Updates software version to 1.4.0

Fixes a potential NullPointerException
Adds a check to make sure the backup location has enough available space
Adds a message when calculating backup size to make it clear that the software is not frozen

.gitignore

@@ -28,4 +28,5 @@ hs_err_pid*
 
 bin/
 out/
+.idea
 *.txt

README.md

@@ -1,6 +1,13 @@
 # Minecraft-Server-Launcher
-I originally created this software in 2013 using AutoIt. Since I am now learning Java, I have recreated it in Java.
+I originally created this software in 2013 using AutoIt. After learning Java, I recreated it in Java.
 The original version can be found at: https://archive.knarcraft.net/Scripts/BungeeMinecraftServerLauncher/
-Its goal is to do everything the original does, just better. The original is 1595 lines of code repetition and dirty code. I had no prior programming experience when I first started working on the original, which is why it became such a mess.
+This version's goal is to do everything the original does, just better. The original is 1595 lines of code repetition 
+and dirty code. I had no prior programming experience when I first started working on the original, which is why it 
+became such a mess.
 
-The code is now in a fully working state. It is still missing an auto update feature, but it can be used, and is fully functional.
+The software is in a fully working stage with a functional updater. The software is still in beta because there are still
+a lot of things I want to change and small annoyances. The software is fully portable. Make sure to put it in its own
+folder as it will create lots of files.
+
+The updater will move the new version to minecraft-server-launcher.jar, so you should rename the downloaded
+file to this if it's named something else to avoid confusion.

pom.xml

@@ -126,9 +126,9 @@
             <version>2.8.5</version>
         </dependency>
         <dependency>
-            <groupId>junit</groupId>
+            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit</artifactId>
+            <artifactId>junit-jupiter-api</artifactId>
-            <version>4.11</version>
+            <version>5.7.2</version>
             <scope>test</scope>
         </dependency>
     </dependencies>

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

@@ -1,15 +1,16 @@
 package net.knarcraft.minecraftserverlauncher;
 
 import net.knarcraft.minecraftserverlauncher.profile.Collection;
-import net.knarcraft.minecraftserverlauncher.profile.Controller;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
+import net.knarcraft.minecraftserverlauncher.server.ServerHandler;
 import net.knarcraft.minecraftserverlauncher.userinterface.ServerConsoles;
 import net.knarcraft.minecraftserverlauncher.userinterface.ServerLauncherGUI;
+import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 import net.knarcraft.minecraftserverlauncher.utility.Updater;
 
 import java.awt.*;
 import java.io.File;
 import java.io.IOException;
-import java.io.PrintWriter;
 import java.net.URISyntaxException;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
@@ -20,28 +21,30 @@ import java.util.concurrent.TimeUnit;
  * A software for managing Minecraft servers.
  *
  * @author Kristian Knarvik <kristian.knarvik@knett.no>
- * @version 1.0.0
+ * @version b1.3.4
  * @since 1.0.0
  */
 
 public class Main {
     private static final String updateChannel = "beta";
     private static final String updateURL = "https://api.knarcraft.net/minecraftserverlauncher";
-    private static final Controller controller = Controller.getInstance();
+    private static final ServerLauncherController controller = ServerLauncherController.getInstance();
     private static String applicationWorkDirectory;
     private static boolean serversAreRunning = false;
     private static ServerLauncherGUI gui;
 
     public static void main(String[] args) throws IOException {
-        Updater.checkForUpdate(updateURL, updateChannel);
+        String logFile = Main.getApplicationWorkDirectory() + File.separator + "latestrun.log";
-        try (PrintWriter file = new PrintWriter(Main.getApplicationWorkDirectory() + File.separator + "latestrun.log")) {
+        CommonFunctions.writeFile(logFile, "[Info]: Starting Minecraft Server Launcher v." +
-            file.print("");
+                Updater.getCurrentVersion()[1]);
+        try {
+            Updater.checkForUpdate(updateURL, updateChannel);
         } catch (IOException e) {
-            e.printStackTrace();
+            CommonFunctions.appendFile(logFile, "[Warning]: Unable to complete update procedure: " + e.getMessage());
         }
         EventQueue.invokeLater(() -> {
             try {
-                new ServerConsoles();
+                ServerConsoles.instantiate();
                 controller.loadState();
                 gui = controller.getGUI();
                 ScheduledExecutorService exec = Executors.newSingleThreadScheduledExecutor();
@@ -57,7 +60,7 @@ public class Main {
      *
      * @return <p>The controller used by the software</p>
      */
-    public static Controller getController() {
+    public static ServerLauncherController getController() {
         return controller;
     }
 
@@ -85,6 +88,7 @@ public class Main {
         boolean runningNew = serversRunning();
         if (serversAreRunning && !runningNew) {
             //Servers stopped running
+            ServerHandler.serversStopped();
             gui.updateGUIElementsWhenServersStartOrStop(false);
             gui.setStatus("Servers are stopped");
         } else if (!serversAreRunning && runningNew) {

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

@@ -2,14 +2,16 @@ package net.knarcraft.minecraftserverlauncher.profile;
 
 import net.knarcraft.minecraftserverlauncher.Main;
 import net.knarcraft.minecraftserverlauncher.server.Server;
+import net.knarcraft.minecraftserverlauncher.server.ServerHandler;
 import net.knarcraft.minecraftserverlauncher.userinterface.ServerConsoles;
 import net.knarcraft.minecraftserverlauncher.userinterface.ServerLauncherGUI;
 import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 
 import javax.naming.ConfigurationException;
 import javax.swing.*;
-import java.io.*;
+import java.io.IOException;
 import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Keeps track of a set of servers and some user settings
@@ -21,7 +23,7 @@ import java.util.ArrayList;
 public class Profile {
 
     private static final ServerLauncherGUI serverLauncherGui = Main.getController().getGUI();
-    private final ArrayList<Collection> collections;
+    private final List<Collection> collections;
     private final String name;
     private boolean runInBackground;
     private int delayStartup;
@@ -105,7 +107,7 @@ public class Profile {
      *
      * @return <p>All collections stored by this profile</p>
      */
-    public ArrayList<Collection> getCollections() {
+    public List<Collection> getCollections() {
         return this.collections;
     }
 
@@ -230,17 +232,19 @@ public class Profile {
      */
     public static Profile fromString(String profileString) throws ConfigurationException {
         Profile profile;
-        if (profileString.contains("?")) {
+        if (profileString.equals("")) {
+            return null;
+        } else if (profileString.contains("?")) {
             String[] data = profileString.split("\\?");
             String[] profileData = data[0].split(";", -1);
             profile = parseProfile(profileData);
             if (data[1].contains("!")) {
                 String[] servers = data[1].split("!", -1);
                 for (String server : servers) {
-                    profile.collections.add(new Collection(Server.fromString(server)));
+                    profile.collections.add(new Collection(ServerHandler.fromString(server)));
                 }
             } else {
-                profile.collections.add(new Collection(Server.fromString(data[1])));
+                profile.collections.add(new Collection(ServerHandler.fromString(data[1])));
             }
         } else {
             profile = parseProfile(profileString.split(";", -1));

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

@@ -2,6 +2,7 @@ package net.knarcraft.minecraftserverlauncher.profile;
 
 import net.knarcraft.minecraftserverlauncher.Main;
 import net.knarcraft.minecraftserverlauncher.server.Server;
+import net.knarcraft.minecraftserverlauncher.server.ServerHandler;
 import net.knarcraft.minecraftserverlauncher.server.ServerTypeHandler;
 import net.knarcraft.minecraftserverlauncher.userinterface.ServerLauncherGUI;
 import net.knarcraft.minecraftserverlauncher.userinterface.ServerTab;
@@ -9,16 +10,20 @@ import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 import net.knarcraft.minecraftserverlauncher.utility.JarDownloader;
 
 import javax.naming.ConfigurationException;
-import java.io.*;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Scanner;
 import java.util.concurrent.Executors;
 
 /**
  * This class handles profiles, GUI creation and session restoration
  */
-public class Controller {
+public class ServerLauncherController {
 
     private final String workingDirectory = Main.getApplicationWorkDirectory() + File.separator + "files";
     private final String profilesFile = workingDirectory + File.separator + "Profiles.txt";
@@ -28,12 +33,14 @@ public class Controller {
     private ServerLauncherGUI serverLauncherGUI;
     private Profile currentProfile;
     private boolean downloadAllJars;
-    private static Controller controller;
+    private static ServerLauncherController controller;
+    private String javaCommand = "java";
+    private String oldJavaCommand = "java";
 
     /**
      * Instantiates a new controller
      */
-    private Controller() {
+    private ServerLauncherController() {
         this.profileList = new ArrayList<>();
     }
 
@@ -42,9 +49,9 @@ public class Controller {
      *
      * @return <p>An instance of the controller</p>
      */
-    public static Controller getInstance() {
+    public static ServerLauncherController getInstance() {
         if (controller == null) {
-            controller = new Controller();
+            controller = new ServerLauncherController();
         }
         return controller;
     }
@@ -85,6 +92,47 @@ public class Controller {
         return currentProfile.getDelayStartup();
     }
 
+    /**
+     * Gets the command for running java
+     *
+     * @return <p>The command for running Java</p>
+     */
+    public String getJavaCommand() {
+        return javaCommand;
+    }
+
+    /**
+     * Gets the command for running older versions of Java
+     *
+     * <p>The command used to run older minecraft server versions. JRE 8 should probably work.
+     * Can be just "java" or a file path.</p>
+     *
+     * @return <p>The command for running older versions of Java</p>
+     */
+    public String getOldJavaCommand() {
+        return oldJavaCommand;
+    }
+
+    /**
+     * Sets the command for running Java
+     *
+     * <p>To play on the newest version of Minecraft, this needs to be JDK 16. Can be just "java" or a file path.</p>
+     *
+     * @param javaCommand <p>The command used for running Java</p>
+     */
+    public void setJavaCommand(String javaCommand) {
+        this.javaCommand = javaCommand;
+    }
+
+    /**
+     * Sets the command for running older versions of java
+     *
+     * @param oldJavaCommand <p>The command used for running older versions of Java</p>
+     */
+    public void setOldJavaCommand(String oldJavaCommand) {
+        this.oldJavaCommand = oldJavaCommand;
+    }
+
     @Override
     public String toString() {
         int guiWidth;
@@ -96,7 +144,8 @@ public class Controller {
             guiWidth = serverLauncherGUI.getSize().width;
             guiHeight = serverLauncherGUI.getSize().height;
         }
-        return String.format("%s;%d;%d;%b", currentProfile.getName(), guiWidth, guiHeight, downloadAllJars);
+        return String.format("selectedProfile;%s\nguiWidth;%d\nguiHeight;%d\ndownloadAllJars;%b\njavaCommand;%s\noldJavaCommand;%s",
+                currentProfile.getName(), guiWidth, guiHeight, downloadAllJars, javaCommand, oldJavaCommand);
     }
 
     /**
@@ -171,37 +220,135 @@ public class Controller {
     }
 
     /**
-     * Loads data about the controller from a save string
+     * Sets the download all jars option
      *
-     * @param data <p>The save string to load</p>
+     * @param downloadAllJars <p>Whether to download all jars</p>
-     * @return <p>The currently selected profile</p>
-     * @throws IOException <p>If unable to create the GUI</p>
      */
-    private String fromString(String data) throws IOException {
+    public void setDownloadAllJars(boolean downloadAllJars) {
-        String[] dataList = data.split(";");
+        this.downloadAllJars = downloadAllJars;
-        this.downloadAllJars = Boolean.parseBoolean(dataList[3]);
+    }
-        this.serverLauncherGUI = new ServerLauncherGUI(Integer.parseInt(dataList[1]), Integer.parseInt(dataList[2]));
+
-        return dataList[0];
+    /**
+     * Sets the currently selected profile
+     *
+     * @param profileName <p>The name of the currently selected profile</p>
+     */
+    public void setCurrentProfile(String profileName) {
+        this.currentProfile = getProfileByName(profileName);
+    }
+
+    /**
+     * Gets the directory containing .jar files
+     *
+     * @return <p>The directory containing .jar files</p>
+     */
+    public String getJarDirectory() {
+        return this.jarDirectory;
+    }
+
+    /**
+     * Saves the state of the entire application to disk
+     */
+    public void saveState() {
+        saveGUIStateToServer();
+        try {
+            CommonFunctions.createAllFolders();
+            CommonFunctions.writeFile(mainFile, this.toString());
+            StringBuilder builder = new StringBuilder();
+            for (Profile profile : profileList) {
+                builder.append(profile.toString()).append("\n");
+            }
+            CommonFunctions.writeFile(profilesFile, builder.toString());
+        } catch (IOException e) {
+            serverLauncherGUI.showError("Unable to save data.");
+            e.printStackTrace();
+        }
     }
 
     /**
      * Reads profiles and servers from a text file
      */
     public void loadState() throws ConfigurationException, IOException {
+        loadState(false);
+    }
+
+    /**
+     * Reads profiles and servers from a text file
+     *
+     * @param silent <p>If silent, no GUI will be created</p>
+     */
+    public void loadState(boolean silent) throws ConfigurationException, IOException {
         //Loads data regarding this controller
         String currentProfile = null;
         if (new File(mainFile).exists()) {
-            String controllerData = CommonFunctions.readBufferedReader(new BufferedReader(new InputStreamReader(new FileInputStream(mainFile))));
+            currentProfile = this.fromString(silent);
-            currentProfile = this.fromString(controllerData);
+        } else if (!silent) {
-        } else {
             this.serverLauncherGUI = new ServerLauncherGUI();
         }
+        if (silent) {
+            return;
+        }
         //Loads all saved profiles
         loadProfiles(currentProfile);
         //Makes the GUI show the loaded data
         executeGUILoadingTasks();
     }
 
+    /**
+     * Loads data about the controller from a save string
+     *
+     * @param silent <p>If silent, no GUI will be created</p>
+     * @return <p>The currently selected profile</p>
+     */
+    private String fromString(boolean silent) {
+        Map<String, String> loadedData = new HashMap<>();
+
+        try {
+            String currentData = CommonFunctions.readFile(mainFile);
+            for (String line : currentData.split("\n")) {
+                parseSaveLine(loadedData, line);
+            }
+            this.downloadAllJars = Boolean.parseBoolean(loadedData.get("downloadAllJars"));
+
+            if (!silent) {
+                if (loadedData.get("guiWidth") != null && loadedData.get("guiHeight") != null) {
+                    this.serverLauncherGUI = new ServerLauncherGUI(Integer.parseInt(loadedData.get("guiWidth")),
+                            Integer.parseInt(loadedData.get("guiHeight")));
+                } else {
+                    this.serverLauncherGUI = new ServerLauncherGUI();
+                }
+            } else {
+                this.serverLauncherGUI = new ServerLauncherGUI(true);
+            }
+
+            if (loadedData.get("javaCommand") != null) {
+                this.javaCommand = loadedData.get("javaCommand");
+            }
+            if (loadedData.get("oldJavaCommand") != null) {
+                this.oldJavaCommand = loadedData.get("oldJavaCommand");
+            }
+            return loadedData.get("selectedProfile");
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    /**
+     * Saves one config line to the provided map
+     *
+     * @param loadedData <p>The map to save the loaded configuration to</p>
+     * @param line       <p>The line to read</p>
+     */
+    private void parseSaveLine(Map<String, String> loadedData, String line) {
+        String[] lineData = line.split(";");
+        if (lineData.length != 2) {
+            return;
+        }
+
+        loadedData.put(lineData[0], lineData[1]);
+    }
+
     /**
      * Loads all saved profiles
      *
@@ -213,6 +360,9 @@ public class Controller {
             while (in.hasNextLine()) {
                 String profileData = in.nextLine();
                 Profile loadedProfile = Profile.fromString(profileData);
+                if (loadedProfile == null) {
+                    continue;
+                }
                 profileList.add(loadedProfile);
             }
         } catch (FileNotFoundException e) {
@@ -243,50 +393,11 @@ public class Controller {
             });
         }
         if (this.currentProfile.getRunInBackground()) {
-            Executors.newSingleThreadExecutor().execute(Server::startServers);
+            Executors.newSingleThreadExecutor().execute(ServerHandler::startServers);
             this.serverLauncherGUI.hideToTray();
         }
     }
 
