using mouseDragged() to move an existing drawing in a Java2D program

HI,

I'm currently working my way through a Java2D program, and need to be able to drag an existing drawing to a new position with the mouse. When I try to run this program i get the following error,

Exception in thread "main" java.lang.StackOverflowError

This seems to specifically refer to the line 'PacMan_clickstest pacman = new PacMan_clickstest();' which is called on line 15. Does anybody know why this happening, and how can I correct this error, so I can drag the drawing around the window as required.

My current code is as follows,

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

public class PacMan_clickstest extends JPanel implements MouseListener, MouseMotionListener{
   
    public static int mode = 0;
    private static JButton rightButton;
    private static JButton leftButton;
    int last_x, last_y;
    boolean pressOut = false;
    PacMan_clickstest pacman = new PacMan_clickstest();
   
    public PacMan_clickstest(){
       
        addMouseListener(this);
        addMouseMotionListener(this);
       
    }
   
    public void mousePressed(MouseEvent e) {
        //PacMan_clickstest pacman = new PacMan_clickstest();
       
        last_x = e.getX();
        last_y = e.getY();
        pressOut = pacman.contains(e.getX(), e.getY());
    }
   
    public void mouseDragged(MouseEvent e){
        if ( !pressOut)
            updateLocation(e);
        //repaint();
    }
   
    public void mouseReleased(MouseEvent e) {}
    public void mouseMoved(MouseEvent e){}
    public void mouseClicked(MouseEvent e){}
    public void mouseExited(MouseEvent e){}
    public void mouseEntered(MouseEvent e){}
   
    public void updateLocation(MouseEvent e) {
        //PacMan_clickstest pacman = new PacMan_clickstest();
       
        pacman.setLocation(e.getX() - last_x, e.getY() - last_y);
        last_x = e.getX();
        last_y = e.getY();
       
        repaint();
    }
   
    public void paintComponent(Graphics g) {
        Dimension d = getSize();
       
        Graphics2D g2 = (Graphics2D)g;
       
        int size = 100;
        Ellipse2D.Double head =
                new Ellipse2D.Double(0, 0, size, size);
        Ellipse2D.Double eye =
                new Ellipse2D.Double(size/2-1, size/5-1,
                size/10, size/10);
        GeneralPath mouth = new GeneralPath();
        mouth.moveTo(size, size/4);
        mouth.lineTo(size/8, size/2);
        mouth.lineTo(size, size*3/4);
        mouth.closePath();
        Area pacman = new Area(head);
        pacman.subtract(new Area(eye));
        pacman.subtract(new Area(mouth));
        g2.setPaint(Color.yellow);
        g2.fill(pacman);
        g2.setPaint(Color.black);
        g2.draw(pacman);
    }
   
    public static void main(String[] args) {
        JFrame frame = new JFrame("Drawing stuff");
        Container contentPane = frame.getContentPane();
       
        JPanel panel = new JPanel();
        PacMan_clickstest pacman = new PacMan_clickstest();
       
        leftButton = new JButton("Left");
        //leftButton.addActionListener(pacman);
        panel.add(leftButton);
       
        rightButton = new JButton("Right");
        //rightButton.addActionListener(pacman);
        panel.add(rightButton);
       
        contentPane.add(panel, BorderLayout.SOUTH);
        contentPane.add(pacman, BorderLayout.CENTER);
       
        frame.setSize(600, 600);
        frame.setVisible(true);
       
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}

Any help or advice is appreciated.

Thanks