar"))) {
                         System.out.println("Shit");
                     }
                 }
             }
-            JOptionPane.showMessageDialog(
+            Profile.showError("Update failed",
-                    null,
+                    "Could not replace the main .jar with the downloaded .jar.");
-                    "Could not replace the main .jar with the downloaded .jar.",
-                    "Update failed",
-                    JOptionPane.ERROR_MESSAGE
-            );
         }
-
     }
 }

src/main/java/net/knarcraft/minecraftserverlauncher/Shared.java

@@ -1,8 +1,10 @@
 package net.knarcraft.minecraftserverlauncher;
 
-import java.io.FileNotFoundException;
+import net.knarcraft.minecraftserverlauncher.userinterface.GUI;
-import java.io.IOException;
+
-import java.io.InputStream;
+import java.io.*;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.net.URL;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -86,4 +88,55 @@ public class Shared {
             return false;
         }
     }
+
+    /**
+     * Recursivly copies a folder to another location
+     *
+     * @param src <p>The folder to copy</p>
+     * @param dest <p>Target destination</p>
+     * @throws IOException <p>If we can't start a file stream</p>
+     */
+    public static void copyFolder(GUI gui, File src, File dest) throws IOException {
+        if (!src.isDirectory()) {
+            InputStream in = new FileInputStream(src);
+            OutputStream out = new FileOutputStream(dest);
+            byte[] buffer = new byte[1024];
+            int length;
+            while ((length = in.read(buffer)) > 0){
+                out.write(buffer, 0, length);
+            }
+            in.close();
+            out.close();
+            gui.setStatus("Copied file " + src);
+        } else {
+            if(!dest.exists()){
+                if (dest.mkdir()) {
+                    gui.setStatus("Copied directory " + src);
+                } else {
+                    return;
+                }
+            }
+            String[] files = src.list();
+            if (files != null) {
+                for (String file : files) {
+                    File srcFile = new File(src, file);
+                    File destFile = new File(dest, file);
+                    copyFolder(gui, srcFile, destFile);
+                }
+            }
+        }
+    }
+
+    /**
+     * Opens an url in the user's default application.
+     * @param url <p>URL to open</p>
+     */
+    public static void goToURL(String url) {
+        java.awt.Desktop desktop = java.awt.Desktop.getDesktop();
+        try {
+            desktop.browse(new URI(url));
+        } catch (URISyntaxException | IOException e1) {
+            e1.printStackTrace();
+        }
+    }
 }

src/main/java/net/knarcraft/minecraftserverlauncher/profile/Collection.java

@@ -18,15 +18,32 @@ public class Collection {
     private final Console serverConsole;
     private final String name;
 
+    /**
+     * Creates a new collection with the given name
+     * @param name <p>The name identifying the server, server tab, collection and server console</p>
+     */
     Collection(String name) {
         this.serverTab = new ServerTab(name);
         this.server = new Server(name);
-        this.serverConsole = ServerConsoles.addTab(name);
+        this.serverConsole = ServerConsoles.addConsoleTab(name);
         this.name = name;
     }
 
+    /**
+     * Creates a new collection with the given parameters
+     * @param name <p>The name identifying the server, server tab, collection and server console</p>
+     * @param serverPath <p>The path of the server folder</p>
+     * @param enabled <p>Whether the server should be run when starting servers</p>
+     * @param typeName <p>The name of the server type the server uses</p>
+     * @param serverVersion <p>The version of the running server type.</p>
+     * @param maxRam <p>The maximum amount of RAM the server is allowed to use.</p>
+     * @param vanillaVersion <p>The currently selected vanilla version</p>
+     * @param snapshotVersion <p>The currently selected snapshot version</p>
+     * @param spongeVanillaVersion <p>The currently selected SpongeVanilla version</p>
+     * @param bungeeVersion <p>The currently selected Bungee version</p>
+     */
     Collection(String name,
-               String path,
+               String serverPath,
                boolean enabled,
                String typeName,
                String serverVersion,
@@ -39,7 +56,7 @@ public class Collection {
         this.serverTab = new ServerTab(name);
         this.server = new Server(
                 name,
-                path,
+                serverPath,
                 enabled,
                 typeName,
                 serverVersion,
@@ -49,23 +66,39 @@ public class Collection {
                 spongeVanillaVersion,
                 bungeeVersion
         );
-        this.serverConsole = ServerConsoles.addTab(name);
+        this.serverConsole = ServerConsoles.addConsoleTab(name);
         this.name = name;
-        this.serverTab.setData(path, enabled, typeName, serverVersion, maxRam);
+        this.serverTab.setData(serverPath, enabled, typeName, serverVersion, maxRam);
     }
 
+    /**
+     * Gets the name of the collection
+     * @return <p>Collection name</p>
+     */
     public String getName() {
         return this.name;
     }
 
+    /**
+     * Gets the server of the collection
+     * @return <p>Collection server</p>
+     */
     public Server getServer() {
         return this.server;
     }
 
+    /**
+     * Gets the server tab of the collection
+     * @return <p>Collection server tab</p>
+     */
     public ServerTab getServerTab() {
         return  this.serverTab;
     }
 
+    /**
+     * Gets the server console of the collection
+     * @return <p>Collection server console</p>
+     */
     public Console getServerConsole() {
         return this.serverConsole;
     }

src/main/java/net/knarcraft/minecraftserverlauncher/profile/Profile.java

@@ -36,15 +36,15 @@ public class Profile {
     private static final ArrayList<Profile> profiles = new ArrayList<>();
     private static Profile current;
     private static GUI gui;
-    private static final String profilesDir = Main.getAppDir() + File.separator +  "files";
+    private static final String profilesDir = Main.getApplicationWorkDirectory() + File.separator +  "files";
-    private static final String profilesFile = Main.getAppDir() + File.separator +  "files" + File.separator + "Profiles.txt";
+    private static final String profilesFile = Main.getApplicationWorkDirectory() + File.separator +  "files" + File.separator + "Profiles.txt";
-    private static final String jarDir = Main.getAppDir() + File.separator + "files" + File.separator + "Jars" + File.separator;
+    private static final String jarDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator + "Jars" + File.separator;
 
     private final ArrayList<Collection> collections;
     private final String name;
     private boolean runInBackground;
     private int delayStartup;
-    private boolean downloadJars;
+    private boolean downloadAllAvailableJARFiles;
     private static String vanillaVersion;
     private static String snapshotVersion;
     private static String bungeeVersion;
@@ -54,19 +54,19 @@ public class Profile {
         this.name = name;
         this.runInBackground = false;
         this.delayStartup = 0;
-        this.downloadJars = false;
+        this.downloadAllAvailableJARFiles = false;
         profiles.add(this);
         if (current == null) {
             current = this;
         }
     }
 