-    /**
-     * Sets the download all jars option
-     *
-     * @param downloadAllJars <p>Whether to download all jars</p>
-     */
-    public void setDownloadAllJars(boolean downloadAllJars) {
-        this.downloadAllJars = downloadAllJars;
-    }
-
-    /**
-     * Sets the currently selected profile
-     *
-     * @param profileName <p>The name of the currently selected profile</p>
-     */
-    public void setCurrentProfile(String profileName) {
-        this.currentProfile = getProfileByName(profileName);
-    }
-
-    /**
-     * Saves the state of the entire application to disk
-     */
-    public void saveState() {
-        saveGUIStateToServer();
-        try {
-            CommonFunctions.createAllFolders();
-            PrintWriter mFile = new PrintWriter(mainFile);
-            mFile.println(this.toString());
-            mFile.close();
-            PrintWriter pFile = new PrintWriter(profilesFile);
-            for (Profile profile : profileList) {
-                pFile.println(profile.toString());
-            }
-            pFile.close();
-        } catch (FileNotFoundException e) {
-            serverLauncherGUI.showError("Unable to save data.");
-            e.printStackTrace();
-        }
-    }
-
     /**
      * Updates the server object with the current state of the GUI server tab
      */

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

@@ -1,9 +1,9 @@
 package net.knarcraft.minecraftserverlauncher.server;
 
 import net.knarcraft.minecraftserverlauncher.Main;
-import net.knarcraft.minecraftserverlauncher.profile.Collection;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
-import net.knarcraft.minecraftserverlauncher.profile.Controller;
 import net.knarcraft.minecraftserverlauncher.server.servertypes.ServerType;
+import net.knarcraft.minecraftserverlauncher.userinterface.ServerLauncherGUI;
 import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 
 import javax.naming.ConfigurationException;
@@ -19,8 +19,8 @@ import java.util.List;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
-
+import java.util.regex.Matcher;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.stringBetween;
+import java.util.regex.Pattern;
 
 
 /**
@@ -31,14 +31,9 @@ import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.stri
  * @since 1.0.0
  */
 public class Server {
-    /**
+
-     * Available ram sizes. For ServerLauncherGUI combo
-     */
-    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 jarDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" +
             File.separator + "Jars" + File.separator;
-
     private final String name;
     private final ArrayList<String> playerList;
     private String path;
@@ -51,6 +46,7 @@ public class Server {
     private BufferedReader reader;
     private boolean started;
     private ScheduledExecutorService consoleOutputExecutor;
+    private final ServerLauncherGUI gui = Main.getController().getGUI();
 
     /**
      * Initializes a new server with default values
@@ -64,7 +60,7 @@ public class Server {
         this.playerList = new ArrayList<>();
         this.type = null;
         this.serverVersion = "";
-        this.maxRam = ramList[0];
+        this.maxRam = ServerHandler.getRamList()[0];
         this.process = null;
         this.writer = null;
         this.reader = null;
@@ -90,15 +86,6 @@ public class Server {
         this.playerList = new ArrayList<>();
     }
 
-    /**
-     * Gets the list of available RAM choices allowed
-     *
-     * @return <p>All available RAM choices</p>
-     */
-    public static String[] getRamList() {
-        return ramList;
-    }
-
     /**
      * Gets the buffered reader used to read from this server
      *
@@ -108,58 +95,6 @@ public class Server {
         return this.reader;
     }
 
-    /**
-     * Tries to stop all enabled servers
-     *
-     * @throws IOException <p>If a writer's process is already closed but not null</p>
-     */
-    public static void stop() throws IOException {
-        for (Collection collection : Main.getController().getCurrentProfile().getCollections()) {
-            Server server = collection.getServer();
-            if (server.writer != null) {
-                if (server.type.isProxy()) {
-                    server.writer.write("end\n");
-                } else {
-                    server.writer.write("stop\n");
-                }
-                server.writer.flush();
-                server.writer = null;
-                server.started = false;
-            }
-        }
-    }
-
-    /**
-     * Runs all enabled servers with their settings
-     */
-    public static void startServers() {
-        Controller controller = Main.getController();
-        controller.getGUI().setStatus("Starting servers");
-        for (Collection collection : controller.getCurrentProfile().getCollections()) {
-            if (!collection.getServer().runServer()) {
-                controller.getGUI().setStatus("An error occurred. Start aborted");
-                try {
-                    Server.stop();
-                } catch (IOException e) {
-                    e.printStackTrace();
-                }
-                controller.getGUI().updateGUIElementsWhenServersStartOrStop(false);
-                return;
-            }
-        }
-    }
-
-    /**
-     * Gets a server object from a server save string
-     *
-     * @param saveString <p>The string containing necessary data regarding the server</p>
-     * @return <p>A server in the same state it was saved in</p>
-     */
-    public static Server fromString(String saveString) throws ConfigurationException {
-        String[] data = saveString.split(";");
-        return new Server(data[0], data[1], Boolean.parseBoolean(data[2]), data[3], data[4], data[5]);
-    }
-
     /**
      * Gets the name of the server
      *
@@ -225,6 +160,42 @@ public class Server {
         }
     }
 
+    /**
+     * Gets whether this server is a proxy server
+     *
+     * <p>A proxy server is a server running BungeeCord, Waterfall or Travertine.</p>
+     *
+     * @return <p>True if this server is a proxy server</p>
+     */
+    public boolean isProxy() {
+        return this.type.isProxy();
+    }
+
+    /**
+     * Marks this server as stopped
+     */
+    public void setStopped() {
+        this.started = false;
+    }
+
+    /**
+     * Gets the writer used to write to this server
+     *
+     * @return <p>The writer used.</p>
+     */
+    public BufferedWriter getWriter() {
+        return this.writer;
+    }
+
+    /**
+     * Sets the writer used to write to this server
+     *
+     * @param writer <p>The new writer to use.</p>
+     */
+    public void setWriter(BufferedWriter writer) {
+        this.writer = writer;
+    }
+
     /**
      * Gets the path for this server's files
      *
@@ -280,9 +251,9 @@ public class Server {
     }
 
     /**
-     * Checks whether this server is fully stopped
+     * Removes all information about the server's process, writer and reader
      */
-    private void stopped() {
+    private void cleanStoppedServerValues() {
         consoleOutputExecutor.shutdown();
         process = null;
         writer = null;
@@ -330,7 +301,7 @@ public class Server {
      */
     private void addPlayer(String name) {
         this.playerList.add(name);
-        Main.getController().getGUI().getServerControlTab().addPlayer(name);
+        gui.getServerControlTab().addPlayer(name);
     }
 
     /**
@@ -340,7 +311,7 @@ public class Server {
      */
     private void removePlayer(String name) {
         playerList.removeIf(player -> player.equals(name));
-        Main.getController().getGUI().getServerControlTab().removePlayer(name);
+        gui.getServerControlTab().removePlayer(name);
     }
 
     /**
@@ -355,32 +326,62 @@ public class Server {
     /**
      * Runs a Minecraft server
      *
+     * @param skipDelay <p>Whether to skip the startup delay for this server</p>
      * @return <p>True if nothing went wrong</p>
      */
-    private boolean runServer() {
+    public boolean runServer(boolean skipDelay) {
+        if (ServerHandler.stoppingServers()) {
+            gui.logMessage("Stopping servers. Cannot start yet.");
+            return false;
+        }
         //Ignore a disabled server
         if (!this.enabled) {
             this.started = false;
             return true;
         }
         //Tries to do necessary pre-start work
-        if (!initializeJarDownload() || !delayStartup()) {
+        if (!initializeJarDownload() || (!skipDelay && !delayStartup())) {
+            gui.logError("Failed to perform startup tasks.");
             this.started = false;
             return false;
         }
+        if (ServerHandler.stoppingServers()) {
+            gui.logMessage("Stopping servers. Cannot start yet.");
+            return false;
+        }
         //Starts the server if possible
         try {
             startServerProcess();
-            Main.getController().getGUI().setStatus("Servers are running");
+            gui.setStatus("Servers are running");
             this.started = true;
             return true;
         } catch (IOException e) {
-            Main.getController().getGUI().setStatus("Could not start server");
+            gui.setStatus("Could not start server");
             this.started = false;
             return false;
         }
     }
 
+    /**
+     * Gets the correct java command to use for the selected server version
+     *
+     * @return <p>The java version to run</p>
+     */
+    private String getJavaCommand() {
+        ServerLauncherController controller = ServerLauncherController.getInstance();
+
+        if (serverVersion.toLowerCase().contains("latest")) {
+            return controller.getJavaCommand();
+        } else if (serverVersion.contains(".") && serverVersion.split("\\.").length >= 2) {
+            try {
+                if (Integer.parseInt(serverVersion.split("\\.")[1]) >= 17) {
+                    return controller.getJavaCommand();
+                }
+            } catch (NumberFormatException ignored) {}
+        }
+        return controller.getOldJavaCommand();
+    }
+
     /**
      * Starts the process running this server
      *
@@ -395,7 +396,7 @@ public class Server {
         } else {
             serverPath = jarDirectory + this.type.getName() + serverVersion + ".jar";
         }
-        builder = new ProcessBuilder("java", "-Xmx" + this.maxRam, "-Xms512M",
+        builder = new ProcessBuilder(getJavaCommand(), "-Xmx" + this.maxRam, "-Xms512M",
                 "-Djline.terminal=jline.UnsupportedTerminal", "-Dcom.mojang.eula.agree=true", "-jar", serverPath,
                 "nogui");
         builder.directory(new File(this.path));
@@ -427,14 +428,14 @@ public class Server {
             updatePlayerList(readText);
         }
         if (!getProcess().isAlive()) {
-            stopped();
+            cleanStoppedServerValues();
         }
     }
 
     /**
      * Looks for strings implying a player has joined or left, and updates the appropriate lists
      *
-     * @param text   <p>The text to search</p>
+     * @param text <p>The text to search</p>
      */
     private void updatePlayerList(String text) {
         if (!getType().isProxy()) {
@@ -461,23 +462,44 @@ public class Server {
      */
     private String getPlayer(String text, boolean joined) {
         String playerName;
+
+        String loginPattern1 = " ([A-Z0-9a-z_]+)\\[/[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+:[0-9]+] logged in";
+        String loginPattern2 = "UUID of player ([A-Z0-9a-z_]+) is";
+
+        String logoutPattern1 = "INFO]: ([A-Z0-9a-z_]+) lost connection";
+        String logoutPattern2 = " ([A-Z0-9a-z_]+) left the game";
+
         if (joined) {
-            playerName = stringBetween(text, "[Server thread/INFO]: ", " joined the game");
+            playerName = getFirstRegexCaptureGroup(loginPattern1, text);
             if (playerName.equals("")) {
-                playerName = stringBetween(text, "UUID of player ", " is ");
+                playerName = getFirstRegexCaptureGroup(loginPattern2, text);
             }
         } else {
-            playerName = stringBetween(text, "INFO]: ", " lost connection");
+            playerName = getFirstRegexCaptureGroup(logoutPattern1, text);
             if (playerName.equals("")) {
-                playerName = stringBetween(text, "[Server thread/INFO]: ", " left the game");
+                playerName = getFirstRegexCaptureGroup(logoutPattern2, text);
-            }
-            if (playerName.equals("")) {
-                playerName = stringBetween(text, "INFO]: ", " left the game");
             }
         }
         return playerName;
     }
 
+    /**
+     * Returns the first regex capture group found in a pattern
+     *
+     * @param pattern <p>The regex pattern to use</p>
+     * @param text    <p>The string to execute the pattern on</p>
+     * @return <p>The first capture group if a match is found. An empty string otherwise</p>
+     */
+    private String getFirstRegexCaptureGroup(String pattern, String text) {
+        Pattern compiledPattern = Pattern.compile(pattern);
+        Matcher patternMatcher = compiledPattern.matcher(text);
+        if (patternMatcher.find()) {
+            return patternMatcher.group(1);
+        } else {
+            return "";
+        }
+    }
+
     /**
      * Delays the server's startup for the given amount of time
      *
@@ -485,7 +507,7 @@ public class Server {
      */
     private boolean delayStartup() {
         try {
-            Main.getController().getGUI().setStatus("Delaying startup");
+            gui.setStatus("Delaying startup");
             TimeUnit.SECONDS.sleep(Main.getController().getCurrentProfile().getDelayStartup());
             return true;
         } catch (InterruptedException e) {
@@ -501,18 +523,15 @@ public class Server {
      * @return <p>True if nothing went wrong</p>
      */
     private boolean initializeJarDownload() {
-        Controller controller = Main.getController();
+        try {
-        if (!controller.getDownloadAllJars()) {
+            gui.setStatus("Downloading jar...");
-            try {
+            this.downloadJar();
-                controller.getGUI().setStatus("Downloading jar...");
+            gui.setStatus("File downloaded");
-                this.downloadJar();
+        } catch (IOException e) {
-                controller.getGUI().setStatus("File downloaded");
+            gui.setStatus("Error: Jar file could not be found, downloaded or built.");
-            } catch (IOException e) {
+            gui.logError("Unable to get required .jar file: " + e.getMessage());
-                controller.getGUI().setStatus("Error: Jar file not found");
+            this.started = false;
-                e.printStackTrace();
+            return false;
-                this.started = false;
-                return false;
-            }
         }
         return true;
     }

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

@@ -0,0 +1,151 @@
+package net.knarcraft.minecraftserverlauncher.server;
+
+import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.profile.Collection;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
+import net.knarcraft.minecraftserverlauncher.userinterface.ServerLauncherGUI;
+
+import javax.naming.ConfigurationException;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+public class ServerHandler {
+
+    /**
+     * Available ram sizes. For ServerLauncherGUI combo
+     */
+    private static final String[] ramList = {"512M", "1G", "2G", "3G", "4G", "5G", "6G", "7G", "8G", "9G", "10G",
+            "11G", "12G", "13G", "14G", "15G", "16G"};
+
+    private static boolean stoppingServers = false;
+    private static final ServerLauncherGUI gui = Main.getController().getGUI();
+
+    /**
+     * Gets the list of available RAM choices allowed
+     *
+     * @return <p>All available RAM choices</p>
+     */
+    public static String[] getRamList() {
+        return ramList;
+    }
+
+    /**
+     * Gets whether the servers are currently in the process of stopping
+     *
+     * @return <p>True if the servers are in the process of stopping.</p>
+     */
+    public static boolean stoppingServers() {
+        return stoppingServers;
+    }
+
+    /**
+     * Marks the servers as finished stopping when a stop is confirmed
+     */
+    public static void serversStopped() {
+        if (stoppingServers) {
+            stoppingServers = false;
+        }
+    }
+
+    /**
+     * Tries to stop all enabled servers
+     *
+     * @throws IOException <p>If a writer's process is already closed but not null</p>
+     */
+    public static void stop() throws IOException, InterruptedException {
+        if (stoppingServers) {
+            killServers();
+            return;
+        }
+
+        stoppingServers = true;
+        int serversRunning = 0;
+
+        for (Collection collection : Main.getController().getCurrentProfile().getCollections()) {
+            Server server = collection.getServer();
+            BufferedWriter writer = server.getWriter();
+            if (writer != null) {
+                serversRunning++;
+                if (server.isProxy()) {
+                    writer.write("end\n");
+                } else {
+                    writer.write("stop\n");
+                }
+                writer.flush();
+                server.setWriter(null);
+                server.setStopped();
+            }
+        }
+
+        if (serversRunning == 0) {
+            stoppingServers = false;
+        }
+    }
+
+    /**
+     * Kills all server processes
+     *
+     * @throws InterruptedException <p>If interrupted waiting for any of the servers to stop</p>
+     */
+    private static void killServers() throws InterruptedException {
+        for (Collection collection : Main.getController().getCurrentProfile().getCollections()) {
+            Server server = collection.getServer();
+            killServer(server);
+        }
+    }
+
+    /**
+     * Kills the given server after waiting 30 seconds for it to terminate normally
+     *
+     * @param server <p>The server to kill</p>
+     * @throws InterruptedException <p>If interrupted waiting for the server to stop</p>
+     */
+    private static void killServer(Server server) throws InterruptedException {
+        Process serverProcess = server.getProcess();
+        if (serverProcess != null) {
+            if (!serverProcess.waitFor(30, TimeUnit.SECONDS)) {
+                serverProcess.destroyForcibly();
+                serverProcess.waitFor();
+            }
+        }
+    }
+
+    /**
+     * Runs all enabled servers with their settings
+     */
+    public static void startServers() {
+        ServerLauncherController controller = Main.getController();
+        gui.setStatus("Starting servers");
+        Server previouslyStartedServer = null;
+
+        for (Collection collection : controller.getCurrentProfile().getCollections()) {
+            Server server = collection.getServer();
+            if (!server.runServer(previouslyStartedServer == null || previouslyStartedServer.isProxy())) {
+                gui.showError("An error occurred. Start aborted. Please check relevant log files.");
+                try {
+                    stop();
+                } catch (IOException | InterruptedException e) {
+                    e.printStackTrace();
+                }
+                gui.updateGUIElementsWhenServersStartOrStop(false);
+                return;
+            }
+            if (server.isEnabled()) {
+                previouslyStartedServer = server;
+            }
+        }
+    }
+
+    /**
+     * Gets a server object from a server save string
+     *
+     * @param saveString <p>The string containing necessary data regarding the server</p>
+     * @return <p>A server in the same state it was saved in</p>
+     */
+    public static Server fromString(String saveString) throws ConfigurationException {
+        String[] data = saveString.split(";");
+        return new Server(data[0], data[1], Boolean.parseBoolean(data[2]), data[3], data[4], data[5]);
+    }
+
+}

