ebXML work with J2EE application Examples and Information

I am a graduate student at the University of Magdeburg, Germany. I am interested in learning more about ebXML Messaging and writing some code in J2EE to implement it.
I was hoping to get some help in terms of guidance as to
what are some good sources or tutorials from which I can learn more (whether books or online sources, etc). I am mainly interested in seeing something that will help me to write code in Java that implements ebXML Messaging.

Thanks for all your help.
Feel free to e-mail me at
arukala@cs.uni-magdeburg.de

Thanks again,

Aruk