Hey,
I have a main class which contains a jframe (contains public static void main(String[] args)
There is a panel in this jframe which contains the PApplet class.

How do I get the runnable jar file to work?

I tried using PApplet.main("PAppletclassName"); in the main class which contains the jframe. But it gives me the error:  java.lang.RuntimeException: java.lang.InstantiationException

Here is how the code works:

1. public class MainMenu {
         public static void main(String[] args) {
                 PApplet.main("GameEngine");
                 MainMenu mainMenu = new MainMenu();
          }
   
         public MainMenu() {
               JPanel enginePanel = new JPanel();
               PApplet gameEngine =  new GameEngine();
               enginePanel.add(gameEngine);
               gameEngine.init();
         }
   }
   

1. public class GameEngine extends PApplet {
         public GameEngine() {
         }
   }