java - "Exception in thread "Animation Thread" error when using Processing in Eclipse -

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i have created simple processing sketch in eclipse classes.eclipse says code contains no errors, warnings, fails @ runtime , console displays following errors:

exception in thread "animation thread" java.lang.nullpointerexception @ processing.core.papplet.ellipse(papplet.java:12174) @ assignment.tracking.display(tracking.java:15) @ assignment.assignment.draw(assignment.java:16) @ processing.core.papplet.handledraw(papplet.java:2386) @ processing.core.pgraphicsjava2d.requestdraw(pgraphicsjava2d.java:240) @ processing.core.papplet.run(papplet.java:2256) @ java.lang.thread.run(unknown source)

the code following:

package assignment;  import processing.core.*;    public class assignment extends papplet {       tracking tracking;       public void setup() {          size(500, 500);          tracking = new tracking();      }         public void draw() {          tracking.display();      }  }

and code tracking class is: 

    package assignment;     import processing.core.*;        public class tracking extends papplet     {       int test;        public tracking() {       test = 100;       }        void display(){           ellipse(test, test, test, test);       }     }

i believe have imported necessary processing .jar files. in advance help

it looks problem setup in assignment class, calls ellipse() tracking class. note assignment , tracking 2 different papplets. call size(500, 500) in assignment, tracking has no defined size.


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