Some minor modifications...

src/graphics/guiSkeleton/guiPanel/menuPanel/ServerAddressPanel.java

@@ -57,7 +57,7 @@ public class ServerAddressPanel extends MenuPanel{
     private ActionListener serverButtonActionListener = new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent actionEvent) {
-            RPCServer.main();
+            RPCServer.startServer();
             getGraphicsMaster().changeGUIStateTo(GraphicsMaster.GUIStates.SERVER_CREATED_PANEL);
         }
     };

src/network/innershell/LoungeServer.java

@@ -8,7 +8,7 @@ import network.outershell.Lounge;
 /**
  * Created by bogdanbear on 20/11/2015.
  */
-public class LoungeServer {
+public class LoungeServer extends Thread {
     private Lounge lounge;
     private int numberOfPlayers;
     public LoungeServer(Lounge lounge, int numberOfPlayers)
@@ -16,12 +16,27 @@ public class LoungeServer {
         this.lounge=lounge;
         this.numberOfPlayers=numberOfPlayers;
     }
-    public void initiateServer()
+    @Override
+    public void run()
     {
         ServerConnection serverConnection=new ServerConnection(lounge.getPort(),0, true,lounge.MAX_PLAYERS);
         Logging.getInstance().getLogger().info("Server started second phase, initialization done");
 
         ServerLoop dummyServerLoop=new ServerLoop(serverConnection);
         dummyServerLoop.start();
+        notifyOnIt();
+    }
+
+    public synchronized void notifyOnIt()
+    {
+        notify();
+    }
+    public synchronized void waitOnIt()
+    {
+        try {
+            wait();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
     }
 }

src/network/outershell/server/RPCServer.java

@@ -14,7 +14,7 @@ import java.util.logging.Logger;
 public class RPCServer {
     public static int scale=25;
     private static Logger LOGGER = Logging.getInstance().getLogger();
-    public static void main()
+    public static void startServer()
     {
         try {
             LocateRegistry.createRegistry(1099);
@@ -24,5 +24,9 @@ public class RPCServer {
             LOGGER.warning("RPCServer: Server failed: " + e);
         }
     }
+    public static void main(String[] arguments)
+    {
+        startServer();
+    }
 }
 

src/network/outershell/server/Registrar.java

@@ -67,7 +67,8 @@ public class Registrar extends UnicastRemoteObject implements RegisterInterface
         waiting.put(genID, lounge);
         //instantiate a loungeServer on the serverside and then put it into motion
         LoungeServer loungeServer=new LoungeServer(lounge,lounge.MAX_PLAYERS);
-        loungeServer.initiateServer();
+        loungeServer.start();
+        loungeServer.waitOnIt();
 
         //after obtaining the genID the host will immediately launch joinGame
         return lounge;