I've got the same problem.
I'm running JBoss 2.4.3 under Oracle 8i on an NT system.
As my code doesn't catch a NPE; JBoss returns the following:
Thread-13] ERROR com.everypath.alerts.aflow.server.subscribe.SubscriptionBean S
ubscription - Exception occurred while getting subscription form
This bug was fixed in august in 2.5/3...I'll see if I can figure out how to get it into the 2.4 branch.
My code shouldn't need to catch NPE. I've to do this only as a work-around the bug.
By the way, what is this 2.5 release? There is a way to fetch it out from CVS using some tag?