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

@@ -1,6 +1,17 @@
 package net.knarcraft.minecraftserverlauncher.server;
 
-import net.knarcraft.minecraftserverlauncher.server.servertypes.*;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.BungeeCord;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.CraftBukkit;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.Custom;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.MCPCPlus;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.Paper;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.ServerType;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.Spigot;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.SpongeForge;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.SpongeVanilla;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.Travertine;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.Vanilla;
+import net.knarcraft.minecraftserverlauncher.server.servertypes.Waterfall;
 
 import javax.naming.ConfigurationException;
 import java.io.FileNotFoundException;
@@ -76,8 +87,13 @@ public class ServerTypeHandler {
             throw new ConfigurationException("Server type configuration file is missing.");
         }
         while (file.hasNextLine()) {
+            String nextLine = file.nextLine();
+            if (nextLine.startsWith("#")) {
+                continue;
+            }
+
             //Splits the next file line into arguments
-            String[] serverTypeInfo = file.nextLine().split(";", -1);
+            String[] serverTypeInfo = nextLine.split(";", -1);
 
             //Gets list of server versions from file line
             String[] serverVersions;
@@ -118,7 +134,7 @@ public class ServerTypeHandler {
                 break;
             case "Paper":
                 newType = new Paper("Paper", false, serverVersions, serverTypeInfo[2],
-                        serverTypeInfo[3]);
+                        serverTypeInfo[3], serverTypeInfo[4], serverTypeInfo[5]);
                 break;
             case "Bungee":
                 newType = new BungeeCord("Bungee", true, serverVersions, serverTypeInfo[2],

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

@@ -3,7 +3,10 @@ package net.knarcraft.minecraftserverlauncher.server;
 import net.knarcraft.minecraftserverlauncher.Main;
 import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 
-import java.io.*;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.PrintWriter;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -19,8 +22,10 @@ public class ServerVersionContainer {
     private String bungeeVersion;
     private Map<String, String> waterfallVersions;
     private Map<String, String> travertineVersions;
+    private Map<String, String> paperVersions;
     private Map<String, String> spongeVanillaVersions;
     private Map<String, String> spongeForgeVersions;
+    private String downloadedBuildToolsVersion;
 
     /**
      * Initializes a new server version container
@@ -28,6 +33,7 @@ public class ServerVersionContainer {
     private ServerVersionContainer() {
         this.waterfallVersions = new HashMap<>();
         this.travertineVersions = new HashMap<>();
+        this.paperVersions = new HashMap<>();
         this.spongeVanillaVersions = new HashMap<>();
         this.spongeForgeVersions = new HashMap<>();
         loadState();
@@ -54,8 +60,10 @@ public class ServerVersionContainer {
         this.bungeeVersion = null;
         this.waterfallVersions = new HashMap<>();
         this.travertineVersions = new HashMap<>();
+        this.paperVersions = new HashMap<>();
         this.spongeVanillaVersions = new HashMap<>();
         this.spongeForgeVersions = new HashMap<>();
+        this.downloadedBuildToolsVersion = null;
     }
 
     @Override
@@ -65,8 +73,10 @@ public class ServerVersionContainer {
                 "bungeeVersion;" + bungeeVersion + "\n" +
                 "waterfallVersions;" + mapToString(waterfallVersions) + "\n" +
                 "travertineVersions;" + mapToString(travertineVersions) + "\n" +
+                "paperVersions;" + mapToString(paperVersions) + "\n" +
                 "spongeVanillaVersions;" + mapToString(spongeVanillaVersions) + "\n" +
-                "spongeForgeVersions;" + mapToString(spongeForgeVersions);
+                "spongeForgeVersions;" + mapToString(spongeForgeVersions) + "\n" +
+                "downloadedBuildToolsVersion;" + downloadedBuildToolsVersion;
     }
 
     /**
@@ -105,7 +115,7 @@ public class ServerVersionContainer {
                 }
             }
             file = new PrintWriter(versionFile);
-            file.println(this.toString());
+            file.println(this);
             file.close();
         } catch (IOException e) {
             e.printStackTrace();
@@ -119,8 +129,8 @@ public class ServerVersionContainer {
         if (!new File(versionFile).exists()) {
             return;
         }
-        try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(versionFile)))) {
+        try {
-            String currentData = CommonFunctions.readBufferedReader(reader);
+            String currentData = CommonFunctions.readFile(versionFile);
             for (String line : currentData.split("\n")) {
                 parseSaveLine(line);
             }
@@ -157,12 +167,18 @@ public class ServerVersionContainer {
             case "travertineVersions":
                 parseVersionsToMap(travertineVersions, variableValue);
                 break;
+            case "paperVersions":
+                parseVersionsToMap(paperVersions, variableValue);
+                break;
             case "spongeVanillaVersions":
                 parseVersionsToMap(spongeVanillaVersions, variableValue);
                 break;
             case "spongeForgeVersions":
                 parseVersionsToMap(spongeForgeVersions, variableValue);
                 break;
+            case "downloadedBuildToolsVersion":
+                downloadedBuildToolsVersion = variableValue;
+                break;
             default:
                 throw new IllegalArgumentException("Invalid key encountered in the server version file.");
         }
@@ -172,9 +188,9 @@ public class ServerVersionContainer {
      * Reads versions from a text string and updates the version map
      *
      * @param targetMap <p>The map to update</p>
-     * @param data <p>The data string to parse</p>
+     * @param data      <p>The data string to parse</p>
      */
-    private void parseVersionsToMap(Map<String,String> targetMap, String data) {
+    private void parseVersionsToMap(Map<String, String> targetMap, String data) {
         String[] versions = data.split(",");
         for (String version : versions) {
             String[] versionData = version.split("!");
@@ -282,6 +298,27 @@ public class ServerVersionContainer {
         saveState();
     }
 
+    /**
+     * Gets a specific paper version
+     *
+     * @param versionKey <p>The version to check the current version of</p>
+     * @return <p>The current paper version</p>
+     */
+    public String getPaperVersion(String versionKey) {
+        return this.paperVersions.get(versionKey);
+    }
+
+    /**
+     * Sets the current version for a given paper version
+     *
+     * @param mapKey <p>The version key to set version for</p>
+     * @param newValue <p>The new current version</p>
+     */
+    public void setPaperVersion(String mapKey, String newValue) {
+        this.paperVersions.put(mapKey, newValue);
+        saveState();
+    }
+
     /**
      * Gets a specific sponge vanilla version
      *
@@ -323,5 +360,25 @@ public class ServerVersionContainer {
         spongeForgeVersions.put(mapKey, newValue);
         saveState();
     }
+
+    /**
+     * Gets the version of the downloaded BuildTools file
+     *
+     * @return <p>The version of the downloaded BuildTools file</p>
+     */
+    public String getDownloadedBuildToolsVersion() {
+        return this.downloadedBuildToolsVersion;
+    }
+
+    /**
+     * Sets the version of the downloaded BuildTools file
+     *
+     * @param newValue <p>The new version</p></p>
+     */
+    public void setDownloadedBuildToolsVersion(String newValue) {
+        this.downloadedBuildToolsVersion = newValue;
+        saveState();
+    }
+
 }
 

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/BungeeCord.java

@@ -7,7 +7,7 @@ import java.io.IOException;
 import java.nio.file.Paths;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readRemoteFile;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.stringBetween;
 
 /**
@@ -65,7 +65,7 @@ public class BungeeCord extends AbstractServerType {
     private boolean downloadLatestJar(File filePath) throws IOException {
         ServerVersionContainer versionContainer = ServerVersionContainer.getInstance();
 
-        String newestVersion = stringBetween(readFile(versionURL), srcStart, srcEnd);
+        String newestVersion = stringBetween(readRemoteFile(versionURL), srcStart, srcEnd);
         String oldVersion = versionContainer.getBungeeVersion();
         //The file is already the newest version
         if (filePath.isFile() && newestVersion.equals(oldVersion)) {

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/CraftBukkit.java

@@ -1,5 +1,10 @@
 package net.knarcraft.minecraftserverlauncher.server.servertypes;
 
+import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
+import net.knarcraft.minecraftserverlauncher.userinterface.GUI;
+import net.knarcraft.minecraftserverlauncher.utility.JarBuilder;
+
 import java.io.File;
 import java.nio.file.Paths;
 
@@ -31,7 +36,31 @@ public class CraftBukkit extends AbstractServerType {
         String targetFile = this.getName() + version + ".jar";
         String file = downloadURLPart + version + ".jar";
         File filePath = new File(folder + targetFile);
-        return filePath.isFile() || downloadFile(downloadURL + file, Paths.get(filePath.toURI()));
+
+        if (version.equals("Latest")) {
+            return filePath.isFile() || buildJar(folder);
+        } else {
+            return filePath.isFile() || downloadFile(downloadURL + file, Paths.get(filePath.toURI()));
+        }
+    }
+
+    /**
+     * Builds the necessary .jar file
+     *
+     * @param folder <p>The folder the build file should be moved to</p>
+     * @return <p>True if the build was successful</p>
+     */
+    private boolean buildJar(String folder) {
+        String buildToolsDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator +
+                "BuildTools" + File.separator;
+
+        GUI gui = ServerLauncherController.getInstance().getGUI();
+        JarBuilder jarBuilder = new JarBuilder(buildToolsDirectory, folder, gui);
+        if (this instanceof Spigot) {
+            return jarBuilder.buildSpigotJar();
+        } else {
+            return jarBuilder.buildBukkitJar();
+        }
     }
 
 }

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/Paper.java

@@ -3,19 +3,25 @@ package net.knarcraft.minecraftserverlauncher.server.servertypes;
 /**
  * This class represents the Paper Minecraft server type
  */
-public class Paper extends Spigot {
+public class Paper extends Waterfall {
 
     /**
      * Instantiates a new Paper server type
      *
-     * @param typeName        <p>The name of the server type</p>
+     * @param typeName    <p>The name of the server type</p>
-     * @param isProxy         <p>Whether this server type is a proxy server</p>
+     * @param isProxy     <p>Whether this server type is a proxy server</p>
-     * @param versions        <p>A list of one or more server versions for the type</p>
+     * @param versions    <p>The available versions for the server type</p>
-     * @param downloadURL     <p>The URL used for downloading .jar files</p>
+     * @param versionURL  <p>The URL used to finding the newest version</p>
-     * @param downloadURLPart <p>A string used after the download url as an additional part of the URL</p>
+     * @param srcStart    <p>The string after which the version id starts</p>
+     * @param srcEnd      <p>The string marking the end of the version id</p>
+     * @param downloadURL <p>The URL used for downloading the latest version</p>
      */
-    public Paper(String typeName, boolean isProxy, String[] versions, String downloadURL, String downloadURLPart) {
+    public Paper(String typeName, boolean isProxy, String[] versions, String versionURL, String srcStart,
-        super(typeName, isProxy, versions, downloadURL, downloadURLPart);
+                 String srcEnd, String downloadURL) {
+        super(typeName, isProxy, versions, versionURL, srcStart, srcEnd, downloadURL);
+
+        this.oldVersionFunction = serverVersionContainer::getPaperVersion;
+        this.versionUpdateFunction = serverVersionContainer::setPaperVersion;
     }
 
 }

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/SpongeVanilla.java

@@ -20,8 +20,8 @@ public class SpongeVanilla extends AbstractServerType {
     private final String srcStart;
     private final String srcEnd;
     private final String downloadURLPart;
-    Function<String,String> oldVersionFunction;
+    Function<String, String> oldVersionFunction;
-    BiConsumer<String,String> versionUpdateFunction;
+    BiConsumer<String, String> versionUpdateFunction;
     final ServerVersionContainer serverVersionContainer;
 
     /**
@@ -53,7 +53,7 @@ public class SpongeVanilla extends AbstractServerType {
         String file = this.getName() + version + ".jar";
         File filePath = new File(folder + file);
 
-        String versionText = CommonFunctions.readFile(versionURL + version);
+        String versionText = CommonFunctions.readRemoteFile(versionURL + version);
         String newestVersion = CommonFunctions.stringBetween(versionText, srcStart, srcEnd);
 
         String jarURL = downloadURL + newestVersion + downloadURLPart + newestVersion + ".jar";

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/Vanilla.java

@@ -12,7 +12,7 @@ import java.io.IOException;
 import java.nio.file.Paths;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readRemoteFile;
 
 /**
  * This class represents the regular vanilla Minecraft server type
@@ -54,9 +54,9 @@ public class Vanilla extends AbstractServerType {
     /**
      * Downloads the latest .jar file found if necessary
      *
-     * @param filePath    <p>The path of the jar file to download</p>
+     * @param filePath         <p>The path of the jar file to download</p>
-     * @param releaseType <p>The release type used for downloading</p>
+     * @param releaseType      <p>The release type used for downloading</p>
-     * @param lastVersion <p>The last server version found</p>
+     * @param lastVersion      <p>The last server version found</p>
      * @param versionContainer <p>The version container to use</p>
      * @return <p>True if the jar exists and is the latest version or was downloaded</p>
      * @throws IOException <p>If the .jar cannot be downloaded</p>
@@ -90,7 +90,7 @@ public class Vanilla extends AbstractServerType {
      * @throws IOException <p>If the remote resource cannot be readFromServer</p>
      */
     private String[] getLatestFile(String releaseType) throws IOException {
-        String versionText = readFile(versionURL);
+        String versionText = readRemoteFile(versionURL);
         JsonObject jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
         String latest = jsonObject.getAsJsonObject("latest").get(releaseType).getAsString();
         String versionURL = getServerFileVersionURL(latest);
@@ -106,7 +106,7 @@ public class Vanilla extends AbstractServerType {
      * @throws IOException <p>If the remote resource cannot be readFromServer</p>
      */
     private String getVanillaDownloadURL(String versionURL) throws IOException {
-        String versionText = readFile(versionURL);
+        String versionText = readRemoteFile(versionURL);
         JsonObject jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
         return jsonObject.getAsJsonObject("downloads").getAsJsonObject("server").get("url").getAsString();
     }
@@ -119,7 +119,7 @@ public class Vanilla extends AbstractServerType {
      * @throws IOException <p>If the file cannot be downloaded</p>
      */
     private String getServerFileVersionURL(String targetVersion) throws IOException {
-        String versionText = readFile(versionURL);
+        String versionText = readRemoteFile(versionURL);
         JsonObject jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
         JsonArray availableVersions = jsonObject.getAsJsonArray("versions");
         for (JsonElement availableVersion : availableVersions) {

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/Waterfall.java

@@ -9,7 +9,7 @@ import java.util.function.BiConsumer;
 import java.util.function.Function;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readRemoteFile;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.stringBetween;
 
 /**
@@ -50,7 +50,7 @@ public class Waterfall extends AbstractServerType {
     public boolean downloadJar(String folder, String version) throws IOException {
         String file = this.getName() + version + ".jar";
         File filePath = new File(folder + file);
-        String newestVersion = stringBetween(readFile(versionURL + version), srcStart, srcEnd);
+        String newestVersion = stringBetween(readRemoteFile(versionURL + version), srcStart, srcEnd);
         String fullURL = downloadURL + version + "/" + newestVersion + "/download";
         String oldVersion = oldVersionFunction.apply(version);
         //The file is already the newest version

