texture combining with Java2D pipeline enabled

Hi. Could anybody offer suggestions on why the JOGL texture combining code in the following class stops working when the Java2D Pipeline is enabled? A tip about of where I could learn how to make the code accommodate pipelining would be great.

http://jmonkeyengine.googlecode.com/svn/trunk/src/com/jme/scene/state/jogl/JOGLTextureState.java

The texture combining code I’ve been debugging (for my transparency combining problem) is mostly in the apply and applyCombineFactors methods, but most of the class looks relevant.