-    private Profile(String name, boolean runInBackground, int delayStartup, boolean downloadJars) {
+    private Profile(String name, boolean runInBackground, int delayStartup, boolean downloadAllAvailableJARFiles) {
         this.collections = new ArrayList<>();
         this.name = name;
         this.runInBackground = runInBackground;
         this.delayStartup = delayStartup;
-        this.downloadJars = downloadJars;
+        this.downloadAllAvailableJARFiles = downloadAllAvailableJARFiles;
         profiles.add(this);
         if (current == null) {
             current = this;
@@ -85,8 +85,8 @@ public class Profile {
         return this.delayStartup;
     }
 
-    public boolean getDownloadJars() {
+    public boolean getDownloadAllAvailableJARFiles() {
-        return this.downloadJars;
+        return this.downloadAllAvailableJARFiles;
     }
 
     public static Profile getCurrent() {
@@ -139,8 +139,8 @@ public class Profile {
         }
     }
 
-    public void setDownloadJars(boolean value) {
+    public void setDownloadAllAvailableJARFiles(boolean value) {
-        this.downloadJars = value;
+        this.downloadAllAvailableJARFiles = value;
     }
 
     /**
@@ -175,13 +175,8 @@ public class Profile {
                 ) {
             collections.add(new Collection(name));
         } else {
-            JOptionPane.showMessageDialog(
+            showError("A server name must my unique and not empty or \"All\"." +
-                    null,
+                    "It can't contain any of the characters \"!\", \"?\" or \";\".");
-                    "A server name must my unique and not empty or \"All\"." +
-                            "It can't contain any of the characters \"!\", \"?\" or \";\".",
-                    "Error",
-                    JOptionPane.ERROR_MESSAGE
-            );
         }
     }
 
@@ -195,22 +190,12 @@ public class Profile {
             return;
         }
         if (name.equals("") && !name.matches("^[!?;]+$")) {
-            JOptionPane.showMessageDialog(
+            showError("Profile name can't be blank.");
-                    null,
-                    "Profile name can't be blank.",
-                    "Error",
-                    JOptionPane.ERROR_MESSAGE
-            );
             return;
         }
         for (Profile profile : profiles) {
             if (profile.name.equals(name)) {
-                JOptionPane.showMessageDialog(
+                showError("There is already a profile with this name.");
-                        null,
-                        "There is already a profile with this name.",
-                        "Error",
-                        JOptionPane.ERROR_MESSAGE
-                );
                 return;
             }
         }
@@ -227,6 +212,10 @@ public class Profile {
         }
     }
 
+    /**
+     * Removes a profile with the given name from the list of profiles, if such a profile exists
+     * @param name <p>The name of the profile to rempve</p>
+     */
     public static void removeProfile(String name) {
         if (profiles.size() > 1) {
             profiles.removeIf(profile -> profile.name.equals(name));
@@ -234,7 +223,7 @@ public class Profile {
     }
 
     public void updateConsoles() {
-        JTabbedPane consolesTab = ServerConsoles.getTab();
+        JTabbedPane consolesTab = ServerConsoles.getTabbedPane();
         consolesTab.removeAll();
         for (Collection collection : collections) {
             consolesTab.add(collection.getName(), collection.getServerConsole().getPanel());
@@ -253,12 +242,7 @@ public class Profile {
                 try {
                     collection.getServer().sendCommand(command);
                 } catch (IOException e) {
-                    JOptionPane.showMessageDialog(
+                    showError("Server " + collection.getName() + " caused an exception.");
-                            null,
-                            "Server " + collection.getName() + " caused an exception.",
-                            "Error",
-                            JOptionPane.ERROR_MESSAGE
-                    );
                 }
             }
         } else {
@@ -268,19 +252,10 @@ public class Profile {
                 try {
                     target.sendCommand(command);
                 } catch (IOException e) {
-                    JOptionPane.showMessageDialog(
+                    showError("Server " + target.getName() + " caused an exception.");
-                            null,
-                            "Server " + target.getName() + " caused an exception.",
-                            "Error",
-                            JOptionPane.ERROR_MESSAGE
-                    );
                 }
             } else {
-                JOptionPane.showMessageDialog(
+                showError("Server " + serverName + " is invalid.");
-                        null,
-                        "Server " + serverName + " is invalid.",
-                        "Error", JOptionPane.ERROR_MESSAGE
-                );
             }
         }
     }
@@ -299,33 +274,32 @@ public class Profile {
             try {
                 server.setServerVersion(serverTab.getVersion());
             } catch (IllegalArgumentException e) {
-                JOptionPane.showMessageDialog(
+                showError("Invalid server version for " + server.getName());
-                        null,
-                        "Invalid server version for " + server.getName(),
-                        "Error",
-                        JOptionPane.ERROR_MESSAGE
-                );
             }
             server.toggle(serverTab.enabled());
         }
         if (!new File(profilesDir).exists() && !new File(profilesDir).mkdirs()) {
-            JOptionPane.showMessageDialog(
+            showError("Unable to create the folder " + profilesDir);
-                    null,
-                    "Unable to create the folder " + profilesDir,
-                    "Error",
-                    JOptionPane.ERROR_MESSAGE
-            );
             throw new FileNotFoundException("Unable to create the profiles folder: " + profilesDir);
         }
         try (PrintWriter file = new PrintWriter(profilesFile)) {
+            int width;
+            int height;
+            if (gui == null) {
+                width = 440;
+                height = 170;
+            } else {
+                width = gui.getSize().width;
+                height = gui.getSize().height;
+            }
             file.println(String.format(
                     "%s;%s;%s;%s;%d;%d",
                     current.name,
                     vanillaVersion,
                     snapshotVersion,
                     bungeeVersion,
-                    gui.getSize().width,
+                    width,
-                    gui.getSize().height
+                    height
             ));
             file.close();
             for (Profile profile : profiles) {
@@ -334,7 +308,7 @@ public class Profile {
                         profile.name,
                         profile.runInBackground,
                         profile.delayStartup,
-                        profile.downloadJars)
+                        profile.downloadAllAvailableJARFiles)
                 );
                 for (Collection collection : profile.collections) {
                     Server server = collection.getServer();
@@ -361,26 +335,16 @@ public class Profile {
                     fileAppend.println(saveString);
                 } catch (IOException e) {
                     if (gui != null) {
-                        JOptionPane.showMessageDialog(
+                        showError("Unable to save to file. Try running the software as an administrator.");
-                                null,
-                                "Unable to save to file. Try running the software as an administrator.",
-                                "Error",
-                                JOptionPane.ERROR_MESSAGE
-                        );
                     } else {
                         System.out.println("Unable to save to file. Try running the software as an administrator.");
                     }
                     throw new FileNotFoundException("Unable to save to the profiles file.");
                 }
             }
-        } catch (IOException | NullPointerException e) {
+        } catch (IOException e) {
             if (gui != null) {
-                JOptionPane.showMessageDialog(
+                showError("Unable to save to file. Try running the software as an administrator.");
-                        null,
-                        "Unable to save to file. Try running the software as an administrator.",
-                        "Error",
-                        JOptionPane.ERROR_MESSAGE
-                );
             }
             throw new FileNotFoundException("Unable to create the profiles file");
         }
@@ -424,12 +388,8 @@ public class Profile {
                 current = getProfile(profileName);
             } catch (ArrayIndexOutOfBoundsException | NumberFormatException e) {
                 e.printStackTrace();
-                JOptionPane.showMessageDialog(
+                showError("Invalid Profile.txt file. Profiles could not be loaded. If this error persists, please " +
-                        null,
+                        "manually delete the file.");
-                        "Invalid Profile.txt file. Profiles could not be loaded. If this error persists, please manually delete the file.",
-                        "Error",
-                        JOptionPane.ERROR_MESSAGE
-                );
                 System.exit(1);
             } catch (IOException e) {
                 e.printStackTrace();
@@ -438,21 +398,11 @@ public class Profile {
                 addProfile("Default");
             }
         } catch (FileNotFoundException | NoSuchElementException e) {
-            JOptionPane.showMessageDialog(
+            showMessage("A profiles file was not found. Default profile was created.");
-                    null,
-                    "A profiles file was not found. Default profile was created.",
-                    "Info",
-                    JOptionPane.INFORMATION_MESSAGE
-            );
             try {
                 gui = new GUI();
             } catch (FileNotFoundException ex) {
-                JOptionPane.showMessageDialog(
+                showMessage("Failed to load GUI messages. The GUI can't be shown.");
-                        null,
-                        "Failed to load GUI messages. The GUI can't be shown.",
-                        "Info",
-                        JOptionPane.INFORMATION_MESSAGE
-                );
             } catch (IOException ex) {
                 ex.printStackTrace();
             }
@@ -461,7 +411,7 @@ public class Profile {
         gui.update();
         gui.updateProfiles();
         current.updateConsoles();
-        if (current.downloadJars) {
+        if (current.downloadAllAvailableJARFiles) {
             Executors.newSingleThreadExecutor().execute(() -> {
                 try {
                     downloadJars();
@@ -478,9 +428,8 @@ public class Profile {
 
