I am having trouble drawing from within a Java class that is linked to Processing.
All my java instances and variables, I have no problems with. But what I'm trying to do is have several classes of objects with different behaviors and images, and I'd love to store all this info and class like a class's draw method from the Processing file and have the code for drawing each class within the class.

When I call a translate or ellipse or anything from within my java class, I am getting a null pointer exception.

Anyone know a work around?

What do you mean by linking them to the PApplet?

Heres a simplified example of what I'm trying to do.
In my main .pde Processing file, I have:
import processing.core.*;


public class testing_java extends PApplet{

Atom a;

void setup(){
 size(screen.width, screen.height, P3D);
 a = new Atom();
}

void draw(){
 background(0);
 a.atomDraw();
}

}


And my .java file consists of:

import processing.core.*;


public class Atom extends PApplet {
 
 public Atom(){  
 }
 
 public void atomDraw(){
  ellipse(56, 46, 55, 55);  
 }
 
}



And I'm getting the null pointer exception on the ellipse call from within the atom class.....

Any suggestions?