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

@@ -0,0 +1,95 @@
+package net.knarcraft.minecraftserverlauncher.userinterface;
+
+import net.knarcraft.minecraftserverlauncher.utility.BackupUtil;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+/**
+ * The Backup GUI is used to display backup progress
+ */
+public class BackupGUI implements ActionListener {
+    private static JFrame frame;
+    private static JTextArea progressTextArea;
+    private static JProgressBar progressBar;
+    private static JButton cancelButton;
+
+    /**
+     * Instantiates a new GUI
+     */
+    public BackupGUI() {
+        instantiate();
+    }
+
+    /**
+     * Initializes the server consoles frame
+     */
+    public void instantiate() {
+        if (frame != null) {
+            return;
+        }
+        frame = new JFrame("Running backup...");
+        frame.setBounds(100, 100, 500, 140);
+        frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
+        progressTextArea = new JTextArea();
+        progressTextArea.setEditable(false);
+        progressBar = new JProgressBar();
+        cancelButton = new JButton("Cancel");
+        JPanel panel = new JPanel();
+        panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
+        panel.add(progressTextArea);
+        panel.add(Box.createRigidArea(new Dimension(0,5)));
+        panel.add(progressBar);
+
+        JPanel buttonPane = new JPanel();
+        buttonPane.setLayout(new BoxLayout(buttonPane, BoxLayout.LINE_AXIS));
+        buttonPane.setBorder(BorderFactory.createEmptyBorder(0, 10, 10, 10));
+        buttonPane.add(Box.createHorizontalGlue());
+        buttonPane.add(cancelButton);
+        cancelButton.addActionListener(BackupGUI.this);
+
+        panel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
+        Container contentPane = frame.getContentPane();
+        contentPane.add(panel, BorderLayout.CENTER);
+        contentPane.add(buttonPane, BorderLayout.PAGE_END);
+        frame.setVisible(true);
+    }
+
+    /**
+     * Updates information about the backup progress
+     *
+     * @param infoText <p>The text to display</p>
+     * @param progressPercent <p>The new percent of the progress bar</p>
+     */
+    public static void updateProgress(String infoText, int progressPercent) {
+        if (progressTextArea != null) {
+            progressTextArea.setText(infoText);
+        }
+        if (progressBar != null) {
+            progressBar.setValue(progressPercent);
+        }
+    }
+
+    /**
+     * Destroys the backup GUI
+     */
+    public static void destroy() {
+        if (frame != null) {
+            frame.dispose();
+            frame = null;
+            progressBar = null;
+            progressTextArea = null;
+            cancelButton = null;
+        }
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent actionEvent) {
+        if (actionEvent.getSource() == cancelButton) {
+            BackupUtil.abortBackup();
+            destroy();
+        }
+    }
+}

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

@@ -5,7 +5,11 @@ import net.knarcraft.minecraftserverlauncher.Main;
 import javax.swing.*;
 import javax.swing.text.DefaultCaret;
 import java.awt.*;
-import java.awt.event.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
 import java.util.ArrayList;
 
 import static javax.swing.text.DefaultCaret.ALWAYS_UPDATE;
@@ -26,11 +30,12 @@ public class Console extends KeyAdapter implements ActionListener, KeyListener {
     private final JPanel panel;
     private final ArrayList<String> commands = new ArrayList<>();
     private int commandIndex;
+    private final int maxConsoleLines = 1000;
 
     /**
      * Instantiates a new console
      *
-     * @param tab <p>The tabbed pane used for displaying the console</p>
+     * @param tab  <p>The tabbed pane used for displaying the console</p>
      * @param name <p>The name of the console tab</p>
      */
     Console(JTabbedPane tab, String name) {
@@ -67,9 +72,33 @@ public class Console extends KeyAdapter implements ActionListener, KeyListener {
      * @param text <p>The string to print</p>
      */
     public void output(String text) {
+        int outputLines = this.textOutput.getLineCount();
+        if (outputLines > maxConsoleLines) {
+            truncateConsole(outputLines);
+        }
         this.textOutput.setText(this.textOutput.getText() + "\n" + text);
     }
 
+    /**
+     * Truncates the first 50 lines if the console output has reached the max limit
+     *
+     * @param outputLines <p>The currently readable lines in the console output field</p>
+     */
+    private void truncateConsole(int outputLines) {
+        String oldText = this.textOutput.getText();
+        String[] oldTextList = oldText.split("\n");
+        for (int i = 0; i < outputLines - maxConsoleLines + 50; i++) {
+            oldTextList[i] = "";
+        }
+        StringBuilder newTextBuilder = new StringBuilder();
+        for (String line : oldTextList) {
+            if (!line.equals("")) {
+                newTextBuilder.append(line).append("\n");
+            }
+        }
+        this.textOutput.setText(newTextBuilder.toString());
+    }
+
     @Override
     public void actionPerformed(ActionEvent e) {
         //Sends the command from the input to the server with the same name.
@@ -99,7 +128,7 @@ public class Console extends KeyAdapter implements ActionListener, KeyListener {
      * 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>
+     * Shows the command executed earlier if already showing a previously executed command</p>
      */
     private void showPreviousCommand() {
         if (commands.size() > 0 && commandIndex > 0) {
@@ -111,7 +140,7 @@ public class Console extends KeyAdapter implements ActionListener, KeyListener {
      * 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>
+     * Clears the input field if no next used command exists</p>
      */
     private void showNextCommand() {
         if (commands.size() > 0) {

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

@@ -44,6 +44,20 @@ public interface GUI {
      */
     void showMessage(String message);
 
+    /**
+     * Logs a message to the logfile
+     *
+     * @param message <p>The message to log</p>
+     */
+    void logMessage(String message);
+
+    /**
+     * Logs an error to the logfile
+     *
+     * @param error <p>The error to log</p>
+     */
+    void logError(String error);
+
     /**
      * Asks the user for a directory as a file object
      *

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

@@ -1,6 +1,13 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
+import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
+
 import javax.swing.*;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
 
 /**
  * This class handles displaying messages to the user
@@ -8,6 +15,8 @@ import javax.swing.*;
 public abstract class MessageHandler implements GUI {
 
     private final boolean silent;
+    private final BufferedWriter writer;
+    private final String logFile = Main.getApplicationWorkDirectory() + File.separator + "latestrun.log";
 
     /***
      * Initializes a new message handler
@@ -16,15 +25,42 @@ public abstract class MessageHandler implements GUI {
      */
     public MessageHandler(boolean silent) {
         this.silent = silent;
+        this.writer = new BufferedWriter(new OutputStreamWriter(System.out));
+    }
+
+    @Override
+    public void logMessage(String message) {
+        try {
+            CommonFunctions.appendFile(logFile, "[Info]: " + message);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    public void logError(String message) {
+        try {
+            CommonFunctions.appendFile(logFile, "[Error]: " + message);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
     }
 
     @Override
     public void showError(String title, String message) {
         if (silent) {
-            System.out.println(message);
+            try {
+                writer.write("[Error]: ");
+                writer.write(message);
+                writer.newLine();
+                writer.flush();
+            } catch (IOException e) {
+                System.out.println(message);
+            }
         } else {
             showJOptionPane(title, message, JOptionPane.ERROR_MESSAGE);
         }
+        logError(message);
     }
 
     @Override
@@ -35,10 +71,17 @@ public abstract class MessageHandler implements GUI {
     @Override
     public void showMessage(String title, String message) {
         if (silent) {
-            System.out.println(message);
+            try {
+                writer.write("[Info]: " + message);
+                writer.newLine();
+                writer.flush();
+            } catch (IOException e) {
+                System.out.println(message);
+            }
         } else {
             showJOptionPane(title, message, JOptionPane.INFORMATION_MESSAGE);
         }
+        logMessage(message);
     }
 
     @Override

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

@@ -17,15 +17,21 @@ public class ServerConsoles {
     private static JFrame frame;
     private static JTabbedPane consolesTabbedPane;
 
+    private ServerConsoles() {
+
+    }
+
     /**
      * Initializes the server consoles frame
      */
-    public ServerConsoles() {
+    public static void instantiate() {
-        frame = new JFrame();
+        if (frame == null || consolesTabbedPane == null) {
-        frame.setBounds(100, 100, 450, 300);
+            frame = new JFrame();
-        frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
+            frame.setBounds(100, 100, 450, 300);
-        consolesTabbedPane = new JTabbedPane(JTabbedPane.TOP);
+            frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
-        frame.getContentPane().add(consolesTabbedPane, BorderLayout.CENTER);
+            consolesTabbedPane = new JTabbedPane(JTabbedPane.TOP);
+            frame.getContentPane().add(consolesTabbedPane, BorderLayout.CENTER);
+        }
     }
 
     /**

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

@@ -1,7 +1,7 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
 import net.knarcraft.minecraftserverlauncher.profile.Collection;
-import net.knarcraft.minecraftserverlauncher.profile.Controller;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
 
 import javax.swing.*;
 import java.awt.event.ActionEvent;
@@ -25,13 +25,13 @@ public class ServerControlTab implements ActionListener {
     private JButton showConsolesButton;
     private JTextField customCommandTextField;
 
-    private Controller controller = Controller.getInstance();
+    private final ServerLauncherController controller = ServerLauncherController.getInstance();
     private final ArrayList<String> globalPlayers;
 
     /**
      * Instantiates a new server control tab
      *
-     * @param mainFrame <p>The main frame of the GUI</p>
+     * @param mainFrame      <p>The main frame of the GUI</p>
      * @param controlServers <p>The JPanel to attach the server controls to</p>
      */
     public ServerControlTab(JFrame mainFrame, JPanel controlServers) {
@@ -42,7 +42,7 @@ public class ServerControlTab implements ActionListener {
     /**
      * Initializes GUI elements for the server control tab
      *
-     * @param mainFrame <p>The main frame of the GUI</p>
+     * @param mainFrame      <p>The main frame of the GUI</p>
      * @param controlServers <p>The JPanel to attach the server controls to</p>
      */
     private void initialize(JFrame mainFrame, JPanel controlServers) {
@@ -149,7 +149,7 @@ public class ServerControlTab implements ActionListener {
     public void update() {
         this.targetServerCombo.removeAllItems();
         this.targetServerCombo.addItem("All");
-        for (Collection collection : Controller.getInstance().getCurrentProfile().getCollections()) {
+        for (Collection collection : ServerLauncherController.getInstance().getCurrentProfile().getCollections()) {
             this.targetServerCombo.addItem(collection.getName());
         }
     }
@@ -232,7 +232,7 @@ public class ServerControlTab implements ActionListener {
     /**
      * Handles command buttons acting on a specific server
      *
-     * @param actionSource <p>The object being interacted with</p>
+     * @param actionSource        <p>The object being interacted with</p>
      * @param selectedServerValue <p>The server currently selected</p>
      */
     private void handleServerCommands(Object actionSource, String selectedServerValue) {
@@ -252,7 +252,7 @@ public class ServerControlTab implements ActionListener {
     /**
      * Handles command buttons which act on a player
      *
-     * @param actionSource <p>The clicked object</p>
+     * @param actionSource        <p>The clicked object</p>
      * @param selectedServerValue <p>The server currently selected</p>
      * @param selectedPlayerValue <p>The player currently selected</p>
      */

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

@@ -2,9 +2,9 @@ package net.knarcraft.minecraftserverlauncher.userinterface;
 
 import net.knarcraft.minecraftserverlauncher.Main;
 import net.knarcraft.minecraftserverlauncher.profile.Collection;
-import net.knarcraft.minecraftserverlauncher.profile.Controller;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
-import net.knarcraft.minecraftserverlauncher.server.Server;
+import net.knarcraft.minecraftserverlauncher.server.ServerHandler;
-import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
+import net.knarcraft.minecraftserverlauncher.utility.BackupUtil;
 
 import javax.imageio.ImageIO;
 import javax.naming.ConfigurationException;
@@ -12,15 +12,14 @@ import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
-import java.awt.event.MouseAdapter;
+import java.io.File;
-import java.awt.event.MouseEvent;
+import java.io.FileNotFoundException;
-import java.awt.event.WindowAdapter;
+import java.io.IOException;
-import java.awt.event.WindowEvent;
+import java.util.HashMap;
-import java.io.*;
+import java.util.Map;
-import java.util.*;
+import java.util.Scanner;
 import java.util.concurrent.Executors;
 
-import static java.awt.Frame.NORMAL;
 import static javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.getResourceAsScanner;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.getResourceAsStream;
@@ -34,8 +33,8 @@ import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.getR
  */
 public class ServerLauncherGUI extends MessageHandler implements ActionListener, GUI {
 
-    private final JLabel lblStatuslabel = new JLabel("Servers are stopped");
+    private final JLabel lblStatusLabel = new JLabel("Servers are stopped");
-    private Controller controller;
+    private final ServerLauncherController controller;
     private Map<String, String> textStrings;
     private Tray applicationTray;
 
@@ -64,6 +63,20 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
         this.controller = Main.getController();
     }
 
+    /**
+     * Creates the application window
+     *
+     * @param silent <p>Whether to make the GUI silent (hidden, for testing)</p>
+     */
+    public ServerLauncherGUI(boolean silent) throws IOException {
+        super(silent);
+        if (!silent) {
+            initialize(440, 170);
+        }
+        loadMessages();
+        this.controller = Main.getController();
+    }
+
     /**
      * Creates the application window with a preferred width and height
      *
@@ -88,13 +101,8 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
 
     @Override
     public void setStatus(String text) {
-        this.lblStatuslabel.setText(text);
+        this.lblStatusLabel.setText(text);
-        try (PrintWriter file = new PrintWriter(new FileWriter(Main.getApplicationWorkDirectory() +
+        this.logMessage(text);
-                File.separator + "latestrun.log", true))) {
-            file.println(text);
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
     }
 
     @Override
@@ -146,7 +154,7 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
      * Updates ServerLauncherGUI according to current profile settings
      */
     public void updateWithSavedProfileData() {
-        Controller controller = Main.getController();
+        ServerLauncherController controller = Main.getController();
         serversPane.removeAll();
         serverLauncherMenu.update();
         serverControlTab.update();
@@ -158,7 +166,7 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
     /**
      * Initializes the server launcher GUI
      *
-     * @param width <p>The width of the GUI</p>
+     * @param width  <p>The width of the GUI</p>
      * @param height <p>The height of the GUI</p>
      * @throws IOException <p>If unable to load the GUI icon</p>
      */
@@ -169,7 +177,7 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
                 UnsupportedLookAndFeelException |
                 InstantiationException |
                 IllegalAccessException e
-                ) {
+        ) {
             e.printStackTrace();
         }
 
@@ -235,11 +243,11 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
         panelBasic.add(profiles);
         profiles.addActionListener(this);
 
-        sl_panel.putConstraint(SpringLayout.NORTH, lblStatuslabel, 6, SpringLayout.SOUTH, addProfileButton);
+        sl_panel.putConstraint(SpringLayout.NORTH, lblStatusLabel, 6, SpringLayout.SOUTH, addProfileButton);
-        sl_panel.putConstraint(SpringLayout.SOUTH, lblStatuslabel, -10, SpringLayout.SOUTH, panelBasic);
+        sl_panel.putConstraint(SpringLayout.SOUTH, lblStatusLabel, -10, SpringLayout.SOUTH, panelBasic);
-        sl_panel.putConstraint(SpringLayout.WEST, lblStatuslabel, 10, SpringLayout.WEST, panelBasic);
+        sl_panel.putConstraint(SpringLayout.WEST, lblStatusLabel, 10, SpringLayout.WEST, panelBasic);
-        sl_panel.putConstraint(SpringLayout.EAST, lblStatuslabel, -10, SpringLayout.EAST, panelBasic);
+        sl_panel.putConstraint(SpringLayout.EAST, lblStatusLabel, -10, SpringLayout.EAST, panelBasic);
-        panelBasic.add(lblStatuslabel);
+        panelBasic.add(lblStatusLabel);
 
         addServerButton = new JButton("Add server");
         sl_panel.putConstraint(SpringLayout.NORTH, addServerButton, 0, SpringLayout.NORTH, startServerButton);
@@ -306,12 +314,11 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
     @Override
     public void actionPerformed(ActionEvent e) {
         Object actionSource = e.getSource();
-        //Registers actions on the main tab
+        //Register actions on the main tab
         handleMainTabButtons(actionSource);
     }
 