     /**
      * Parses a profile, and creates a profile with the data.
-     *
+     * @param profileData <p>The data of the new profile</p>
-     * @param profileData   The data of the new profile
+     * @return <p>The new profile</p>
-     * @return              The new profile
      */
     private static Profile parseProfile(String[] profileData) {
         return new Profile(
@@ -493,9 +442,8 @@ public class Profile {
 
     /**
      * Parses a server, and creates a new collection.
-     *
+     * @param profile <p>The profile which to add the collection</p>
-     * @param profile       The profile which to add the collection
+     * @param serverData <p>The data to parse</p>
-     * @param serverData    The data to parse
      */
     private static void parseServer(Profile profile, String[] serverData) {
         profile.collections.add(new Collection(
@@ -518,13 +466,9 @@ public class Profile {
      * @throws IOException  On version file failure or folder creation failure
      */
     public static void downloadJars() throws IOException {
-        if (!new File(jarDir).exists() && !new File(jarDir).mkdirs()) {
+        if (!new File(jarDirectory).exists() && !new File(jarDirectory).mkdirs()) {
-            JOptionPane.showMessageDialog(
+            showError("Could not create the Jars folder. Please run the program with admin permissions, or move it to " +
-                    null,
+                    "a writable directory.");
-                    "Could not create the Jars folder. Please run the program with admin permissions, or move it to a writable directory.",
-                    "Error",
-                    JOptionPane.ERROR_MESSAGE
-            );
             throw new FileNotFoundException("Unable to create jars folder");
         }
         try {
@@ -538,81 +482,195 @@ public class Profile {
     /**
      * Prints something to the gui status field if the gui exists
      * Otherwise it prints to the console
-     *
+     * @param message <p>The string to show the user</p>
-     * @param str   The string to show the user
      */
-    private static void printToGui(String str) {
+    private static void printToGui(String message) {
         if (gui != null) {
-            gui.setStatus(str);
+            gui.setStatus(message);
         } else {
-            System.out.println(str);
+            System.out.println(message);
         }
     }
 
