here is a quote from mail from ###@###.###
>We've encountered some difficulties with Xgl/Compiz displaying apps
>using Java 1.5, Swing and the XToolkit running under Xgl/Compiz.
>
>The difficulty seems to be specifically related to the compiz window
>manager rather than Xgl (our testing has shown the window managers
>enlightment and ratpoision also exhibit the behaviour, but not more
>maintstream managers like metacity).  We've created a test case of
>about
>20 lines long to demonstrate the behaviour (attached), which is that
>windows draw with no contents, but the widgets behavior are still
>present (ie click where a top level menu item should be and the menu
>will appear in more complex apps).  MToolkit does not appear to
>have the
>issue, but of course using it for 1.5 apps is not an ideal
>solution.  Do
>you guys have any interest in helping look at this problem or know
>someone who would inside the Java/Swing team?  Even 30 minutes on the
>phone might give us a better understanding why compiz has the issue
>but
>metacity does not so we can correct what we need to.

The test to reproduce the problem:

import javax.swing.*;

public class WmTest extends JFrame {

public WmTest () {
    JLabel l = new JLabel ("WM Test");

    this.getContentPane().add(l);
    this.setSize(256, 256);

    //this.pack();
    this.setVisible (true);
}

public static void
main (String args[]) {
    WmTest r = new WmTest ();
}

}