Makes the software build Spigot and CraftBukkit jars if the latest version is chosen

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();
+        }
     }
 
 }