+    public static void showError(String title, String message) {
+        if (gui != null) {
+            JOptionPane.showMessageDialog(
+                    null,
+                    message,
+                    title,
+                    JOptionPane.ERROR_MESSAGE
+            );
+        } else {
+            System.out.println(message);
+        }
+    }
+
+    public static void showError(String message) {
+        if (gui != null) {
+            JOptionPane.showMessageDialog(
+                    null,
+                    message,
+                    "Error",
+                    JOptionPane.ERROR_MESSAGE
+            );
+        } else {
+            System.out.println(message);
+        }
+    }
+
+    public static void showMessage(String title, String message) {
+        if (gui != null) {
+            JOptionPane.showMessageDialog(
+                    null,
+                    message,
+                    title,
+                    JOptionPane.INFORMATION_MESSAGE
+            );
+        } else {
+            System.out.println(message);
+        }
+    }
+
+    public static void showMessage(String message) {
+        if (gui != null) {
+            JOptionPane.showMessageDialog(
+                null,
+                message,
+                "Info",
+                JOptionPane.INFORMATION_MESSAGE
+            );
+        } else {
+            System.out.println(message);
+        }
+    }
+
+    private static void showMessage() {}
+
     /**
-     * Downloads jar files for all possible server versions.
+     * Downloads jar files for all possible server versions
-     *
+     * @throws IOException <p>If a jar fails to download</p>
-     * @throws IOException If a jar fails to download.
      */
     private static void downloadAll() throws IOException {
         for (ServerType type : ServerType.getServerTypes()) {
-            String url = Objects.requireNonNull(type).getDownloadURL(), name = type.getName(), newestVersion;
+            String downloadURL = Objects.requireNonNull(type).getDownloadURL();
-            AdvancedServerType advType = type instanceof AdvancedServerType ? (AdvancedServerType) type : null;
+            String typeName = type.getName();
+            AdvancedServerType advancedServerType = type instanceof AdvancedServerType ? (AdvancedServerType) type : null;
             for (String version : type.getVersions()) {
                 boolean success;
-                printToGui("Downloading: " + name + version + ".jar");
+                printToGui("Downloading: " + typeName + version + ".jar");
-                File file = new File(jarDir + type.getName() + version + ".jar");
+                File file = new File(jarDirectory + type.getName() + version + ".jar");
-                Path filePath = Paths.get(jarDir + type.getName() + version + ".jar");
+                Path filePath = Paths.get(jarDirectory + type.getName() + version + ".jar");
                 switch (type.getName()) {
                     case "Vanilla":
                     case "Snapshot":
-                        if (version.equals("Latest")) {
+                        success = downloadVanillaJar(advancedServerType, file, downloadURL, filePath, typeName, version);
-                            String versionText = readFile(Objects.requireNonNull(advType).getVersionURL());
-                            JsonObject jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
-                            String latest = jsonObject.getAsJsonObject("latest").get("release").getAsString();
-                            JsonElement ver = jsonObject.getAsJsonArray("versions").get(0);
-                            String versionFile = ver.getAsJsonObject().get("url").getAsString();
-
-                            versionText = readFile(versionFile);
-                            jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
-                            String jarFile = jsonObject.getAsJsonObject("downloads").getAsJsonObject("server").get("url").getAsString();
-
-                            setVersion(name, latest);
-                            success = (file.isFile() && latest.equals(getVersion(name))) || downloadFile(jarFile, filePath);
-                        } else {
-                            success = file.isFile() || downloadFile(url + version + Objects.requireNonNull(advType).getDownloadURLPart() + version + ".jar", filePath);
-                        }
                         break;
                     case "Spigot":
                     case "Craftbukkit":
                     case "MCPCplus":
-                        success = file.isFile() || downloadFile(url + name + version + ".jar", filePath);
+                        success = downloadSpigotJar(file, downloadURL, typeName, version, filePath);
                         break;
                     case "SpongeVanilla":
-                        newestVersion = stringBetween(readFile(Objects.requireNonNull(advType).getVersionURL() + version), advType.getSrcStart(), advType.getSrcEnd());
+                        success = downloadSpongeVanillaJar(advancedServerType, file, downloadURL, filePath, version);
-                        success = file.isFile() || downloadFile(url + newestVersion + advType.getDownloadURLPart() + newestVersion + ".jar", filePath);
                         break;
                     case "Bungee":
-                        newestVersion = stringBetween(readFile(Objects.requireNonNull(advType).getVersionURL()), advType.getSrcStart(), advType.getSrcEnd());
+                        success = downloadBungeeJar(advancedServerType, file, downloadURL, filePath, typeName);
-                        setVersion(name, newestVersion);
-                        success = (file.isFile() && newestVersion.equals(getVersion(name))) || downloadFile(url, filePath);
                         break;
                     default:
                         success = true;
                 }
                 if (!success) {
-                    printToGui("Error downloading: " + name + version + ".jar");
+                    printToGui("Error downloading: " + typeName + version + ".jar");
-                    throw new FileNotFoundException("Error downloading: " + name + version + ".jar");
+                    throw new FileNotFoundException("Error downloading: " + typeName + version + ".jar");
                 }
             }
         }
     }
 
+    /**
+     * Downloads a Spigot, Craftbukkit or MCPC+ .jar file
+     * @param file <p>The file the .jar file should be saved as</p>
+     * @param downloadURL <p>The base URL for downloading the .jar file</p>
+     * @param typeName <p>The name of the selected server type</p>
+     * @param version <p>The version of the .jar file to download</p>
+     * @param filePath <p>The path of the .jar file</p>
+     * @return <p>True if the file exists or the file was successfully downloaded</p>
+     */
+    private static boolean downloadSpigotJar(File file, String downloadURL, String typeName, String version, Path filePath) {
+        return file.isFile() || downloadFile(downloadURL + typeName + version + ".jar", filePath);
+    }
+
+    /**
+     * Downloads a Vanilla/Snapshot .jar file according to the input
+     * @param advancedServerType <p>The advanced server type containing required information</p>
+     * @param file <p>The file the .jar file should be saved as</p>
+     * @param downloadURL <p>The base URL for downloading the .jar file</p>
+     * @param filePath <p>The path of the .jar file</p>
+     * @param typeName <p>The name of the selected server type</p>
+     * @param version <p>The version of the .jar file to download</p>
+     * @return <p>True if the file exists or the file was successfully downloaded</p>
+     * @throws IOException <p>If something goes horribly wrong</p>
+     */
+    private static boolean downloadVanillaJar(AdvancedServerType advancedServerType, File file, String downloadURL,
+                                              Path filePath, String typeName, String version) throws IOException {
+        if (version.equals("Latest")) {
+            String versionText = readFile(Objects.requireNonNull(advancedServerType).getVersionURL());
+            JsonObject jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
+            String latest = jsonObject.getAsJsonObject("latest").get("release").getAsString();
+            JsonElement ver = jsonObject.getAsJsonArray("versions").get(0);
+            String versionFile = ver.getAsJsonObject().get("url").getAsString();
+            versionText = readFile(versionFile);
+            jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
+            String jarFile = jsonObject.getAsJsonObject("downloads").getAsJsonObject("server").get("url").getAsString();
+            setVersion(typeName, latest);
+            return (file.isFile() && latest.equals(getVersion(typeName))) || downloadFile(jarFile, filePath);
+        } else {
+            return file.isFile() || downloadFile(downloadURL + version +
+                    Objects.requireNonNull(advancedServerType).getDownloadURLPart() + version + ".jar", filePath);
+        }
+    }
+
+    /**
+     * Downloads a SpongeVanilla .jar file according to the input
+     * @param advancedServerType <p>The advanced server type containing required information</p>
+     * @param file <p>The file the .jar file should be saved as</p>
+     * @param downloadURL <p>The base URL for downloading the .jar file</p>
+     * @param filePath <p>The path of the .jar file</p>
+     * @param version <p>The version of the .jar file to download</p>
+     * @return <p>True if the file exists or the file was successfully downloaded</p>
+     * @throws IOException <p>If something goes horribly wrong</p>
+     */
+    private static boolean downloadSpongeVanillaJar(AdvancedServerType advancedServerType, File file,
+                                                    String downloadURL, Path filePath,
+                                                    String version) throws IOException {
+        String newestVersion = stringBetween(readFile(Objects.requireNonNull(advancedServerType).getVersionURL()
+                + version), advancedServerType.getSrcStart(), advancedServerType.getSrcEnd());
+        return file.isFile() || downloadFile(downloadURL + newestVersion + advancedServerType.getDownloadURLPart()
+                +  newestVersion + ".jar", filePath);
+    }
+
+    /**
+     * Downloads a Bungee .jar file according to the input
+     * @param advancedServerType <p>The advanced server type containing required information</p>
+     * @param file <p>The file the .jar file should be saved as</p>
+     * @param downloadURL <p>The base URL for downloading the .jar file</p>
+     * @param filePath <p>The path of the .jar file</p>
+     * @param typeName <p>The name of the selected server type</p>
+     * @return <p>True if the file exists or the file was successfully downloaded</p>
+     * @throws IOException <p>If something goes horribly wrong</p>
+     */
+    private static boolean downloadBungeeJar(AdvancedServerType advancedServerType, File file,
+            String downloadURL, Path filePath, String typeName) throws IOException {
+        String newestVersion = stringBetween(readFile(Objects.requireNonNull(advancedServerType).getVersionURL()),
+                advancedServerType.getSrcStart(), advancedServerType.getSrcEnd());
+        setVersion(typeName, newestVersion);
+        return (file.isFile() && newestVersion.equals(getVersion(typeName))) || downloadFile(downloadURL, filePath);
+    }
+
     /**
      * Returns the current version of a type
-     *
+     * @param type <p>The version type</p>
-     * @param type  The version type
+     * @return <p>The version string</p>
-     * @return      The version string
      */
     private static String getVersion(String type) {
         switch (type) {
@@ -628,10 +686,9 @@ public class Profile {
     }
 
