drawing on Jpanel with mouseMotionListener{Resolved}

[System_Error]

I have been trying to make something that draws on the application whever the mouse goes but I cant seem to get the code to make it draw. I have worked for hours on this trying diffrent ways. anyways here is what i tryed last:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class MouseDraw extends JFrame implements
{

public MouseDraw()
{
MouseDrawPanel mdp = new MouseDrawPanel();
mdp.addMouseMotionListener(this);
FlowLayout flo = new FlowLayout();
Container pane = getContentPane();
pane.setLayout(flo);
pane.add(mdp);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
super("Draw");
setSize(100,100,300,300);
setVisible(true);
}



public static void main(String[] args)
{
MouseDraw md = new MouseDraw();
}
}

class MouseDrawPanel extends JPanel implements MouseMotionListener
{
int x;
int y;
public void mouseMoved(MouseEvent e)
{
x = e.getX();
y = e.getY();
}
public void mouseDragged(MouseEvent e)
{
}

public void paintComponent(Graphics comp)
{
super.paintComponent(comp);
Graphics2D comp2D = (Graphics2D)comp;
comp2D.setColor(Color.red);
comp2D.fillRect(x,y,20,20);
}
}







can anybody get this to work?????