JDialog Dispose and WindowClosing

Question

Hi all. I'm trying to get my JDialog to correctly close when it is disposed, but with no luck. Here's a sample code showing the problem. The application will not correctly end because the JDialog is still around.
public class TestJDialog {
     public TestJDialog() {
          super();
     public static void main(String[] args) {
          JDialog d = new JDialog((Frame) null, "Hello");
          d.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
          d.addWindowListener(new JDialogWindowAdapter(d));
          d.show();
          //This line will hang your system.
          //Should end the program but doesn't.  This only way
          //this program will end is if you remove the bottom
          //line and click on the x in the dialog.
          d.dispose();
class JDialogWindowAdapter extends WindowAdapter {
     private JDialog m_dialog = null;
      * Constructs the adapter.
      * @param d the dialog to listen to.
     public JDialogWindowAdapter(JDialog d) {
          m_dialog = d;
     public void windowClosing(WindowEvent e) {
          super.windowClosing(e);
          //Dispose the hidden parent so that there are
          //no more references to the dialog and it can
          //be correctly garbage collected.
           ((Window) m_dialog.getParent()).dispose();
}I've looked through the forums, but a lot of people say use EXIT_ON_CLOSE, but that's not possible with my program. I just need to find a way to correctly fire the window closing event using dispose.
Thanks!

Answer 1

I think I know why the first one fails but the second on works.
public static void main(String[] args) {          
JDialog d = new JDialog((Frame) null, "Hello");
d.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
d.addWindowListener(new JDialogWindowAdapter(d));
d.show();
System.out.println( d.getParent() instanceof JFrame);
System.out.println( d.getParent().getClass().getName());
((Window)d.getParent()).dispose();
d.dispose();
prints out:
false
javax.swing.SwingUtilities$1 <----------What is that?????!!!!?!!?!?!?!?!?
public static void main(String[] args) {           
   JFrame frame = new JFrame(); 
   try {   
      JDialog d = new JDialog(frame, "Hello");             
      d.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);             
      d.show();  
      System.out.println( d.getParent() instanceof JFrame);
      System.out.println( d.getParent().getClass().getName());
      //d.dispose(); 
   } finally {  
      frame.dispose(); 
prints out:
true
javax.swing.JFrame <---------Yeah! It's correct
So JFrames correctly terminate, but whatever the hell that class is doesn't. What is that?