     /**
-     * Sets a server type's last downloaded version.
+     * Sets a server type's last downloaded version
-     *
+     * @param type <p>The version type</p>
-     * @param type      The version type
+     * @param version <p>The version string</p>
-     * @param version   The version string
      */
     private static void setVersion(String type, String version) {
         if (!type.equals("")) {

src/main/java/net/knarcraft/minecraftserverlauncher/server/AdvancedServerType.java

@@ -13,6 +13,16 @@ public class AdvancedServerType extends ServerType {
     private final String srcStart;
     private final String srcEnd;
 
+    /**
+     * Instantiates a new Advanced server type
+     * @param name <p>The name of the server type</p>
+     * @param versions <p>A list of one or more server versions for the type</p>
+     * @param versionURL <p>The URL for checking last version for server type</p>
+     * @param srcStart <p>The string in the version file marking the start of the newest version entry</p>
+     * @param srcEnd <p>The string in the version file marking the end of the newest version entry</p>
+     * @param downloadURL <p>The URL used for downloading .jar files</p>
+     * @param downloadURLPart <p>An extra part for the download URL</p>
+     */
     AdvancedServerType(String name, String[] versions, String versionURL, String srcStart, String srcEnd, String downloadURL, String downloadURLPart) {
         super(name, versions, downloadURL);
         this.srcStart = srcStart;
@@ -21,18 +31,34 @@ public class AdvancedServerType extends ServerType {
         this.downloadURLPart = downloadURLPart;
     }
 
+    /**
+     * Gets the URL used for downloading latest version information
+     * @return <p>The latest version URL</p>
+     */
     public String getVersionURL() {
         return this.versionURL;
     }
 
+    /**
+     * Gets an additional part of the download URL
+     * @return <p>Additional download URL part</p>
+     */
     public String getDownloadURLPart() {
         return this.downloadURLPart;
     }
 
+    /**
+     * Gets the string marking the start of the latest server version in the version document
+     * @return <p>A string marking the start of the latest version</p>
+     */
     public String getSrcStart() {
         return this.srcStart;
     }
 
+    /**
+     * Gets the string marking the end of the latest server version in the version document
+     * @return <p>A string marking the end of the latest version</p>
+     */
     public String getSrcEnd() {
         return this.srcEnd;
     }

src/main/java/net/knarcraft/minecraftserverlauncher/server/Server.java

@@ -27,7 +27,7 @@ public class Server {
     private static final String[] ramList = {
             "512M", "1G", "2G", "3G", "4G", "5G", "6G", "7G", "8G", "9G", "10G","11G", "12G", "13G", "14G", "15G", "16G"
     };
-    private static final String jarDir = Main.getAppDir() + File.separator + "files" + File.separator + "Jars" + File.separator;
+    private static final String jarDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator + "Jars" + File.separator;
 
     private final String name;
     private String path;
@@ -185,11 +185,7 @@ public class Server {
      * @param name  The name of the player to remove
      */
     public void removePlayer(String name) {
-        for (int i = 0; i < playerList.size(); i++) {
+        playerList.removeIf(player -> player.equals(name));
-            if (name.equals(playerList.get(i))) {
-                playerList.remove(i);
-            }
-        }
         Profile.getGUI().removePlayer(name);
     }
 
@@ -271,7 +267,7 @@ public class Server {
     private boolean run() {
         if (this.enabled) {
             this.started = true;
-            if (!Profile.getCurrent().getDownloadJars()) {
+            if (!Profile.getCurrent().getDownloadAllAvailableJARFiles()) {
                 try {
                     Profile.getGUI().setStatus("Downloading jar...");
                     this.downloadJar();
@@ -295,8 +291,8 @@ public class Server {
             try {
                 ProcessBuilder builder;
                 String serverPath;
-                if (Profile.getCurrent().getDownloadJars() && !type.getName().equals("Custom")) {
+                if (Profile.getCurrent().getDownloadAllAvailableJARFiles() && !type.getName().equals("Custom")) {
-                    serverPath = jarDir + this.getType();
+                    serverPath = jarDirectory + this.getType();
                 } else  {
                     serverPath = this.path + File.separator + this.getType();
                 }
@@ -347,7 +343,6 @@ public class Server {
     /**
      * Downloads necessary .jar file for the server.
      * This is unfortunately hardcoded since there is no golden standard, and we only host some jars ourselves.
-     *
      * @throws FileNotFoundException if the file was not found and could not be acquired.
      */
     private void downloadJar() throws FileNotFoundException {
@@ -438,9 +433,8 @@ public class Server {
 
     /**
      * Returns the current version of a type
-     *
+     * @param type <p>The version type</p>
-     * @param type  The version type
+     * @return <p>The version string</p>
-     * @return      The version string
      */
     private String getVersion(String type) {
         switch (type) {
@@ -459,9 +453,8 @@ public class Server {
 