 
-
     /**
      * Handles buttons and the combo on the main tab
      *
@@ -320,13 +327,14 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
     private void handleMainTabButtons(Object actionSource) {
         if (actionSource == startServerButton) {
             controller.saveState();
-            Executors.newSingleThreadExecutor().execute(Server::startServers);
+            Executors.newSingleThreadExecutor().execute(ServerHandler::startServers);
         } else if (actionSource == stopServerButton) {
             stopServers();
         } else if (actionSource == addServerButton) {
             addServer();
         } else if (actionSource == backupButton) {
-            CommonFunctions.backup(this);
+            //Run backup in its own thread to prevent locking up
+            Executors.newSingleThreadExecutor().execute(() -> BackupUtil.backup(this));
         } else if (actionSource == addProfileButton) {
             controller.addProfile(JOptionPane.showInputDialog("Profile name: "));
             updateProfiles();
@@ -397,10 +405,13 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
     public void stopServers() {
         try {
             setStatus("Servers are stopping...");
-            Server.stop();
+            ServerHandler.stop();
         } catch (IOException e1) {
             showError("Could not stop server.");
             e1.printStackTrace();
+        } catch (InterruptedException e) {
+            showError("Could not kill server.");
+            e.printStackTrace();
         }
     }
 

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

@@ -1,12 +1,13 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
-import net.knarcraft.minecraftserverlauncher.profile.Controller;
 import net.knarcraft.minecraftserverlauncher.profile.Profile;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
 import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 
 import javax.swing.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
+import java.io.File;
 import java.util.Objects;
 
 /**
@@ -14,11 +15,14 @@ import java.util.Objects;
  */
 public class ServerLauncherMenu implements ActionListener {
 
-    private JMenuBar menuBar;
+    private final JMenuBar menuBar;
     //Options
     private JCheckBoxMenuItem runInBackgroundCheckBoxMenuItem;
     private JCheckBoxMenuItem delayStartupCheckBoxMenuItem;
     private JCheckBoxMenuItem downloadJarsCheckBoxMenuItem;
+    private JMenuItem javaCommandMenuItem;
+    private JMenuItem oldJavaCommandMenuItem;
+    private JMenuItem deleteBuiltJarsMenuItem;
     //Help
     private JMenuItem errorsMenuItem;
     private JMenuItem setupMenuItem;
@@ -27,21 +31,24 @@ public class ServerLauncherMenu implements ActionListener {
     private JMenuItem runInBackgroundMenuItem;
     private JMenuItem delayStartupMenuItem;
     private JMenuItem downloadJarsMenuItem;
+    private JMenuItem javaCommandInfoMenuItem;
+    private JMenuItem oldJavaCommandInfoMenuItem;
+    private JMenuItem deleteBuiltJarsInfoMenuItem;
     //Info/about
     private JMenuItem aboutMenuItem;
     private JMenuItem storyMenuItem;
 
-    private Controller controller;
+    private final ServerLauncherController controller;
-    private ServerLauncherGUI serverLauncherGUI;
+    private final ServerLauncherGUI serverLauncherGUI;
 
     /**
      * Initializes a new server launcher menu
      *
-     * @param menuBar <p>The menu bar to attach items to</p>
+     * @param menuBar           <p>The menu bar to attach items to</p>
      * @param serverLauncherGUI <p>The server launcher GUI to use</p>
      */
     public ServerLauncherMenu(JMenuBar menuBar, ServerLauncherGUI serverLauncherGUI) {
-        this.controller = Controller.getInstance();
+        this.controller = ServerLauncherController.getInstance();
         this.menuBar = menuBar;
         this.serverLauncherGUI = serverLauncherGUI;
         initialize();
@@ -53,64 +60,23 @@ public class ServerLauncherMenu implements ActionListener {
     public void initialize() {
         JMenu mnOptions = new JMenu("Options");
         menuBar.add(mnOptions);
-
+        generateOptionsMenuItems(mnOptions);
-        runInBackgroundCheckBoxMenuItem = new JCheckBoxMenuItem("Run in background on exit");
-        mnOptions.add(runInBackgroundCheckBoxMenuItem);
-        runInBackgroundCheckBoxMenuItem.addActionListener(this);
-
-        delayStartupCheckBoxMenuItem = new JCheckBoxMenuItem("Delay Startup");
-        mnOptions.add(delayStartupCheckBoxMenuItem);
-        delayStartupCheckBoxMenuItem.addActionListener(this);
-
-        downloadJarsCheckBoxMenuItem = new JCheckBoxMenuItem("Download jars");
-        mnOptions.add(downloadJarsCheckBoxMenuItem);
-        downloadJarsCheckBoxMenuItem.addActionListener(this);
 
         JMenu mnHelp = new JMenu("Help");
         menuBar.add(mnHelp);
 
-        errorsMenuItem = new JMenuItem("Errors");
+        errorsMenuItem = createMenuItem("Errors", mnHelp);
-        mnHelp.add(errorsMenuItem);
+        setupMenuItem = createMenuItem("Setup", mnHelp);
-        errorsMenuItem.addActionListener(this);
+        manualUpdateMenuItem = createMenuItem("Manual update", mnHelp);
-
-        setupMenuItem = new JMenuItem("Setup");
-        mnHelp.add(setupMenuItem);
-        setupMenuItem.addActionListener(this);
-
-        manualUpdateMenuItem = new JMenuItem("Manual update");
-        mnHelp.add(manualUpdateMenuItem);
-        manualUpdateMenuItem.addActionListener(this);
 
         JMenu mnInfo = new JMenu("Info");
         menuBar.add(mnInfo);
-
+        generateInfoMenuItems(mnInfo);
-        JMenu mnOptionsInfo = new JMenu("Options");
-        mnInfo.add(mnOptionsInfo);
-
-        runInBackgroundMenuItem = new JMenuItem("Run in background on exit");
-        mnOptionsInfo.add(runInBackgroundMenuItem);
-        runInBackgroundMenuItem.addActionListener(this);
-
-        delayStartupMenuItem = new JMenuItem("Delay Startup");
-        mnOptionsInfo.add(delayStartupMenuItem);
-        delayStartupMenuItem.addActionListener(this);
-
-        downloadJarsMenuItem = new JMenuItem("Download jars");
-        mnOptionsInfo.add(downloadJarsMenuItem);
-        downloadJarsMenuItem.addActionListener(this);
-
-        JMenu mnAbout = new JMenu("About");
-        mnInfo.add(mnAbout);
-
-        aboutMenuItem = new JMenuItem("About");
-        mnAbout.add(aboutMenuItem);
-        aboutMenuItem.addActionListener(this);
-
-        storyMenuItem = new JMenuItem("Story");
-        mnAbout.add(storyMenuItem);
-        storyMenuItem.addActionListener(this);
     }
 
+    /**
+     * Updates the state of checkboxes based on whether options are enabled
+     */
     public void update() {
         runInBackgroundCheckBoxMenuItem.setState(controller.getRunInBackground());
         delayStartupCheckBoxMenuItem.setState(controller.getDelayStartup() > 0);
@@ -126,6 +92,12 @@ public class ServerLauncherMenu implements ActionListener {
             delay();
         } else if (actionSource == downloadJarsCheckBoxMenuItem) {
             downloadJars();
+        } else if (actionSource == javaCommandMenuItem) {
+            configureJava(false);
+        } else if (actionSource == oldJavaCommandMenuItem) {
+            configureJava(true);
+        } else if (actionSource == deleteBuiltJarsMenuItem) {
+            deleteBuiltJars();
         } else if (actionSource == errorsMenuItem) {
             CommonFunctions.goToURL(serverLauncherGUI.getMessage("infoURL"));
         } else if (actionSource == setupMenuItem) {
@@ -138,6 +110,12 @@ public class ServerLauncherMenu implements ActionListener {
             serverLauncherGUI.showMessage("Delay startup", serverLauncherGUI.getMessage("delayStartupText"));
         } else if (actionSource == downloadJarsMenuItem) {
             serverLauncherGUI.showMessage("Download jars", serverLauncherGUI.getMessage("downloadJarsText"));
+        } else if (actionSource == javaCommandInfoMenuItem) {
+            serverLauncherGUI.showMessage("Java command", serverLauncherGUI.getMessage("javaCommandText"));
+        } else if (actionSource == oldJavaCommandInfoMenuItem) {
+            serverLauncherGUI.showMessage("Old Java command", serverLauncherGUI.getMessage("oldJavaCommandText"));
+        } else if (actionSource == deleteBuiltJarsInfoMenuItem) {
+            serverLauncherGUI.showMessage("Delete built jar files", serverLauncherGUI.getMessage("deleteBuiltJarFilesText"));
         } else if (actionSource == aboutMenuItem) {
             serverLauncherGUI.showMessage("About", serverLauncherGUI.getMessage("aboutText"));
         } else if (actionSource == storyMenuItem) {
@@ -145,6 +123,116 @@ public class ServerLauncherMenu implements ActionListener {
         }
     }
 
+    /**
+     * Generates the children of the options menu
+     *
+     * @param mnOptions <p>A reference to the options menu</p>
+     */
+    private void generateOptionsMenuItems(JMenu mnOptions) {
+        runInBackgroundCheckBoxMenuItem = createCheckBoxMenuItem("Run in background on exit", mnOptions);
+        delayStartupCheckBoxMenuItem = createCheckBoxMenuItem("Delay Startup", mnOptions);
+        downloadJarsCheckBoxMenuItem = createCheckBoxMenuItem("Download jars", mnOptions);
+        javaCommandMenuItem = createMenuItem("Java command", mnOptions);
+        oldJavaCommandMenuItem = createMenuItem("Old Java command", mnOptions);
+        deleteBuiltJarsMenuItem = createMenuItem("Delete built jar files", mnOptions);
+    }
+
+    /**
+     * Generates the children of the info menu
+     *
+     * @param mnInfo <p>A reference to the info menu</p>
+     */
+    private void generateInfoMenuItems(JMenu mnInfo) {
+        JMenu mnOptionsInfo = new JMenu("Options");
+        mnInfo.add(mnOptionsInfo);
+
+        runInBackgroundMenuItem = createMenuItem("Run in background on exit", mnOptionsInfo);
+        delayStartupMenuItem = createMenuItem("Delay Startup", mnOptionsInfo);
+        downloadJarsMenuItem = createMenuItem("Download jars", mnOptionsInfo);
+        javaCommandInfoMenuItem = createMenuItem("Java command", mnOptionsInfo);
+        oldJavaCommandInfoMenuItem = createMenuItem("Old Java command", mnOptionsInfo);
+        deleteBuiltJarsInfoMenuItem = createMenuItem("Delete built jar files", mnOptionsInfo);
+
+        JMenu mnAbout = new JMenu("About");
+        mnInfo.add(mnAbout);
+
+        aboutMenuItem = createMenuItem("About", mnAbout);
+        storyMenuItem = createMenuItem("Story", mnAbout);
+    }
+
+    /**
+     * Creates a checkbox menu item
+     *
+     * @param itemName <p>The name of the new checkbox item</p>
+     * @param parent <p>The parent menu the item belongs to</p>
+     * @return <p>The created checkbox menu item</p>
+     */
+    private JCheckBoxMenuItem createCheckBoxMenuItem(String itemName, JMenu parent) {
+        JCheckBoxMenuItem menuItem = new JCheckBoxMenuItem(itemName);
+        parent.add(menuItem);
+        menuItem.addActionListener(this);
+        return menuItem;
+    }
+
+    /**
+     * Creates a menu item
+     *
+     * @param itemName <p>The name of the new item</p>
+     * @param parent <p>The parent menu the item belongs to</p>
+     * @return <p>The created menu item</p>
+     */
+    private JMenuItem createMenuItem(String itemName, JMenu parent) {
+        JMenuItem menuItem = new JMenuItem(itemName);
+        parent.add(menuItem);
+        menuItem.addActionListener(this);
+        return menuItem;
+    }
+
+    /**
+     * Asks the user for the new Java path
+     * @param old <p>Whether asking for the path to the old java version</p>
+     */
+    private void configureJava(boolean old) {
+        if (old) {
+            String response = JOptionPane.showInputDialog("Command or path to Java: ", controller.getOldJavaCommand());
+            if (response != null) {
+                controller.setOldJavaCommand(response);
+            }
+        } else {
+            String response = JOptionPane.showInputDialog("Command or path to Java: ", controller.getJavaCommand());
+            if (response != null) {
+                controller.setJavaCommand(response);
+            }
+        }
+    }
+
+    /**
+     * Deletes build Spigot and Bukkit .jar files if the user accepts
+     */
+    private void deleteBuiltJars() {
+        int answer = JOptionPane.showConfirmDialog(null, "This will delete built .jar files, causing them " +
+                        "to be rebuilt on the next run. Do you want to continue?", "Delete built .jar files",
+                JOptionPane.YES_NO_OPTION
+        );
+        if (answer == JOptionPane.YES_NO_OPTION) {
+            String jarDirectory = controller.getJarDirectory();
+            File spigotFile = new File(jarDirectory + "SpigotLatest.jar");
+            File bukkitFile = new File(jarDirectory + "BukkitLatest.jar");
+            boolean success = true;
+            if (spigotFile.exists() && !spigotFile.delete()) {
+                serverLauncherGUI.showError("Unable to delete latest spigot .jar");
+                success = false;
+            }
+            if (bukkitFile.exists() && !bukkitFile.delete()) {
+                serverLauncherGUI.showError("Unable to delete latest bukkit .jar");
+                success = false;
+            }
+            if (success) {
+                serverLauncherGUI.showMessage("Deletion successful", "Deleted built .jar files");
+            }
+        }
+    }
+
     /**
      * Asks the user for a delay if checked, and sets the value to the current profile
      */

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

@@ -1,7 +1,7 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
 import net.knarcraft.minecraftserverlauncher.Main;
-import net.knarcraft.minecraftserverlauncher.server.Server;
+import net.knarcraft.minecraftserverlauncher.server.ServerHandler;
 import net.knarcraft.minecraftserverlauncher.server.ServerTypeHandler;
 import net.knarcraft.minecraftserverlauncher.server.servertypes.ServerType;
 
@@ -76,7 +76,7 @@ public class ServerTab implements ActionListener {
         sl_panel_3.putConstraint(SpringLayout.WEST, lblMaxRam, 6, SpringLayout.EAST, serverTypes);
         panel.add(lblMaxRam);
 
-        maxRam = new JComboBox<>(Server.getRamList());
+        maxRam = new JComboBox<>(ServerHandler.getRamList());
         sl_panel_3.putConstraint(SpringLayout.NORTH, maxRam, 0, SpringLayout.NORTH, serverTypes);
         sl_panel_3.putConstraint(SpringLayout.WEST, maxRam, 6, SpringLayout.EAST, lblMaxRam);
         sl_panel_3.putConstraint(SpringLayout.EAST, maxRam, -10, SpringLayout.EAST, panel);

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

@@ -1,13 +1,17 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
 import net.knarcraft.minecraftserverlauncher.Main;
-import net.knarcraft.minecraftserverlauncher.profile.Controller;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
 import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 
 import javax.imageio.ImageIO;
 import javax.swing.*;
 import java.awt.*;
-import java.awt.event.*;
+import java.awt.event.ActionListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
 import java.io.IOException;
 import java.io.InputStream;
 
@@ -20,14 +24,14 @@ public class Tray {
 
     private SystemTray tray;
     private TrayIcon trayIcon;
-    private Controller controller;
+    private final ServerLauncherController controller;
-    private ServerLauncherGUI serverLauncherGUI;
+    private final ServerLauncherGUI serverLauncherGUI;
-    private JFrame mainFrame;
+    private final JFrame mainFrame;
 
     /**
      * Instantiates a new tray
      *
-     * @param mainFrame <p>The main frame of the GUI</p>
+     * @param mainFrame         <p>The main frame of the GUI</p>
      * @param serverLauncherGUI <p>The server launcher GUI to use</p>
      */
     public Tray(JFrame mainFrame, ServerLauncherGUI serverLauncherGUI) {

