Hi,

i have 2 classes:

The StateHandler class creates 2 objects statePlay and stateEdit and starts the execute method

1. public class StateHandler
   {
      
       PlayState statePlay;
       EditState stateEdit;
       State state;
       State oldState;
   
      
       StateHandler()
       {
           state_1 = new PlayState(this);
           state_2 = new EditState(this);
       }
      
       public boolean changeState()
       {
           ....
           ....
           return true;
       }
      
       void runState()
       {   
           state.execute();
       }
      
   
   }
   

In the Edit State Class creates an Button. If i press this button a method in the StateHanlder is called.

1. public class EditState extends PApplet  implements State
   {
       public StateHandler stateHandler;
   
       public EditState(StateHandler d)
       {
           this.stateHandler = d;
       }
      
       public EditState()
       {
       }
      
       public void setup()
       {
           size(400,600);
             noStroke();
             cp5 = new ControlP5(this);
   
             cp5.addButton("Change")
                .setValue(0)
                .setPosition(66,0)
                .setSize(65,20)
                ;
       }
      
       public void draw()
       {
   
       }
      
       public void controlEvent(ControlEvent theEvent) {
             println(theEvent.getController().getName());
           }
   
       void Change(int theValue)
       {
               stateHandler.changeState();
       }
      
       public boolean execute()
       {
           PApplet.main(new String[] { "--present", "EditState" });
           return true;
       }
   
   }
   

in the main class i start the programm with:

StateHandler statehandler = StateHandler();
       
StateHandler.runState();

If i press my change button i got the message:

controlP5.ControlBroadcaster printMethodError
Schwerwiegend: An error occured while forwarding a Controller event, please check your code at Change
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

Can anyone tell me why this cause an error?