java - Can't draw oval on JPanel -

i'm trying draw ovals on jpanel when mouse clicked. code doesn't call paintcomponent, nothing happens on jpanel. part i'm missing?

 public class main extends jframe implements mouselistener{         jpanel thepanel = new jpanel(){             @override              protected void paintcomponent(graphics g)                {                   super.paintcomponent(g);                 g.setcolor(color.red);                 (circle c : circles){                       g.filloval(c.x, c.y, c.diameter, c.diameter);                       system.out.println(c.x + "a");                 }                 }         };         jframe frame=new jframe();         int x,y;         arraylist<circle >circles = new arraylist<circle>();         public static void main(string[] args) {             swingutilities.invokelater(new runnable() {                 @override                 public void run() {                     new main();                 }             });         }     public main(){          frame.setsize(512,512);         frame.setdefaultcloseoperation(jframe.exit_on_close);          frame.addmouselistener(this);         frame.add(thepanel);         frame.setvisible(true);      }         @override     public void mouseclicked(mouseevent e) {             system.out.println(e.getx());             circle c = new circle();             c.x=e.getx();             c.y=e.gety();             c.diameter=10;             circles.add(c);             repaint();     } 

circle class

class circle     {       public int x, y, diameter;     } 

i didn't use getters , setters don't think that's problem.

if change repaint() thepanel.repaint(), should able see circles being added.

they appear little off-position, because getting frame-coordinates frame's mouse listener, trying paint in panel-coordinates.

edit:
camickr pointed out in comment, have 2 jframes: 1 instantiated new jframe(), , 1 instantiated new main(). reason repaint not having desired effect: 1 calling repaint on not 1 looking at. camickr suggests not inherit main jframe, advice.