Adds various fixes to make the two java versions work as expected

Makes it possible to load a controller without generating a GUI, for better testing
Makes sure not to try and parse empty profile lines
Saves controller settings in a more readable and appendable format
Adds code for using the correct java version for the occasion
Adds a new function for writing to files

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

@@ -1,7 +1,7 @@
 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.Server;
 import net.knarcraft.minecraftserverlauncher.userinterface.ServerConsoles;
 import net.knarcraft.minecraftserverlauncher.userinterface.ServerLauncherGUI;
@@ -28,7 +28,7 @@ import java.util.concurrent.TimeUnit;
 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;
@@ -42,7 +42,7 @@ public class Main {
         }
         EventQueue.invokeLater(() -> {
             try {
-                new ServerConsoles();
+                ServerConsoles.instantiate();
                 controller.loadState();
                 gui = controller.getGUI();
                 ScheduledExecutorService exec = Executors.newSingleThreadScheduledExecutor();
@@ -58,7 +58,7 @@ public class Main {
      *
      * @return <p>The controller used by the software</p>
      */
-    public static Controller getController() {
+    public static ServerLauncherController getController() {
         return controller;
     }
 

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

@@ -8,7 +8,7 @@ import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 
 import javax.naming.ConfigurationException;
 import javax.swing.*;
-import java.io.*;
+import java.io.IOException;
 import java.util.ArrayList;
 
 /**
@@ -230,7 +230,9 @@ 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);

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

@@ -9,16 +9,20 @@ 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 +32,14 @@ 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 +48,9 @@ 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 +91,29 @@ public class Controller {
         return currentProfile.getDelayStartup();
     }
 
+    /**
+     * Gets 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>
+     *
+     * @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;
+    }
+
     @Override
     public String toString() {
         int guiWidth;
@@ -96,7 +125,8 @@ 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 +201,122 @@ 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);
+    }
+
+    /**
+     * 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.readFile(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) {
+                this.serverLauncherGUI = new ServerLauncherGUI(Integer.parseInt(loadedData.get("guiWidth")),
+                        Integer.parseInt(loadedData.get("guiHeight")));
+            } 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 +328,9 @@ 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) {
@@ -248,45 +366,6 @@ public class Controller {
         }
     }
 
-    /**
-     * 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);
-            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

@@ -2,7 +2,7 @@ package net.knarcraft.minecraftserverlauncher.server;
 
 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.servertypes.ServerType;
 import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 
@@ -147,6 +147,7 @@ public class Server {
 
     /**
      * Kills all server processes
+     *
      * @throws InterruptedException <p>If interrupted waiting for any of the servers to stop</p>
      */
     private static void killServers() throws InterruptedException {
@@ -158,6 +159,7 @@ public class 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>
      */
@@ -174,7 +176,7 @@ public class Server {
      * Runs all enabled servers with their settings
      */
     public static void startServers() {
-        Controller controller = Main.getController();
+        ServerLauncherController controller = Main.getController();
         controller.getGUI().setStatus("Starting servers");
         int serverNum = 0;
         for (Collection collection : controller.getCurrentProfile().getCollections()) {
@@ -429,6 +431,23 @@ public class Server {
         }
     }
 
+    /**
+     * 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 &&
+                Integer.parseInt(serverVersion.split("\\.")[1]) >= 17) {
+            return controller.getJavaCommand();
+        } else {
+            return controller.getOldJavaCommand();
+        }
+    }
+
     /**
      * Starts the process running this server
      *
@@ -443,7 +462,7 @@ 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));
@@ -532,6 +551,7 @@ public class Server {
 
     /**
      * 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>
@@ -569,7 +589,7 @@ public class Server {
      * @return <p>True if nothing went wrong</p>
      */
     private boolean initializeJarDownload() {
-        Controller controller = Main.getController();
+        ServerLauncherController controller = Main.getController();
         if (!controller.getDownloadAllJars()) {
             try {
                 controller.getGUI().setStatus("Downloading jar...");

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;

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;
 
@@ -122,8 +125,8 @@ 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);
             }

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;
@@ -77,6 +81,7 @@ public class Console extends KeyAdapter implements ActionListener, KeyListener {
 
     /**
      * 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) {

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

@@ -17,16 +17,22 @@ public class ServerConsoles {
     private static JFrame frame;
     private static JTabbedPane consolesTabbedPane;
 
+    private ServerConsoles() {
+
+    }
+
     /**
      * Initializes the server consoles frame
      */
-    public ServerConsoles() {
+    public static void instantiate() {
+        if (frame == null || consolesTabbedPane == null) {
             frame = new JFrame();
             frame.setBounds(100, 100, 450, 300);
             frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
             consolesTabbedPane = new JTabbedPane(JTabbedPane.TOP);
             frame.getContentPane().add(consolesTabbedPane, BorderLayout.CENTER);
         }
+    }
 
     /**
      * Adds a new console tab

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;
@@ -25,7 +25,7 @@ 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;
 
     /**
@@ -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());
         }
     }

