Run Java2Demo on a debug build and it will crash with the following stacktrace:
FATAL ERROR in native method: Calling other JNI functions in the scope of Get/ReleasePrimitiveArrayCritical or Get/ReleaseStringCritical
        at sun.java2d.loops.Blit.Blit(Native Method)
        at sun.java2d.SunGraphics2D.renderImage(SunGraphics2D.java:2602)
        at sun.java2d.SunGraphics2D.renderImage(SunGraphics2D.java:2563)
        at sun.java2d.SunGraphics2D.renderingPipeImage(SunGraphics2D.java:2394)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:1928)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2758)
        at sun.awt.image.ImageRepresentation.drawToBufImage(ImageRepresentation.java:716)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2914)
        at TextureChooser.getImageTexture(TextureChooser.java:84)
        at TextureChooser.<init>(TextureChooser.java:61)
        at GlobalControls.<init>(GlobalControls.java:95)
        at Java2Demo.<init>(Java2Demo.java:111)
        at Java2Demo.main(Java2Demo.java:466)
SIGABRT 6* abort (generated by abort(3) routine)
    si_signo [6]: SIGABRT 6* abort (generated by abort(3) routine)
    si_errno [0]: Erreur 0
    si_code [-1]: SI_LWP [pid: 8035, uid: 59261]
        stackpointer=ffbed718

  which makes debugging of may Swing applications impossible.

  The bug is first reproduced on build
java version "1.4.0beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0beta-b21)
Java HotSpot(TM) Client VM (build 1.3.0rc3-Z, interpreted mode)

  It's reproducible on Solaris and Win32. To make it reproduce on
  Win32 run java_g with -classic