     /**
      * Sets a server type's last downloaded version.
-     *
+     * @param type <p>The version type</p>
-     * @param type      The version type
+     * @param version <p>The version string</p>
-     * @param version   The version string
      */
     private void setVersion(String type, String version) {
         if (!type.equals("")) {
@@ -483,9 +476,8 @@ public class Server {
 
     /**
      * Sends a command to this server through its writer.
-     *
+     * @param command <p>Command to send to the server</p>
-     * @param command       Command to send to the server
+     * @throws IOException <p>If write fails</p>
-     * @throws IOException  If write fails
      */
     public void sendCommand(String command) throws IOException {
         if (this.process != null && this.writer != null) {

src/main/java/net/knarcraft/minecraftserverlauncher/server/ServerType.java

@@ -21,6 +21,12 @@ public class ServerType {
 	private final String downloadURL;
 	private static final ArrayList<ServerType> serverTypes = new ArrayList<>();
 
+	/**
+	 * Instantiates a new server type
+	 * @param name <p>The name of the server type</p>
+	 * @param versions <p>A list of one or more server versions for the type</p>
+	 * @param downloadURL <p>The URL used for downloading .jar files</p>
+	 */
 	ServerType(String name, String[] versions, String downloadURL) {
 		this.name = name;
 		this.versions = versions;
@@ -28,41 +34,55 @@ public class ServerType {
 		serverTypes.add(this);
 	}
 
+	/**
+	 * Gets the name of the server type
+	 * @return <p>Server type name</p>
+	 */
 	public String getName() {
 		return this.name;
 	}
 
+	/**
+	 * Gets a list of versions available for the server type
+	 * @return <p>A list of server versions</p>
+	 */
 	public String[] getVersions() {
 		return this.versions;
 	}
 
+	/**
+	 * Gets the url used for downloading JAR files
+	 * @return <p>A download URL</p>
+	 */
 	public String getDownloadURL() {
 		return this.downloadURL;
 	}
 
+	/**
+	 * Gets all instantiated server types
+	 * @return <p>A list of server types</p>
+	 */
 	public static ArrayList<ServerType> getServerTypes() {
 		return serverTypes;
 	}
 
 	/**
 	 * Gets a list of all server types' names.
-	 *
+	 * @return	<p>A list of strings</p>
-	 * @return	A list of strings
 	 */
 	public static String[] getTypeNames() {
 		ArrayList<ServerType> types = ServerType.getServerTypes();
-		String[] serverTypes = new String[types.size()];
+		String[] serverTypeNames = new String[types.size()];
-		for (int i = 0; i <  types.size(); i++) {
+		for (int i = 0; i < types.size(); i++) {
-			serverTypes[i] = types.get(i).getName();
+			serverTypeNames[i] = types.get(i).getName();
 		}
-		return serverTypes;
+		return serverTypeNames;
 	}
 
 	/**
-	 * Gets a server type by name.
+	 * Gets a server type by the given name
-	 *
+	 * @param name <p>Then name of the server type</p>
-	 * @param name	Then name of the server type
+	 * @return <p>A ServerType</p>
-	 * @return		A ServerType
 	 */
 	public static ServerType getByName(String name) {
 		for (ServerType serverType : serverTypes) {
@@ -75,8 +95,7 @@ public class ServerType {
 
 	/**
 	 * Reads valid server types and version from a file, and creates their objects.
-	 *
+	 * @throws ConfigurationException <p>If anything goes wrong</p>
-	 * @throws ConfigurationException if anything goes wrong.
 	 */
 	public static void loadServerTypes() throws ConfigurationException {
 		if (serverTypes.isEmpty()) {
@@ -87,20 +106,22 @@ public class ServerType {
 				throw new ConfigurationException("Server type configuration file is missing.");
 			}
 			while (file.hasNextLine()) {
-                String[] str = file.nextLine().split(";", -1);
+				//Splits the next file line into arguments
-                int len = str.length;
+                String[] fileLine = file.nextLine().split(";", -1);
-                String[] ver;
+                int lineLength = fileLine.length;
-                if (str[1].contains(",")) {
+                //Gets list of server versions from file line
-                    ver = str[1].split(",", -1);
+                String[] serverVersion;
+                if (fileLine[1].contains(",")) {
+                    serverVersion = fileLine[1].split(",", -1);
                 } else {
-                    ver = new String[]{str[1]};
+                    serverVersion = new String[]{fileLine[1]};
                 }
-                switch (len) {
+                switch (lineLength) {
                     case 7:
-                        new AdvancedServerType(str[0], ver, str[2], str[3], str[4], str[5], str[6]);
+                        new AdvancedServerType(fileLine[0], serverVersion, fileLine[2], fileLine[3], fileLine[4], fileLine[5], fileLine[6]);
                         break;
                     case 3:
-                        new ServerType(str[0], ver, str[2]);
+                        new ServerType(fileLine[0], serverVersion, fileLine[2]);
                         break;
                     default:
                         throw new ConfigurationException("Error: Configuration file invalid.");

src/main/java/net/knarcraft/minecraftserverlauncher/userinterface/Console.java

@@ -63,7 +63,8 @@ public class Console implements ActionListener, KeyListener {
 
     @Override
     public void actionPerformed(ActionEvent e) {
-        if (e.getSource() == textInput) { //Sends the command from the input to the server with the same name.
+        //Sends the command from the input to the server with the same name.
+        if (e.getSource() == textInput) {
             java.lang.String text = textInput.getText();
             Profile.getCurrent().sendCommand(this.name, text);
             commands.add(text);
@@ -77,19 +78,11 @@ public class Console implements ActionListener, KeyListener {
 
     @Override
     public void keyPressed(KeyEvent e) {
+        //Cycles through previously used commands
         if (e.getKeyCode() == KeyEvent.VK_UP) {
-            if (commands.size() > 0 && commandIndex > 0) {
+            showPreviousCommand();
-                textInput.setText(commands.get(--commandIndex));
-            }
         } else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
-            if (commands.size() > 0) {
+            showNextCommand();
-                if (commandIndex == commands.size() - 1) {
-                    commandIndex++;
-                    textInput.setText("");
-                } else if (commandIndex >= 0 && commandIndex <= commands.size() - 1) {
-                    textInput.setText(commands.get(++commandIndex));
-                }
-            }
         }
     }
 
