Hej,
i have a problem handling the control events/values of a scrollList correctly. I want to use scrollList with a fixed id an allocate the selected values to a public variable (as it works for a single buttom event).

As i do it i get:
"ERROR. an error occured while forwarding a Controller value
to a method in your program. please check your code for any
possible errors that might occur in this method .
e.g. check for casting errors, possible nullpointers, array overflows ... .
method: controlEvent
exception:  java.lang.reflect.InvocationTargetException"

example code:

import controlP5.*;
ControlP5 controlP5;

public int a;  //controller value from button
public int b;  //controller value from list

void setup() {
 size(400,400);
 frameRate(30);
 controlP5 = new ControlP5(this);
 
 controlP5.addNumberbox("myButton",a,100,160,100,14).setId(1);
 ScrollList l = controlP5.addScrollList("myList",100,100,120,280);
 

 l.setLabel("List");
 for(int i=0;i<4;i++) {
   controlP5.Button b = l.addItem("a"+i,i);
   b.setId(2);                                       // fixed id 2 for scroll list
 }
}

void draw() {
 background(0);
 
 //println("controller value from button " + a);
 //println("controller value from list " + b);
}

void controlEvent(ControlEvent theEvent) {
 switch(theEvent.controller().id()) {
   case(1):
   /*events from my button*/
   a = (int)(theEvent.controller().value());
   break;
   case(2):
   /* events from myList */
   b = (int)(theEvent.controller().value());
   break;  
 }
}

void myList(int theValue) {
 println("123");
}

Ahhhh ok! Thanks for the explanation -i was not aware of that there are two control events in this case. Thanks for your fast help - the workaround is perfect!
Greets apollo