Beryl support in AWT/Swing as a NonReparenting WM

FULL PRODUCT VERSION :
java version "1.6.0-internal"
Java(TM) SE Runtime Environment (build 1.6.0-internal-brad_30_dec_2006_20_53-b00)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0-internal-brad_30_dec_2006_19_05-b00, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux the-uberbeast 2.6.19-gentoo-r2 #1 SMP Thu Dec 21 20:16:21 UTC 2006 x86_64 Dual Core AMD Opteron(tm) Processor 285 AuthenticAMD GNU/Linux


EXTRA RELEVANT SYSTEM CONFIGURATION :
nvidia-drivers-1.0.9631, AIGLX, Beryl-0.1.3

A DESCRIPTION OF THE PROBLEM :
Similar to bug report 6429775, grey windows when using Swing applications (MatLAB 2006b's Desktop) while running Beryl Window Manager. Verified that previous example code:

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 ();
}

}

still fails on jdk6u1 binary snapshot. Likely due to only "compiz" being detected in AWT as Non-reparenting.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run above test code under Beryl WM. Judging by what I've found online, underlying 3d support (AIGLX vs. XGL) should not matter.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Application window showing "WmTest" text inside
ACTUAL -
Application window is all grey

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
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 ();
}

}
---------- END SOURCE ----------