Sorry, forgot to include system config above
jboss-4.0.3 (eJB3 configuration)
sun jdk 1.5 update 5
debian linux kernel 2.6.12
Posting the exception stack trace and message might help, at the moment we only know that you are experiencing one of the most common exceptions that you could see.
Also can you describe your packaging, what lives where? Are any classes packaged in the war as well as the ejb jar file? This is a common cause of class cast exceptions as the classes get loaded by two different classloaders so look different.
You hit the nail right on the head. I mistakenly included some classes in my web archive that were already included in my ejb3 and persistence archives. After correcting this things seem to be working.
Thank you very much!