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

@@ -2,7 +2,7 @@ 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.utility.CommonFunctions;
 
@@ -12,15 +12,16 @@ 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.FileWriter;
-import java.awt.event.WindowEvent;
+import java.io.IOException;
-import java.io.*;
+import java.io.PrintWriter;
-import java.util.*;
+import java.util.HashMap;
+import java.util.Map;
+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;
@@ -35,7 +36,7 @@ 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 Controller controller;
+    private final ServerLauncherController controller;
     private Map<String, String> textStrings;
     private Tray applicationTray;
 
@@ -64,6 +65,20 @@ 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
      *
@@ -146,7 +161,7 @@ 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();
@@ -311,7 +326,6 @@ public class ServerLauncherGUI extends MessageHandler implements ActionListener,
     }
 
 
-
     /**
      * Handles buttons and the combo on the main tab
      *

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

@@ -1,7 +1,7 @@
 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.*;
@@ -14,7 +14,7 @@ import java.util.Objects;
  */
 public class ServerLauncherMenu implements ActionListener {
 
-    private JMenuBar menuBar;
+    private final JMenuBar menuBar;
     //Options
     private JCheckBoxMenuItem runInBackgroundCheckBoxMenuItem;
     private JCheckBoxMenuItem delayStartupCheckBoxMenuItem;
@@ -31,8 +31,8 @@ public class ServerLauncherMenu implements ActionListener {
     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
@@ -41,7 +41,7 @@ public class ServerLauncherMenu implements ActionListener {
      * @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();

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;
 
@@ -20,9 +24,9 @@ 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

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/CommonFunctions.java

@@ -6,7 +6,17 @@ 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.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -107,6 +117,17 @@ public final class CommonFunctions {
         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)));
+    }
+
     /**
      * Reads a file from disk
      *
@@ -115,7 +136,28 @@ public final class CommonFunctions {
      * @throws IOException <p>If unable to find or read the file</p>
      */
     public static String readFile(String path) throws IOException {
-        return CommonFunctions.readBufferedReader(new BufferedReader(new InputStreamReader(new FileInputStream(path))));
+        return CommonFunctions.readBufferedReader(getFileReader(path));
+    }
+
+    public static void writeFile(String path, String text) throws IOException {
+        writeFile(path, text, true);
+    }
+
+    /**
+     * 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 = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path)));
+        writer.write(text);
+        if (addTrailingNewline) {
+            writer.newLine();
+        }
+        writer.close();
     }
 
     /**
@@ -262,6 +304,7 @@ public final class CommonFunctions {
 
     /**
      * Removes all files within a folder
+     *
      * @param target <p>The folder to delete from</p>
      */
     static void removeFilesRecursively(File target) {

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

@@ -1,6 +1,7 @@
 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;
 
@@ -21,9 +22,11 @@ public class JarBuilder {
     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>
@@ -33,6 +36,7 @@ public class JarBuilder {
         this.jarDirectory = jarDirectory;
         this.gui = gui;
         this.versionContainer = ServerVersionContainer.getInstance();
+        this.javaCommand = ServerLauncherController.getInstance().getJavaCommand();
     }
 
     /**
@@ -40,7 +44,7 @@ public class JarBuilder {
      */
     public void buildSpigotJar() {
         downloadBuildTools();
-        ProcessBuilder processBuilder = new ProcessBuilder("java", "-jar", "BuildTools.jar", "--rev",
+        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");
@@ -52,7 +56,7 @@ public class JarBuilder {
      */
     public void buildBukkitJar() {
         downloadBuildTools();
-        ProcessBuilder processBuilder = new ProcessBuilder("java", "-jar", "BuildTools.jar", "--compile",
+        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");
@@ -84,6 +88,7 @@ public class JarBuilder {
 
     /**
      * 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>
@@ -108,6 +113,7 @@ public class JarBuilder {
 
     /**
      * Starts the build process and initializes
+     *
      * @param processBuilder <p>The process builder to execute</p>
      * @return <p>True if the process exited successfully</p>
      */
@@ -141,6 +147,7 @@ public class JarBuilder {
 
     /**
      * 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>
      */

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

@@ -5,9 +5,12 @@ import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
 import net.knarcraft.minecraftserverlauncher.Main;
+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;
 
@@ -81,8 +84,9 @@ 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/test/java/net/knarcraft/minecraftserverlauncher/server/ServerTypeHandlerTest.java

@@ -4,7 +4,6 @@ import net.knarcraft.minecraftserverlauncher.server.servertypes.ServerType;
 import org.junit.jupiter.api.Test;
 
 import javax.naming.ConfigurationException;
-
 import java.util.Arrays;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;

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

@@ -5,7 +5,10 @@ import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 import org.junit.jupiter.api.BeforeEach;
 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 net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.createAllFolders;
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -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;\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/utility/JarBuilderTest.java

@@ -1,14 +1,17 @@
 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;
 
@@ -22,6 +25,15 @@ public class JarBuilderTest {
     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 +