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

@@ -12,7 +12,8 @@ public class WebBrowser {
     private static JFrame browserFrame;
     private static JTextPane editorPane;
 
-    private WebBrowser() {}
+    private WebBrowser() {
+    }
 
     /**
      * Instantiates a new web browser
@@ -44,7 +45,8 @@ public class WebBrowser {
             editorPane.setContentType("text/html");
             editorPane.addHyperlinkListener(hyperlinkEvent -> {
                 if (hyperlinkEvent.getEventType().equals(HyperlinkEvent.EventType.ACTIVATED)) {
-                displayPage(hyperlinkEvent.getURL().toString()); }
+                    displayPage(hyperlinkEvent.getURL().toString());
+                }
             });
         } catch (IOException e) {
             editorPane.setContentType("text/html");

src/main/java/net/knarcraft/minecraftserverlauncher/utility/BackupUtil.java

@@ -0,0 +1,264 @@
+package net.knarcraft.minecraftserverlauncher.utility;
+
+import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.profile.Collection;
+import net.knarcraft.minecraftserverlauncher.server.Server;
+import net.knarcraft.minecraftserverlauncher.userinterface.BackupGUI;
+import net.knarcraft.minecraftserverlauncher.userinterface.GUI;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Stream;
+
+/**
+ * A helper class for performing server backup
+ */
+public class BackupUtil {
+
+    private static boolean backupAborted;
+    private static boolean backupRunning = false;
+
+    /**
+     * Aborts the currently running backup
+     */
+    public static void abortBackup() {
+        backupAborted = true;
+    }
+
+    /**
+     * Recursively copies a folder to another location
+     *
+     * @param source         <p>The folder to copy</p>
+     * @param destination    <p>Target destination</p>
+     * @param backupFileSize <p>The total file size of the backup in progress</p>
+     * @param alreadyCopied  <p>The amount of bytes already copied</p>
+     * @throws IOException <p>If we can't start a file stream</p>
+     */
+    private static long backupFolder(File source, File destination, long backupFileSize,
+                                                  long alreadyCopied) throws IOException {
+        if (backupAborted) {
+            return 0L;
+        }
+        if (!source.isDirectory()) {
+            long copiedFileSize = copyFile(source, destination);
+            BackupGUI.updateProgress("Copying " + source + "\n to " + destination,
+                    (int) ((alreadyCopied + copiedFileSize) * 100 / backupFileSize));
+            return copiedFileSize;
+        } else {
+            if (!destination.exists() && !destination.mkdir()) {
+                return 0L;
+            }
+            String[] files = source.list();
+            long copiedFilesSize = 0;
+            if (files != null) {
+                for (String file : files) {
+                    File srcFile = new File(source, file);
+                    File destinationFile = new File(destination, file);
+                    copiedFilesSize += backupFolder(srcFile, destinationFile, backupFileSize,
+                            alreadyCopied + copiedFilesSize);
+                    BackupGUI.updateProgress("Copying " + source + "\n to " + destination,
+                            (int) ((alreadyCopied + copiedFilesSize) * 100 / backupFileSize));
+                }
+            }
+            return copiedFilesSize;
+        }
+    }
+
+    /**
+     * Copies a file from one location to another
+     *
+     * @param source      <p>The file to copy</p>
+     * @param destination <p>The location of the copied file</p>
+     * @throws IOException <p>If reading or writing fails</p>
+     */
+    private static long copyFile(File source, File destination) throws IOException {
+        InputStream in = new FileInputStream(source);
+        OutputStream out = new FileOutputStream(destination);
+        byte[] buffer = new byte[1024];
+        int length;
+        while ((length = in.read(buffer)) > 0) {
+            out.write(buffer, 0, length);
+        }
+        in.close();
+        out.close();
+        return Files.size(source.toPath());
+    }
+
+    /**
+     * Copies all server directories to a folder specified by the user
+     *
+     * @param gui <p>The GUI to use for informing the user</p>
+     */
+    public static void backup(GUI gui) {
+        backupAborted = false;
+        if (backupRunning) {
+            gui.setStatus("A backup is already running");
+            return;
+        } else {
+            backupRunning = true;
+        }
+
+        //Get the folder to save the backed up files in
+        File path = gui.askForDirectory("Backup folder");
+        if (path == null || !path.isDirectory()) {
+            backupRunning = false;
+            return;
+        }
+
+        gui.setStatus("Backup running...");
+        List<List<File>> serverFolders = getFoldersOfEnabledServers(path);
+
+        gui.setStatus("Calculating backup size...");
+        long backupFileSize = getFolderSize(gui, serverFolders);
+
+        long locationFreeSpace = path.getFreeSpace();
+        if (locationFreeSpace < (backupFileSize + 2048000000)) {
+            gui.setStatus("Not enough available space. " + (backupFileSize / 1000000) + "MB necessary, but only " +
+                    (locationFreeSpace / 1000000) + "MB available");
+            backupRunning = false;
+            backupAborted = true;
+            return;
+        }
+
+        gui.setStatus("Backing up " + (backupFileSize / 1000000) + "MB");
+
+        performBackup(gui, serverFolders, backupFileSize);
+    }
+
+    /**
+     * Performs the actual backup after checks have passed and necessary info is available
+     * @param gui <p>The GUI to use for informing the user</p>
+     * @param serverFolders <p>The folders of the servers to backup</p>
+     * @param backupFileSize <p>The total size of the folders to backup</p>
+     */
+    private static void performBackup(GUI gui, List<List<File>> serverFolders, long backupFileSize) {
+        new BackupGUI();
+        BackupGUI.updateProgress("Backup starting...", 0);
+        long alreadyCopied = 0;
+        for (List<File> serverFolder : serverFolders) {
+            if (backupAborted || !backupRunning) {
+                gui.setStatus("Backup aborted");
+                backupRunning = false;
+                return;
+            }
+            alreadyCopied = backupServerFiles(gui, serverFolder, backupFileSize, alreadyCopied);
+        }
+        backupRunning = false;
+        if (backupAborted) {
+            gui.setStatus("Backup aborted");
+        } else {
+            BackupGUI.destroy();
+            gui.setStatus("Backup finished");
+        }
+    }
+
+    /**
+     * Backs up the files for a single server
+     *
+     * @param gui <p>The GUI to use for informing the user</p>
+     * @param serverFolder <p>The server's input and output folders</p>
+     * @param backupFileSize <p>The total size of the files to backup</p>
+     * @param alreadyCopied <p>The amount of bytes already copied</p>
+     * @return <p>The new amount of bytes copied</p>
+     */
+    private static long backupServerFiles(GUI gui, List<File> serverFolder, long backupFileSize, long alreadyCopied) {
+        File srcFolder = serverFolder.get(0);
+        File destinationFolder = serverFolder.get(1);
+
+        //Create child folders
+        if (!destinationFolder.exists() && !destinationFolder.mkdirs()) {
+            backupRunning = false;
+            gui.logError("Unable to create necessary sub-folder in the backup folder");
+            throw new IllegalArgumentException("Unable to create necessary sub-folder in the backup folder");
+        }
+        //Backup
+        try {
+            alreadyCopied += backupFolder(srcFolder, destinationFolder, backupFileSize, alreadyCopied);
+        } catch (IOException e) {
+            gui.showError("Backup caused an error: " + e.getMessage());
+            gui.logError(Arrays.toString(e.getStackTrace()));
+            BackupGUI.destroy();
+            backupRunning = false;
+        }
+        return alreadyCopied;
+    }
+
+    /**
+     * Gets the size of a list of folders
+     *
+     * @param gui           <p>The GUI to write any errors to</p>
+     * @param serverFolders <p>The folder to find the size of</p>
+     * @return <p>The size of the given folders</p>
+     */
+    private static long getFolderSize(GUI gui, List<List<File>> serverFolders) {
+        long folderSize = 0;
+        for (List<File> serverFolder : serverFolders) {
+            File srcFolder = serverFolder.get(0);
+            try (Stream<Path> walk = Files.walk(srcFolder.toPath())) {
+                folderSize += walk.filter(Files::isRegularFile).mapToLong(BackupUtil::getFileSize).sum();
+            } catch (IOException e) {
+                gui.setStatus(String.format("IO errors %s", e));
+            }
+        }
+        return folderSize;
+    }
+
+    /**
+     * Gets the input and output folders for enabled servers
+     *
+     * <p>The input folders are the folders to copy, while the output folders are the folders to write the backup to.
+     * Each list element contains a list of exactly two File items. The first one is the input folder, and the second
+     * one is the output folder</p>
+     *
+     * @param path <p>The path of the backup folder, as given by the user</p>
+     * @return <p>The folders to copy from/to</p>
+     */
+    private static List<List<File>> getFoldersOfEnabledServers(File path) {
+        List<List<File>> serverFolders = new ArrayList<>();
+
+        //Get folders of servers to back up
+        List<Collection> collections = Main.getController().getCurrentProfile().getCollections();
+        for (Collection collection : collections) {
+            //Ignore disabled and invalid servers
+            if (collection.getServer().getPath().equals("") || !collection.getServer().isEnabled()) {
+                continue;
+            }
+            //Decide sub-folders
+            Server targetServer = collection.getServer();
+            String name = targetServer.getName();
+            File srcFolder = new File(targetServer.getPath());
+            File destinationFolder = new File(path, name);
+
+            List<File> serverFolder = new ArrayList<>();
+            serverFolder.add(srcFolder);
+            serverFolder.add(destinationFolder);
+            serverFolders.add(serverFolder);
+        }
+        return serverFolders;
+    }
+
+    /**
+     * Gets the size of a file given its path
+     *
+     * @param path <p>The path to a file</p>
+     * @return <p>The size of the file in bytes, or 0 if an exception is thrown</p>
+     */
+    private static long getFileSize(Path path) {
+        try {
+            return Files.size(path);
+        } catch (IOException exception) {
+            System.out.printf("Failed to get size of %s%n%s", path, exception);
+            return 0L;
+        }
+    }
+
+}

src/main/java/net/knarcraft/minecraftserverlauncher/utility/CommonFunctions.java

@@ -1,12 +1,19 @@
 package net.knarcraft.minecraftserverlauncher.utility;
 
 import net.knarcraft.minecraftserverlauncher.Main;
-import net.knarcraft.minecraftserverlauncher.profile.Collection;
-import net.knarcraft.minecraftserverlauncher.server.Server;
-import net.knarcraft.minecraftserverlauncher.userinterface.GUI;
 import net.knarcraft.minecraftserverlauncher.userinterface.WebBrowser;
 
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -16,7 +23,7 @@ import java.nio.file.StandardCopyOption;
 import java.util.Scanner;
 
 /**
- * A holding class for methods shared between classes.
+ * A holding class for methods shared between classes
  *
  * @author Kristian Knarvik <kristian.knarvik@knett.no>
  * @version 1.0.0
@@ -34,7 +41,6 @@ public final class CommonFunctions {
     public static void createAllFolders() throws FileNotFoundException {
         createFolder(new File(filesDirectory));
         createFolder(new File(filesDirectory + File.separator + "Jars"));
-        createFolder(new File(filesDirectory + File.separator + "testjars"));
     }
 
     /**
@@ -43,7 +49,7 @@ public final class CommonFunctions {
      * @param folder <p>The folder to create</p>
      * @throws FileNotFoundException <p>If unable to create the folder</p>
      */
-    private static void createFolder(File folder) throws FileNotFoundException {
+    public static void createFolder(File folder) throws FileNotFoundException {
         if (!folder.exists()) {
             if (!folder.mkdirs()) {
                 throw new FileNotFoundException("Cannot create necessary directory.");
@@ -100,12 +106,88 @@ public final class CommonFunctions {
      *
      * @param path <p>The full url of the file to readFromServer</p>
      * @return <p>True if successful. False otherwise</p>
+     * @throws IOException <p>If unable to find or read the file</p>
      */
-    public static String readFile(String path) throws IOException {
+    public static String readRemoteFile(String path) throws IOException {
         URL url = new URL(path);
         return new Scanner(url.openStream()).useDelimiter("\\Z").next();
     }
 
+    /**
+     * Gets a buffered reader for reading a given file
+     *
+     * @param path <p>The path of the file to read</p>
+     * @return <p>A buffered reader for reading the file</p>
+     * @throws FileNotFoundException <p>If the file does not exist</p>
+     */
+    public static BufferedReader getFileReader(String path) throws FileNotFoundException {
+        return new BufferedReader(new InputStreamReader(new FileInputStream(path)));
+    }
+
+    /**
+     * Gets a buffered writer for writing to a given file
+     * @param path <p>The path to the file to write to</p>
+     * @return <p>A buffered writer for writing to the file</p>
+     * @throws FileNotFoundException <p>If the file does not exist</p>
+     */
+    public static BufferedWriter getFileWriter(String path) throws FileNotFoundException {
+        return new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path)));
+    }
+
+    /**
+     * Reads a file from disk
+     *
+     * @param path <p>The path of the file to read</p>
+     * @return <p>The contents of the file</p>
+     * @throws IOException <p>If unable to find or read the file</p>
+     */
+    public static String readFile(String path) throws IOException {
+        return CommonFunctions.readBufferedReader(getFileReader(path));
+    }
+
+
+    /**
+     * Writes text to a file and adds a trailing newline
+     *
+     * @param path               <p>The path of the file to write to</p>
+     * @param text               <p>The text to write</p>
+     * @throws IOException <p>If unable to write to the file</p>
+     */
+    public static void writeFile(String path, String text) throws IOException {
+        writeFile(path, text, !text.equals(""));
+    }
+
+    /**
+     * Writes text to a file
+     *
+     * @param path               <p>The path of the file to write to</p>
+     * @param text               <p>The text to write</p>
+     * @param addTrailingNewline <p>Whether to add a new line at the end of the file</p>
+     * @throws IOException <p>If unable to write to the file</p>
+     */
+    public static void writeFile(String path, String text, Boolean addTrailingNewline) throws IOException {
+        BufferedWriter writer = getFileWriter(path);
+        writer.write(text);
+        if (addTrailingNewline) {
+            writer.newLine();
+        }
+        writer.close();
+    }
+
+    /**
+     * Appends text to a file
+     *
+     * @param path <p>The path to the file to append to</p>
+     * @param text <p>The text to append</p>
+     * @throws IOException <p>If unable to append to the file</p>
+     */
+    public static void appendFile(String path, String text) throws IOException {
+        BufferedWriter writer = new BufferedWriter(new FileWriter(path, true));
+        writer.write(text);
+        writer.newLine();
+        writer.close();
+    }
+
     /**
      * Downloads a file from a website and replaces the target file
      *
@@ -124,55 +206,6 @@ public final class CommonFunctions {
         }
     }
 
-    /**
-     * Recursively copies a folder to another location
-     *
-     * @param source      <p>The folder to copy</p>
-     * @param destination <p>Target destination</p>
-     * @throws IOException <p>If we can't start a file stream</p>
-     */
-    private static void copyFolder(GUI serverLauncherGui, File source, File destination) throws IOException {
-        if (!source.isDirectory()) {
-            copyFile(serverLauncherGui, source, destination);
-        } else {
-            serverLauncherGui.setStatus("Copying directory " + source);
-            if (!destination.exists() && !destination.mkdir()) {
-                return;
-            }
-            String[] files = source.list();
-            if (files != null) {
-                for (String file : files) {
-                    File srcFile = new File(source, file);
-                    File destinationFile = new File(destination, file);
-                    copyFolder(serverLauncherGui, srcFile, destinationFile);
-                }
-            }
-            serverLauncherGui.setStatus("Copied directory " + source);
-        }
-    }
-
-    /**
-     * Copies a file from one location to another
-     *
-     * @param serverLauncherGui <p>The serverLauncherGui to use for alerting the user</p>
-     * @param source            <p>The file to copy</p>
-     * @param destination       <p>The location of the copied file</p>
-     * @throws IOException <p>If reading or writing fails</p>
-     */
-    private static void copyFile(GUI serverLauncherGui, File source, File destination) throws IOException {
-        serverLauncherGui.setStatus("Copying file " + source + "...");
-        InputStream in = new FileInputStream(source);
-        OutputStream out = new FileOutputStream(destination);
-        byte[] buffer = new byte[1024];
-        int length;
-        while ((length = in.read(buffer)) > 0) {
-            out.write(buffer, 0, length);
-        }
-        in.close();
-        out.close();
-        serverLauncherGui.setStatus("Copied file " + source);
-    }
-
     /**
      * Opens an url in the user's default application.
      *
@@ -199,41 +232,17 @@ public final class CommonFunctions {
         StringBuilder text = new StringBuilder();
         char[] readCharacters = new char[1000];
         while (reader.ready()) {
-            reader.read(readCharacters);
+            if (reader.read(readCharacters) > 0) {
-            text.append(readCharacters);
+                text.append(readCharacters);
-            readCharacters = new char[1000];
+                readCharacters = new char[1000];
+            } else {
+                return text.toString().trim();
+            }
         }
         return text.toString().trim();
     }
 
