I'm having problems using registerSize(Object o)  Running the code below from the PDE results in the following error message being written to the console:

java.lang.IllegalArgumentException: wrong number of arguments
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

I'm running Processing version 0124 from Linux, and am using the version of Java that ships with Processing. In the meantime I will build the latest Processing source code and see if the problem persists.

Here is the code that is causing the problem:

void setup() {

 Widget w = new Widget(this, 20, 20, 100, 100);
 registerSize(w);
 registerDraw(w);
 size(400, 400);
}

void draw() {
 // Do nothing.
}

public class Widget {
 public Widget(PApplet p, int x, int y, int w, int h) {
   this.p = p;
   this.x = x;
   this.y = y;
   this.width = w;
   this.height = h;
 }

 public void size(int w, int h) {
   this.width = w;
   this.height = h;
 }



 public void draw() {
   this.p.rect(this.x, this.y, this.width, this.height);
 }

 private PApplet p;
 private int x;
 private int y;
 private int width;
 private int height;
}

as it says in the reference, do not put any code before size(). size() must be the first thing in setup, otherwise you'll have problems. changes in the most recent source may have contributed to it working, but do not put anything before size().