Hi
The stack trace says it's something to do with compiling and/or parsing XML, so I'd imagine you're using an incompatible version of the JDK, or possibly incorrect versions of certain library files.
JDK: Best results are with 1.4.2_06 to 1.4.2_08, and it must be JDK, not JRE. Anything else has been reported to cause problems.
Library files: Are you using Turnkey Jboss install, or your own. There are several tweaks you need to perform to a standard JBoss to use it for Livecycle. I'd recommend getting it going with the Turnkey JBoss first.
Good luck
Howard
http://www.avoka.com