-    /**
+
-     * Copies all server directories to a folder specified by the user.
-     */
-    public static void backup(GUI gui) {
-        File path = gui.askForDirectory("Backup folder");
-        for (Collection collection : Main.getController().getCurrentProfile().getCollections()) {
-            //Ignore disabled and invalid servers
-            if (collection.getServer().getPath().equals("") || !collection.getServer().isEnabled()) {
-                continue;
-            }
-            //Decide sub-folders
-            Server targetServer = collection.getServer();
-            String name = targetServer.getName();
-            File srcFolder = new File(targetServer.getPath());
-            File destinationFolder = new File(path, name);
-            //Create child folders
-            if (!destinationFolder.exists() && !destinationFolder.mkdirs()) {
-                throw new IllegalArgumentException("Unable to create necessary sub-folder in the backup folder");
-            }
-            //Backup
-            try {
-                CommonFunctions.copyFolder(gui, srcFolder, destinationFolder);
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-        gui.setStatus("Backup finished");
-    }
 
     /**
      * Validates that a name is not empty and does not contain invalid characters
@@ -242,6 +251,34 @@ public final class CommonFunctions {
      * @return <p>True if the name is valid</p>
      */
     public static boolean nameIsValid(String name) {
-        return !name.equals("") && name.matches("[^!?;,]+");
+        return name != null && !name.equals("") && name.matches("[^!?;,]+");
     }
+
+    /**
+     * Removes all files within a folder
+     *
+     * @param target <p>The folder to delete from</p>
+     */
+    static void removeFilesRecursively(File target) {
+        File[] oldFiles = target.listFiles();
+        if (oldFiles == null) {
+            throw new IllegalArgumentException("Unable to list files in directory");
+        }
+        for (File file : oldFiles) {
+            if (file.isFile()) {
+                if (!file.delete()) {
+                    throw new IllegalArgumentException("Unable to delete a file from the directory");
+                }
+            }
+        }
+        for (File file : oldFiles) {
+            if (file.isDirectory()) {
+                removeFilesRecursively(file);
+                if (!file.delete()) {
+                    throw new IllegalArgumentException("Unable to delete a file from the directory");
+                }
+            }
+        }
+    }
+
 }

src/main/java/net/knarcraft/minecraftserverlauncher/utility/JarBuilder.java

@@ -0,0 +1,179 @@
+package net.knarcraft.minecraftserverlauncher.utility;
+
+import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
+import net.knarcraft.minecraftserverlauncher.server.ServerVersionContainer;
+import net.knarcraft.minecraftserverlauncher.userinterface.GUI;
+import net.knarcraft.minecraftserverlauncher.userinterface.ServerLauncherGUI;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.nio.file.Paths;
+
+/**
+ * The jar builder is responsible for building the newest Spigot and CraftBukkit .jar files using BuildTools
+ */
+public class JarBuilder {
+
+    private final String buildDirectory;
+    private final String jarDirectory;
+    private final ServerVersionContainer versionContainer;
+    private final GUI gui;
+    private final String javaCommand;
+
+    /**
+     * Instantiates a new jar builder
+     *
+     * @param buildDirectory <p>The directory containing BuildTool files</p>
+     * @param jarDirectory   <p>The directory containing downloaded .jar files</p>
+     * @param gui            <p>The GUI to write messages to</p>
+     */
+    public JarBuilder(String buildDirectory, String jarDirectory, GUI gui) {
+        this.buildDirectory = buildDirectory;
+        this.jarDirectory = jarDirectory;
+        this.gui = gui;
+        this.versionContainer = ServerVersionContainer.getInstance();
+        this.javaCommand = ServerLauncherController.getInstance().getJavaCommand();
+        try {
+            CommonFunctions.createFolder(new File(buildDirectory));
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Builds the latest version of the spigot .jar file
+     */
+    public boolean buildSpigotJar() {
+        gui.setStatus("Building Spigot jar ...");
+        downloadBuildTools();
+        ProcessBuilder processBuilder = new ProcessBuilder(javaCommand, "-jar", "BuildTools.jar", "--rev",
+                "latest", "--output-dir", jarDirectory);
+        if (executeBuildProcess(processBuilder) && moveBuiltJar("spigot-", "SpigotLatest.jar")) {
+            gui.setStatus("Finished moving spigot.jar");
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Builds the latest version of the craftbukkit .jar file
+     */
+    public boolean buildBukkitJar() {
+        gui.setStatus("Building Bukkit jar ...");
+        downloadBuildTools();
+        ProcessBuilder processBuilder = new ProcessBuilder(javaCommand, "-jar", "BuildTools.jar", "--compile",
+                "craftbukkit", "--rev", "latest", "--output-dir", jarDirectory);
+        if (executeBuildProcess(processBuilder) && moveBuiltJar("craftbukkit-", "BukkitLatest.jar")) {
+            gui.setStatus("Finished moving craftbukkit.jar");
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Downloads the latest BuildTools version
+     */
+    public void downloadBuildTools() {
+        ServerLauncherGUI gui = Main.getController().getGUI();
+        try {
+            String latestVersion = getLatestBuildToolsVersion();
+            boolean exists = new File(buildDirectory + "BuildTools.jar").exists();
+            boolean isUpdated = latestVersion.equals(versionContainer.getDownloadedBuildToolsVersion());
+
+            if (!exists || !isUpdated) {
+                String buildToolsURL = "https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar";
+                boolean success = CommonFunctions.downloadFile(buildToolsURL, Paths.get(buildDirectory + "BuildTools.jar"));
+                if (!success) {
+                    gui.setStatus("Unable to download the latest BuildTools");
+                    gui.logError("Target: " + buildDirectory + "BuildTools.jar");
+                    gui.logError("URL: " + buildToolsURL);
+                } else {
+                    versionContainer.setDownloadedBuildToolsVersion(latestVersion);
+                }
+            }
+        } catch (IOException e) {
+            gui.setStatus("Unable to download the latest BuildTools");
+            gui.logMessage(e.getMessage());
+        }
+    }
+
+    /**
+     * Moves a built .jar file to its target file
+     *
+     * @param searchString <p>The start of the name of the built file used to find it</p>
+     * @param newName      <p>The new name of the built file</p>
+     * @return <p>True if the .jar file was moved successfully</p>
+     */
+    private boolean moveBuiltJar(String searchString, String newName) {
+        File[] foundFiles = new File(jarDirectory).listFiles((file) -> file.isFile() && file.getName().startsWith(searchString));
+        if (foundFiles != null && foundFiles.length == 1) {
+            File newFileLocation = new File(jarDirectory + File.separator + newName);
+            if (newFileLocation.exists()) {
+                if (!newFileLocation.delete()) {
+                    gui.showError("Unable to delete previously built .jar");
+                }
+            }
+            if (!foundFiles[0].renameTo(newFileLocation)) {
+                gui.showError("Unable to move built .jar");
+            } else {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Starts the build process and initializes
+     *
+     * @param processBuilder <p>The process builder to execute</p>
+     * @return <p>True if the process exited successfully</p>
+     */
+    private boolean executeBuildProcess(ProcessBuilder processBuilder) {
+        processBuilder.directory(new File(buildDirectory));
+        processBuilder.redirectErrorStream(true);
+        try {
+            Process process = processBuilder.start();
+            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));
+            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
+
+            do {
+                writer.write(CommonFunctions.readBufferedReader(reader));
+            } while (process.isAlive());
+
+            writer.newLine();
+            writer.flush();
+
+            if (process.exitValue() == 0) {
+                gui.setStatus("Jar building process finished successfully.");
+                return true;
+            } else {
+                gui.showError("Jar building process failed with exit code " + process.exitValue() +
+                        ". Please check the BuildTools log for errors.");
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return false;
+    }
+
+    /**
+     * Gets the latest build tools version available
+     *
+     * @return <p>The latest build tools version available</p>
+     * @throws IOException <p>If unable to read the version file</p>
+     */
+    String getLatestBuildToolsVersion() throws IOException {
+        String versionDocument;
+        versionDocument = CommonFunctions.readRemoteFile("https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/");
+        return CommonFunctions.stringBetween(versionDocument, "BuildTools #", " [");
+    }
+
+}

src/main/java/net/knarcraft/minecraftserverlauncher/utility/JarDownloader.java

@@ -60,6 +60,9 @@ public final class JarDownloader {
                 continue;
             }
             for (String version : type.getVersions()) {
+                if ((type.getName().equals("Spigot") || type.getName().equals("Bukkit")) && version.equals("Latest")) {
+                    continue;
+                }
                 gui.setStatus("Downloading " + type.getName() + version + "...");
                 boolean success = type.downloadJar(jarDirectory, version);
                 if (!success) {

src/main/java/net/knarcraft/minecraftserverlauncher/utility/Updater.java

@@ -5,16 +5,18 @@ import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
 import net.knarcraft.minecraftserverlauncher.Main;
-import net.knarcraft.minecraftserverlauncher.userinterface.GUI;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
 
 import javax.swing.*;
-import java.io.*;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
 import java.nio.file.Paths;
 import java.util.Scanner;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.getResourceAsScanner;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readRemoteFile;
 
 /**
  * A utility used for updating the software
@@ -27,13 +29,12 @@ public final class Updater {
     private static final String targetFile = "minecraft-server-launcher.jar";
 
     /**
-     * Checks if a newer version is available
+     * Gets the version channel and version of this software instance
      *
-     * @param updateURL     <p>The URL used for checking for updates</p>
+     * @return <p>An array of Channel, Version</p>
-     * @param updateChannel <p>The release channel to use</p>
+     * @throws FileNotFoundException <p>If unable to find or read currentversion.csv</p>
-     * @throws IOException <p>If the update data cannot be read</p>
      */
-    public static void checkForUpdate(String updateURL, String updateChannel) throws IOException {
+    public static String[] getCurrentVersion() throws FileNotFoundException {
         Scanner file = getResourceAsScanner("currentversion.csv");
         if (!file.hasNextLine()) {
             throw new FileNotFoundException("File currentversion.csv is invalid");
@@ -44,12 +45,26 @@ public final class Updater {
         }
         String oldVer = file.nextLine();
         file.close();
+        return new String[]{oldType, oldVer};
+    }
 
-        String data = readFile(updateURL);
+    /**
+     * Checks if a newer version is available
+     *
+     * @param updateURL     <p>The URL used for checking for updates</p>
+     * @param updateChannel <p>The release channel to use</p>
+     * @throws IOException <p>If the update data cannot be read</p>
+     */
+    public static void checkForUpdate(String updateURL, String updateChannel) throws IOException {
+        String[] oldData = getCurrentVersion();
+        String oldType = oldData[0];
+        String oldVer = oldData[1];
+
+        String data = readRemoteFile(updateURL);
         JsonObject jsonObject = new JsonParser().parse(data).getAsJsonObject();
         String latest = jsonObject.getAsJsonObject("latest").get(updateChannel).getAsString();
 
-        if (!oldType.equals(updateChannel) || !oldVer.equals(latest)) {
+        if (!oldType.equals(updateChannel) || isVersionHigher(oldVer, latest)) {
             JsonArray versionList = jsonObject.getAsJsonArray("versions");
             String url = "";
             for (JsonElement elem : versionList) {
@@ -75,6 +90,27 @@ public final class Updater {
         }
     }
 
+    /**
+     * Decides whether one version number is higher than another
+     *
+     * @param oldVersion <p>The old version to check</p>
+     * @param newVersion <p>The new version to check</p>
+     * @return <p>True if the new version is higher than the old one</p>
+     */
+    public static boolean isVersionHigher(String oldVersion, String newVersion) {
+        String[] oldVersionParts = oldVersion.split("\\.");
+        String[] newVersionParts = newVersion.split("\\.");
+        int versionLength = Math.max(oldVersionParts.length, newVersionParts.length);
+        for (int i = 0; i < versionLength; i++) {
+            int oldVersionNumber = oldVersionParts.length > i ? Integer.parseInt(oldVersionParts[i]) : 0;
+            int newVersionNumber = newVersionParts.length > i ? Integer.parseInt(newVersionParts[i]) : 0;
+            if (newVersionNumber != oldVersionNumber) {
+                return newVersionNumber > oldVersionNumber;
+            }
+        }
+        return false;
+    }
+
     /**
      * Updates the software
      *
@@ -82,8 +118,9 @@ public final class Updater {
      * @throws IOException <p>If unable to run the updater</p>
      */
     private static void runUpdater(String url) throws IOException {
+        String javaCommand = ServerLauncherController.getInstance().getJavaCommand();
         ProcessBuilder builder;
-        builder = new ProcessBuilder("java", "-jar", "Updater.jar", url, "yes", targetFile, "5", "nogui");
+        builder = new ProcessBuilder(javaCommand, "-jar", "Updater.jar", url, "yes", targetFile, "5", "nogui");
         builder.directory(new File(Main.getApplicationWorkDirectory()));
         builder.redirectErrorStream(true);
         builder.start();

src/main/resources/currentversion.csv

@@ -1,2 +1,2 @@
 beta
-1.2.3
+1.4.0

src/main/resources/menumsg.csv

@@ -5,4 +5,7 @@ downloadJarsText=This option will download all the .jar files available in the p
 aboutText=This software was created to start and manage several servers simultaneously._BREAK_You no longer have to do the tedious work of manually downloading different .jar files every time you want to try something new.
 infoURL=https://archive.knarcraft.net/Scripts/BungeeMinecraftServerLauncherInfo/
 manualUpdateURL=https://git.knarcraft.net/KnarCraft/Minecraft-Server-Launcher/releases
-storyURL=https://archive.knarcraft.net/Scripts/BungeeMinecraftServerLauncherStory/
+storyURL=https://archive.knarcraft.net/Scripts/BungeeMinecraftServerLauncherStory/
+javaCommandText=This option allows you to set a custom command/path to the Java executable used for Minecraft 1.17 and above._BREAK_If "java" is currently pointing to Java 8, you can use this to set a custom one for running new Minecraft servers and BuildTools.
+oldJavaCommandText=This option allows you to set a custom command/path to the Java executable used for Minecraft 1.16 and below._BREAK_If "java" is currently pointing to Java 16, you can use this to set a custom one for running old Minecraft servers.
+deleteBuiltJarFilesText=This option allows you to easily delete built Spigot and Bukkit .jar files._BREAK_You should occasionally run this option to update the built .jar files to ensure you're running the latest update.

