FULL PRODUCT VERSION :
java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Ubuntu Linux 7.10 (Gutsy Gibbon)

EXTRA RELEVANT SYSTEM CONFIGURATION :
Runtime environment was acquired from Debian package "java-6-sun"

A DESCRIPTION OF THE PROBLEM :
I wrote a video game as a project for a Java class I'm taking at college. The game ran fine on the Windows and Macintosh jres, but when I tried to run it on Ubuntu Linux (after installing the Sun jre), during the course of the program, I got the following error:

Exception in thread "AWT-EventQueue-0" java.lang.InternalError: not implemented yet
        at sun.java2d.x11.X11SurfaceData.getRaster(X11SurfaceData.java:173)
        at sun.java2d.loops.Blit$AnyBlit.Blit(Blit.java:144)
        at sun.java2d.pipe.DrawImage.blitSurfaceData(DrawImage.java:927)
        at sun.java2d.pipe.DrawImage.renderImageCopy(DrawImage.java:550)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:54)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:982)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2979)
        at sun.awt.image.ImageRepresentation.drawToBufImage(ImageRepresentation.java:740)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:989)
        at sun.java2d.pipe.ValidatePipe.copyImage(ValidatePipe.java:168)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2979)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2964)
        at spaceinvader.AlienImpl.drawOnto(AlienImpl.java:308)
        at spaceinvader.ActionWindow.paint(ActionWindow.java:95)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintToOffscreen(JComponent.java:5122)
        at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:285)
        at javax.swing.RepaintManager.paint(RepaintManager.java:1128)
        at javax.swing.JComponent._paintImmediately(JComponent.java:5070)
        at javax.swing.JComponent.paintImmediately(JComponent.java:4880)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:723)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:679)
        at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:659)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

After experimenting, I found that this occurred any time one tried to use a custom implementation of the Composite in a paint() method.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Write a class that implements the java.awt.Composite interface. The implementation can be trivial (i.e., does nothing). Subclass a JComponent, and attempt to use this composite in the paint method. Write an application that displays that component (i.e., in a JFrame). Examples that work on Windows and Macintosh will throw a java.lang.InternalError when that paint method is called. The message says "not implemented yet".

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The paint method should proceed as expected (the details depend on what's actually done there)
ACTUAL -
A java.lang.InternalError was thrown which said "not implemented yet", and no painting was done in the method.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "AWT-EventQueue-0" java.lang.InternalError: not implemented yet
        at sun.java2d.x11.X11SurfaceData.getRaster(X11SurfaceData.java:173)
        at sun.java2d.loops.Blit$AnyBlit.Blit(Blit.java:144)
        at sun.java2d.pipe.DrawImage.blitSurfaceData(DrawImage.java:927)
        at sun.java2d.pipe.DrawImage.renderImageCopy(DrawImage.java:550)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:54)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:982)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2979)
        at sun.awt.image.ImageRepresentation.drawToBufImage(ImageRepresentation.java:740)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:989)
        at sun.java2d.pipe.ValidatePipe.copyImage(ValidatePipe.java:168)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2979)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2964)
        at spaceinvader.AlienImpl.drawOnto(AlienImpl.java:308)
        at spaceinvader.ActionWindow.paint(ActionWindow.java:95)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintToOffscreen(JComponent.java:5122)
        at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:285)
        at javax.swing.RepaintManager.paint(RepaintManager.java:1128)
        at javax.swing.JComponent._paintImmediately(JComponent.java:5070)
        at javax.swing.JComponent.paintImmediately(JComponent.java:4880)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:723)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:679)
        at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:659)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

//paint method paints a small red rectangle using
//a custom compositing rule, but the rectangle is
//never drawn, and the method will cause the
//exception to be thrown.
public void paint(Graphics g) {
Graphics2D gfx = (Graphics2D) g;

//This next line of code sets the compositing rule.
//If this line is commented out, the program will
//run normally.
gfx.setComposite(new MyComposite());

gfx.setColor(Color.RED);
gfx.fillRect(4, 4, 10, 10);

}

/*
The above paint method can be used in a subclass of JComponent to demonstrate
the problem. It assumes that an implementation of java.awt.Component has been
written. Even a trivial implementation will work (i.e., which does nothing). It should
draw a red square, but throws an exception instead.
*/
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Run program on different OS.