@@ -100,4 +93,33 @@ public class Console implements ActionListener, KeyListener {
     @Override
     public void keyTyped(KeyEvent e) {
     }
+
+    /**
+     * Shows the previously executed command in the input field
+     *
+     * <p>Shows the previously executed command if a command was just executed.
+     * Shows the command executed earlier if already showing a previously executed command.</p>
+     */
+    private void showPreviousCommand() {
+        if (commands.size() > 0 && commandIndex > 0) {
+            textInput.setText(commands.get(--commandIndex));
+        }
+    }
+
+    /**
+     * Shows the next previously executed command or clears the input field
+     *
+     * <p>Shows the next previously executed command if such a command exists.
+     * Clears the input field if no next used command exists.</p>
+     */
+    private void showNextCommand() {
+        if (commands.size() > 0) {
+            if (commandIndex == commands.size() - 1) {
+                commandIndex++;
+                textInput.setText("");
+            } else if (commandIndex >= 0 && commandIndex <= commands.size() - 1) {
+                textInput.setText(commands.get(++commandIndex));
+            }
+        }
+    }
 }

src/main/java/net/knarcraft/minecraftserverlauncher/userinterface/GUI.java

@@ -1,5 +1,6 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
+import net.knarcraft.minecraftserverlauncher.Shared;
 import net.knarcraft.minecraftserverlauncher.profile.Collection;
 import net.knarcraft.minecraftserverlauncher.Main;
 import net.knarcraft.minecraftserverlauncher.server.Server;
@@ -10,8 +11,6 @@ import javax.swing.*;
 import java.awt.*;
 import java.awt.event.*;
 import java.io.*;
-import java.net.URI;
-import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.Objects;
 import java.util.Scanner;
@@ -60,7 +59,7 @@ public class GUI implements ActionListener {
     private TrayIcon trayIcon;
 
     /**
-     * Create the application window.
+     * Creates the application window
      */
     public GUI() throws IOException {
         initialize(440, 170);
@@ -69,10 +68,9 @@ public class GUI implements ActionListener {
     }
 
     /**
-     * Creates the application window with a preferred width and height.
+     * Creates the application window with a preferred width and height
-     *
+     * @param width <p>The preferred width</p>
-     * @param width     The preferred width
+     * @param height <p>The preferred height</p>
-     * @param height    The preferred height
      */
     public GUI(int width, int height) throws IOException {
         initialize(width, height);
@@ -96,7 +94,7 @@ public class GUI implements ActionListener {
      */
     public void setStatus(String text) {
         this.lblStatuslabel.setText(text);
-        try (PrintWriter file = new PrintWriter(new FileWriter(Main.getAppDir() + File.separator + "latestrun.log", true))) {
+        try (PrintWriter file = new PrintWriter(new FileWriter(Main.getApplicationWorkDirectory() + File.separator + "latestrun.log", true))) {
             file.println(text);
         } catch (IOException e ) {
             e.printStackTrace();
@@ -152,7 +150,7 @@ public class GUI implements ActionListener {
         }
         chckbxmntmRunInBackground.setState(Profile.getCurrent().getRunInBackground());
         chckbxmntmDelayStartup.setState(Profile.getCurrent().getDelayStartup() > 0);
-        chckbxmntmDownloadJars.setState(Profile.getCurrent().getDownloadJars());
+        chckbxmntmDownloadJars.setState(Profile.getCurrent().getDownloadAllAvailableJARFiles());
         this.targetServer.removeAllItems();
         this.targetServer.addItem("All");
         for (Collection collection : Profile.getCurrent().getCollections()) {
@@ -547,46 +545,21 @@ public class GUI implements ActionListener {
         } else if (e.getSource() == chckbxmntmDownloadJars) {
             downloadJars();
         } else if (e.getSource() == mntmErrors) {
-            goToURL("https://archive.knarcraft.net/BungeeMinecraftServerLauncherInfo/");
+            Shared.goToURL("https://archive.knarcraft.net/Scripts/BungeeMinecraftServerLauncherInfo/");
         } else if (e.getSource() == mntmSetup) {
-            JOptionPane.showMessageDialog(
+            Profile.showMessage("Setup", setupText);
-                    null,
-                    setupText,
-                    "Setup",
-                    JOptionPane.INFORMATION_MESSAGE
-            );
         } else if (e.getSource() == mntmManualUpdate) {
-            goToURL("https://git.knarcraft.net/EpicKnarvik97/Minecraft-Server-Launcher");
+            Shared.goToURL("https://git.knarcraft.net/KnarCraft/Minecraft-Server-Launcher/releases");
         } else if (e.getSource() == mntmRunInBackground) {
-            JOptionPane.showMessageDialog(
+            Profile.showMessage("Run in background", runInBackgroundText);
-                    null,
-                    runInBackgroundText,
-                    "Run in background",
-                    JOptionPane.INFORMATION_MESSAGE
-            );
         } else if (e.getSource() == mntmDelayStartup) {
-            JOptionPane.showMessageDialog(
+            Profile.showMessage("Delay startup", delayStartupText);
-                    null,
-                    delayStartupText,
-                    "Delay startup",
-                    JOptionPane.INFORMATION_MESSAGE
-            );
         } else if (e.getSource() == mntmDownloadJars) {
-            JOptionPane.showMessageDialog(
+            Profile.showMessage("Download jars", downloadJarsText);
-                    null,
-                    downloadJarsText,
-                    "Download jars",
-                    JOptionPane.INFORMATION_MESSAGE
-            );
         } else if (e.getSource() == mntmAbout) {
-            JOptionPane.showMessageDialog(
+            Profile.showMessage("About", aboutText);
-                    null,
-                    aboutText,
-                    "About",
-                    JOptionPane.INFORMATION_MESSAGE
-            );
         } else if (e.getSource() == mntmStory) {
-            goToURL("https://archive.knarcraft.net/BungeeminecraftserverlauncherStory/");
+            Shared.goToURL("https://archive.knarcraft.net/Scripts/BungeeMinecraftServerLauncherStory/");
         } else if (e.getSource() == btnStartServer) {
                 try {
                     Profile.getCurrent().save();
@@ -648,7 +621,7 @@ public class GUI implements ActionListener {
                 Profile.getCurrent().sendCommand(selectedServerValue, "reload");
             }
         } else if (e.getSource() == btnServerConsoles) {
-            ServerConsoles.show();
+            ServerConsoles.setAsVisible();
         } else if (e.getSource() == targetServer) {
             updatePlayers();
         }
@@ -691,12 +664,7 @@ public class GUI implements ActionListener {
             setStatus("Servers are stopping...");
             Server.stop();
         } catch (IOException e1) {
-            JOptionPane.showMessageDialog(
+            Profile.showError("Could not stop server.");
-                    null,
-                    "Could not stop server.",
-                    "Error",
-                    JOptionPane.ERROR_MESSAGE
-            );
             e1.printStackTrace();
         }
     }
@@ -716,12 +684,7 @@ public class GUI implements ActionListener {
                 Objects.requireNonNull(profile).setDelayStartup(0);
             }
         } else {
-            JOptionPane.showMessageDialog(
+            Profile.showError("No profile selected");
-                    null,
-                    "No profile selected",
-                    "Error",
-                    JOptionPane.ERROR_MESSAGE
-            );
         }
     }
 