src/main/resources/servertypes.csv

@@ -1,11 +1,11 @@
-Vanilla;Latest,Snapshot,1.16.3,1.15.2,1.14.4,1.13.2,1.12.2,1.11.2,1.10.2,1.9.4,1.8.9,1.7.10,1.6.4,1.5.2,1.4.7,1.3.2,1.2.5;https://launchermeta.mojang.com/mc/game/version_manifest.json;"release":";";https://s3.amazonaws.com/Minecraft.Download/versions/
+Vanilla;Latest,Snapshot,1.17.1,1.16.5,1.15.2,1.14.4,1.13.2,1.12.2,1.11.2,1.10.2,1.9.4,1.8.9,1.7.10,1.6.4,1.5.2,1.4.7,1.3.2,1.2.5;https://launchermeta.mojang.com/mc/game/version_manifest.json;"release":";";https://s3.amazonaws.com/Minecraft.Download/versions/
-Spigot;1.16.3,1.15.2,1.14.4,1.13.2,1.12.2,1.11.2,1.10.2,1.9.4,1.9.4,1.8.8,1.7.10,1.6.4-R2.1,1.5.2-R1.1,1.4.7-R1.1;https://static.knarcraft.net/archive/downloads/minecraftserverjars/Spigot/;spigot-
+Spigot;Latest,1.17.1,1.16.5,1.15.2,1.14.4,1.13.2,1.12.2,1.11.2,1.10.2,1.9.4,1.9.4,1.8.8,1.7.10,1.6.4-R2.1,1.5.2-R1.1,1.4.7-R1.1;https://static.knarcraft.net/archive/downloads/minecraftserverjars/Spigot/;spigot-
-Paper;1.16.3,1.15.2,1.14.4,1.13.2,1.12.2,1.11.2,1.10.2,1.9.4,1.8.8;https://static.knarcraft.net/archive/downloads/minecraftserverjars/Paper/;Paper-
+Paper;1.17.1,1.16.5,1.15.2,1.14.4,1.13.2,1.12.2,1.11.2,1.10.2,1.9.4,1.8.8;https://papermc.io/api/v1/paper/;"latest":;,;https://papermc.io/api/v1/paper/
-SpongeVanilla;1.12.2,1.11.2,1.10.2,1.8.9;https://dl-api.spongepowered.org/v1/org.spongepowered/spongevanilla/downloads?type=stable&minecraft=;"version":";",;https://repo.spongepowered.org/maven/org/spongepowered/spongevanilla/;/spongevanilla-
+#SpongeVanilla;1.12.2,1.11.2,1.10.2,1.8.9;https://dl-api.spongepowered.org/v1/org.spongepowered/spongevanilla/downloads?type=stable&minecraft=;"version":";",;https://repo.spongepowered.org/maven/org/spongepowered/spongevanilla/;/spongevanilla-
-Craftbukkit;1.16.3,1.15.2,1.14.4,1.13.2,1.12.2,1.11.2,1.10.2,1.9.4,1.8.8,1.7.10-R0.1,1.6.4-R2.0,1.5.2-R1.0,1.4.6-R0.3,1.3.2-R3.0,1.2.5-R2.0,1.1-R6,1.0.1-R1,b1.8.1,b1.7.3;https://static.knarcraft.net/archive/downloads/minecraftserverjars/Bukkit/;craftbukkit-
+Craftbukkit;Latest,1.17.1,1.16.5,1.15.2,1.14.4,1.13.2,1.12.2,1.11.2,1.10.2,1.9.4,1.8.8,1.7.10-R0.1,1.6.4-R2.0,1.5.2-R1.0,1.4.6-R0.3,1.3.2-R3.0,1.2.5-R2.0,1.1-R6,1.0.1-R1,b1.8.1,b1.7.3;https://static.knarcraft.net/archive/downloads/minecraftserverjars/Bukkit/;craftbukkit-
-SpongeForge;1.12.2,1.11.2,1.10.2;https://dl-api.spongepowered.org/v1/org.spongepowered/spongeforge/downloads?type=stable&minecraft=;"version":";",;https://repo.spongepowered.org/maven/org/spongepowered/spongeforge/;/spongeforge-
+#SpongeForge;1.12.2,1.11.2,1.10.2;https://dl-api.spongepowered.org/v1/org.spongepowered/spongeforge/downloads?type=stable&minecraft=;"version":";",;https://repo.spongepowered.org/maven/org/spongepowered/spongeforge/;/spongeforge-
 MCPCplus;1.6.4,1.6.2,1.5.2,1.4.7;https://static.knarcraft.net/archive/downloads/minecraftserverjars/MCPC+/;mcpcplus
 Bungee;Latest,1.7.10,1.6.4,1.5.2,1.4.7;https://ci.md-5.net/job/BungeeCord/lastSuccessfulBuild/artifact/bootstrap/target/;Artifacts of BungeeCord #; ;http://ci.md-5.net/job/BungeeCord/lastSuccessfulBuild/artifact/bootstrap/target/BungeeCord.jar;https://static.knarcraft.net/archive/downloads/minecraftserverjars/BungeeCord/;BungeeCord-
-Waterfall;1.16,1.15,1.14,1.13,1.12,1.11;https://papermc.io/api/v1/waterfall/;"latest":";";https://papermc.io/api/v1/waterfall/
+Waterfall;1.17,1.16,1.15,1.14,1.13,1.12,1.11;https://papermc.io/api/v1/waterfall/;"latest":;,;https://papermc.io/api/v1/waterfall/
-Travertine;1.16,1.15,1.14,1.13,1.12;https://papermc.io/api/v1/travertine/;"latest":";";https://papermc.io/api/v1/travertine/
+Travertine;1.16,1.15,1.14,1.13,1.12;https://papermc.io/api/v1/travertine/;"latest":;,;https://papermc.io/api/v1/travertine/
 Custom;

src/test/java/net/knarcraft/minecraftserverlauncher/server/ServerTest.java

@@ -1,17 +1,17 @@
 package net.knarcraft.minecraftserverlauncher.server;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import javax.naming.ConfigurationException;
 
-import static junit.framework.TestCase.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
-import static junit.framework.TestCase.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 
 public class ServerTest {
 
     @Test
     public void fromStringTest() throws ConfigurationException {
-        Server server = Server.fromString("asd;/home/;false;Bukkit;1.10.2;4G;");
+        Server server = ServerHandler.fromString("asd;/home/;false;Bukkit;1.10.2;4G;");
         assertEquals("asd", server.getName());
         assertEquals("/home/", server.getPath());
         assertFalse(server.isEnabled());

src/test/java/net/knarcraft/minecraftserverlauncher/server/ServerTypeHandlerTest.java

@@ -1,13 +1,12 @@
 package net.knarcraft.minecraftserverlauncher.server;
 
 import net.knarcraft.minecraftserverlauncher.server.servertypes.ServerType;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import javax.naming.ConfigurationException;
-
 import java.util.Arrays;
 
-import static junit.framework.TestCase.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class ServerTypeHandlerTest {
 

src/test/java/net/knarcraft/minecraftserverlauncher/server/ServerVersionContainerTest.java

@@ -2,13 +2,16 @@ package net.knarcraft.minecraftserverlauncher.server;
 
 import net.knarcraft.minecraftserverlauncher.Main;
 import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
-import org.junit.Before;
+import org.junit.jupiter.api.BeforeEach;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
 
-import static junit.framework.TestCase.assertEquals;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.createAllFolders;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class ServerVersionContainerTest {
 
@@ -16,7 +19,7 @@ public class ServerVersionContainerTest {
     private final String versionFile = filesDirectory + File.separator + "versions.csv";
     private ServerVersionContainer serverVersionContainer;
 
-    @Before
+    @BeforeEach
     public void setUp() {
         try {
             createAllFolders();
@@ -35,14 +38,14 @@ public class ServerVersionContainerTest {
         serverVersionContainer.reset();
         System.out.println(serverVersionContainer.toString());
         assertEquals("vanillaVersion;null\nsnapshotVersion;null\nbungeeVersion;null\nwaterfallVersions;\n" +
-                        "travertineVersions;\nspongeVanillaVersions;\nspongeForgeVersions;",
+                        "travertineVersions;\npaperVersions;\nspongeVanillaVersions;\nspongeForgeVersions;\ndownloadedBuildToolsVersion;null",
                 serverVersionContainer.toString());
     }
 
     @Test
     public void saveStateTest() throws IOException {
         serverVersionContainer.saveState();
-        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(versionFile)));
+        BufferedReader reader = CommonFunctions.getFileReader(versionFile);
         String savedData = CommonFunctions.readBufferedReader(reader);
         reader.close();
         assertEquals(serverVersionContainer.toString(), savedData);

src/test/java/net/knarcraft/minecraftserverlauncher/userinterface/FakeGUI.java

@@ -1,19 +1,31 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
+import java.io.BufferedWriter;
 import java.io.File;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
 
 public class FakeGUI extends MessageHandler implements GUI {
 
+    private final BufferedWriter writer;
+
     /***
      * Initializes a new fake gui
      */
     public FakeGUI() {
         super(true);
+        this.writer = new BufferedWriter(new OutputStreamWriter(System.out));
     }
 
     @Override
     public void setStatus(String message) {
-        System.out.println(message);
+        try {
+            writer.write(message);
+            writer.newLine();
+            writer.flush();
+        } catch (IOException e) {
+            System.out.println(message);
+        }
     }
 
     @Override

src/test/java/net/knarcraft/minecraftserverlauncher/utility/CommonFunctionsTest.java

@@ -1,19 +1,12 @@
 package net.knarcraft.minecraftserverlauncher.utility;
 
-import net.knarcraft.minecraftserverlauncher.Main;
+import org.junit.jupiter.api.Test;
-import org.junit.Test;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.stringBetween;
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class CommonFunctionsTest {
 
-    @Test
-    public void saveProfileTest() {
-        Main.getController().addProfile("Test");
-        Main.getController().saveState();
-    }
-
     @Test
     public void stringBetweenTest() {
         String substring = stringBetween("fish'nchips", "f", "'");

src/test/java/net/knarcraft/minecraftserverlauncher/utility/JarBuilderTest.java

@@ -0,0 +1,105 @@
+package net.knarcraft.minecraftserverlauncher.utility;
+
+import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
+import net.knarcraft.minecraftserverlauncher.userinterface.FakeGUI;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.MethodOrderer;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+
+import javax.naming.ConfigurationException;
+import java.io.File;
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+public class JarBuilderTest {
+
+    private static JarBuilder jarBuilder;
+    private static String targetDirectory;
+    private static String jarDirectory;
+
+    @BeforeAll
+    public static void preSetUp() {
+        try {
+            ServerLauncherController.getInstance().loadState(true);
+        } catch (ConfigurationException | IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @BeforeEach
+    public void setUp() {
+        targetDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator +
+                "BuildTools" + File.separator;
+        jarDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator +
+                "testjars" + File.separator;
+        jarBuilder = new JarBuilder(targetDirectory, jarDirectory, new FakeGUI());
+        removeBuildToolsFiles();
+    }
+
+    @AfterAll
+    public static void tearDown() {
+        removeBuildToolsFiles();
+    }
+
+    @Test
+    @Order(3)
+    public void buildLatestSpigotJarTest() {
+        File spigotFile = new File(jarDirectory + "SpigotLatest.jar");
+        if (spigotFile.exists() && !spigotFile.delete()) {
+            throw new IllegalArgumentException("Unable to remove existing spigot .jar");
+        }
+        jarBuilder.buildSpigotJar();
+        assertTrue(spigotFile.exists());
+    }
+
+    @Test
+    @Order(4)
+    public void buildLatestBukkitJarTest() {
+        File bukkitFile = new File(jarDirectory + "BukkitLatest.jar");
+        if (bukkitFile.exists() && !bukkitFile.delete()) {
+            throw new IllegalArgumentException("Unable to remove existing bukkit .jar");
+        }
+        jarBuilder.buildBukkitJar();
+        assertTrue(new File(jarDirectory + "BukkitLatest.jar").exists());
+    }
+
+    @Test
+    @Order(2)
+    public void downloadLatestBuildToolsJarTest() {
+        jarBuilder.downloadBuildTools();
+        assertTrue(new File(targetDirectory + "BuildTools.jar").exists());
+    }
+
+    @Test
+    @Order(1)
+    public void getLatestBuildToolsVersionTest() {
+        try {
+            String latestVersion = jarBuilder.getLatestBuildToolsVersion();
+            assertNotEquals("", latestVersion);
+            int newVersion = Integer.parseInt(latestVersion);
+            assertNotEquals(newVersion, 0);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Removes build tools files
+     */
+    private static void removeBuildToolsFiles() {
+        File target = new File(targetDirectory);
+        if (!target.exists() && !target.mkdirs()) {
+            throw new IllegalArgumentException("Unable to create the test files directory");
+        }
+        CommonFunctions.removeFilesRecursively(target);
+    }
+
+}

src/test/java/net/knarcraft/minecraftserverlauncher/utility/JarDownloaderTest.java

@@ -4,28 +4,35 @@ import net.knarcraft.minecraftserverlauncher.Main;
 import net.knarcraft.minecraftserverlauncher.server.ServerTypeHandler;
 import net.knarcraft.minecraftserverlauncher.server.servertypes.ServerType;
 import net.knarcraft.minecraftserverlauncher.userinterface.FakeGUI;
-import org.junit.AfterClass;
+import org.junit.jupiter.api.AfterAll;
-import org.junit.BeforeClass;
+import org.junit.jupiter.api.BeforeAll;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import javax.naming.ConfigurationException;
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 
-import static junit.framework.TestCase.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
-import static junit.framework.TestCase.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 
 public class JarDownloaderTest {
     private static String targetDirectory;
 
-    @BeforeClass
+    @BeforeAll
     public static void setUp() {
-        targetDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator +
+        String filesDirectory = Main.getApplicationWorkDirectory() + File.separator + "files";
-                "testjars" + File.separator;
+        try {
+            CommonFunctions.createFolder(new File(filesDirectory + File.separator + "testjars"));
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        }
+        targetDirectory = filesDirectory + File.separator + "testjars" + File.separator;
         removeDownloadedFiles();
     }
 
-    @AfterClass
+    @AfterAll
     public static void cleanUp() {
         removeDownloadedFiles();
     }
@@ -36,7 +43,7 @@ public class JarDownloaderTest {
         downloader.downloadJars();
     }
 
-    @Test
+    /*@Test
     public void spongeVanillaDownloadTest() throws IOException, ConfigurationException {
         singleDownloadTest(ServerTypeHandler.getByName("SpongeVanilla"));
     }
@@ -44,7 +51,7 @@ public class JarDownloaderTest {
     @Test
     public void spongeForgeDownloadTest() throws IOException, ConfigurationException {
         singleDownloadTest(ServerTypeHandler.getByName("SpongeForge"));
-    }
+    }*/
 
     @Test
     public void spigotDownloadTest() throws ConfigurationException, IOException {
@@ -57,7 +64,7 @@ public class JarDownloaderTest {
     }
 
     @Test
-    public void craftbukkitDownloadTest() throws ConfigurationException, IOException {
+    public void craftBukkitDownloadTest() throws ConfigurationException, IOException {
         singleDownloadTest(ServerTypeHandler.getByName("Bukkit"));
     }
 
@@ -95,6 +102,10 @@ public class JarDownloaderTest {
     private void singleDownloadTest(ServerType serverType) throws IOException {
         assertNotNull(serverType);
         for (String serverVersion : serverType.getVersions()) {
+            if ((serverType.getName().equals("Spigot") || serverType.getName().equals("Bukkit"))
+                    && serverVersion.equals("Latest")) {
+                continue;
+            }
             System.out.println("Downloading " + serverType.getName() + serverVersion + ".jar");
             serverType.downloadJar(targetDirectory, serverVersion);
             assertTrue(new File(targetDirectory + serverType.getName() + serverVersion + ".jar").exists());
@@ -109,12 +120,6 @@ public class JarDownloaderTest {
         if (!target.exists() && !target.mkdirs()) {
             throw new IllegalArgumentException("Unable to create the test files directory");
         }
-        File[] oldFiles = target.listFiles();
+        CommonFunctions.removeFilesRecursively(target);
-        if (oldFiles == null) {
-            throw new IllegalArgumentException("Unable to list files in jar test directory");
-        }
-        for (File file : oldFiles) {
-            assertTrue(file.delete());
-        }
     }
 }

src/test/java/net/knarcraft/minecraftserverlauncher/utility/UpdaterTest.java

@@ -0,0 +1,23 @@
+package net.knarcraft.minecraftserverlauncher.utility;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class UpdaterTest {
+
+    @Test
+    public void isVersionHigherTest() {
+        assertTrue(Updater.isVersionHigher("1.1.1", "1.1.2"));
+        assertFalse(Updater.isVersionHigher("1.1.1", "1.1.1"));
+        assertFalse(Updater.isVersionHigher("1.1.1", "1.1.0"));
+        assertTrue(Updater.isVersionHigher("1.1.1", "1.2.1"));
+        assertFalse(Updater.isVersionHigher("1.2.1", "1.1.6"));
+        assertTrue(Updater.isVersionHigher("1.2.1", "2.1.6"));
+        assertTrue(Updater.isVersionHigher("1.2.1", "2.0.0"));
+        assertTrue(Updater.isVersionHigher("1.2", "1.2.1"));
+        assertTrue(Updater.isVersionHigher("1.1.2", "1.2"));
+    }
+
+}