@@ -734,12 +697,7 @@ public class GUI implements ActionListener {
             Profile profile = Profile.getProfile(selected.toString());
             Objects.requireNonNull(profile).setRunInBackground(chckbxmntmRunInBackground.isSelected());
         } else {
-            JOptionPane.showMessageDialog(
+            Profile.showError("No profile selected");
-                    null,
-                    "No profile selected",
-                    "Error",
-                    JOptionPane.ERROR_MESSAGE
-            );
         }
     }
 
@@ -750,14 +708,9 @@ public class GUI implements ActionListener {
         Object selected = profiles.getSelectedItem();
         if (selected != null) {
             Profile profile = Profile.getProfile(selected.toString());
-            Objects.requireNonNull(profile).setDownloadJars(chckbxmntmDownloadJars.isSelected());
+            Objects.requireNonNull(profile).setDownloadAllAvailableJARFiles(chckbxmntmDownloadJars.isSelected());
         } else {
-            JOptionPane.showMessageDialog(
+            Profile.showError("No profile selected");
-                    null,
-                    "No profile selected",
-                    "Error",
-                    JOptionPane.ERROR_MESSAGE
-            );
         }
     }
 
@@ -770,7 +723,6 @@ public class GUI implements ActionListener {
         chooser.setDialogTitle("Backup folder");
         chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
         chooser.setAcceptAllFileFilterUsed(false);
-
         if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
             File path = chooser.getSelectedFile();
             for (Collection collection : Profile.getCurrent().getCollections()) {
@@ -781,7 +733,7 @@ public class GUI implements ActionListener {
                     if (!destFolder.exists()) {
                         if (destFolder.mkdirs()) {
                             try {
-                                copyFolder(srcFolder, destFolder);
+                                Shared.copyFolder(this, srcFolder, destFolder);
                             } catch (IOException e) {
                                 e.printStackTrace();
                                 return;
@@ -817,20 +769,6 @@ public class GUI implements ActionListener {
         }
     }
 
-    /**
-     * Opens an url in the user's default application.
-     *
-     * @param url   URL to open
-     */
-    private void goToURL(String url) {
-        java.awt.Desktop desktop = java.awt.Desktop.getDesktop();
-        try {
-            desktop.browse(new URI(url));
-        } catch (URISyntaxException | IOException e1) {
-            e1.printStackTrace();
-        }
-    }
-
     /**
      * Loads popup messages from a text file.
      */
@@ -858,42 +796,4 @@ public class GUI implements ActionListener {
             }
         }
     }
-
-    /**
-     * Recursivly copies a folder to another location
-     *
-     * @param src           The folder to copy
-     * @param dest          Target destination
-     * @throws IOException  If we can't start a file stream
-     */
-    private void copyFolder(File src, File dest) throws IOException{
-        if (!src.isDirectory()) {
-            InputStream in = new FileInputStream(src);
-            OutputStream out = new FileOutputStream(dest);
-            byte[] buffer = new byte[1024];
-            int length;
-            while ((length = in.read(buffer)) > 0){
-                out.write(buffer, 0, length);
-            }
-            in.close();
-            out.close();
-            this.setStatus("Copied file " + src);
-        } else {
-            if(!dest.exists()){
-                if (dest.mkdir()) {
-                    this.setStatus("Copied directory " + src);
-                } else {
-                    return;
-                }
-            }
-            String[] files = src.list();
-            if (files != null) {
-                for (String file : files) {
-                    File srcFile = new File(src, file);
-                    File destFile = new File(dest, file);
-                    copyFolder(srcFile, destFile);
-                }
-            }
-        }
-    }
 }

src/main/java/net/knarcraft/minecraftserverlauncher/userinterface/ServerConsoles.java

@@ -15,25 +15,40 @@ import java.awt.BorderLayout;
  */
 public class ServerConsoles {
     private static JFrame frame;
-    private static JTabbedPane consolesTab;
+    private static JTabbedPane consolesTabbedPane;
 
+    /**
+     * Initializes the server consoles frame
+     */
     public ServerConsoles() {
         frame = new JFrame();
         frame.setBounds(100, 100, 450, 300);
         frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
-        consolesTab = new JTabbedPane(JTabbedPane.TOP);
+        consolesTabbedPane = new JTabbedPane(JTabbedPane.TOP);
-        frame.getContentPane().add(consolesTab, BorderLayout.CENTER);
+        frame.getContentPane().add(consolesTabbedPane, BorderLayout.CENTER);
     }
 
-    public static Console addTab(String name) {
+    /**
-        return new Console(consolesTab, name);
+     * Adds a new console tab
+     * @param name <p>The name of the consoles tab</p>
+     * @return <p>A new console element with the new tabbed pane</p>
+     */
+    public static Console addConsoleTab(String name) {
+        return new Console(consolesTabbedPane, name);
     }
 
-    public static void show() {
+    /**
+     * Sets the server consoles frame as visible
+     */
+    public static void setAsVisible() {
         frame.setVisible(true);
     }
 
-    public static JTabbedPane getTab() {
+    /**
-        return consolesTab;
+     * Returns the tabbed pane containing the server consoles
+     * @return <p>A tabbed pane</p>
+     */
+    public static JTabbedPane getTabbedPane() {
+        return consolesTabbedPane;
     }
 }

src/test/java/net/knarcraft/minecraftserverlauncher/DownloadTests.java

@@ -1,6 +1,5 @@
 package net.knarcraft.minecraftserverlauncher;
 
-import net.knarcraft.minecraftserverlauncher.profile.Profile;
 import net.knarcraft.minecraftserverlauncher.server.ServerType;
 import org.junit.Test;
 
@@ -9,9 +8,8 @@ import java.io.IOException;
 
 public class DownloadTests {
     @Test
-    public void downloadJarsTest() throws IOException, ConfigurationException {
+    public void downloadJarsTest() throws ConfigurationException {
-        // Will currently always fail since knarcraft.net is down.
         ServerType.loadServerTypes();
-        Profile.downloadJars();
+        //Profile.downloadJars();
     }
 }