Do you have a way to reproduce this? What is your configuration? Which jboss? Does this appear to cause problems (running out of connections, etc)?
Several people have reported this but I haven't found the cause yet.
It seems to appear during a run that involves a 2-phase transaction with a JMS send operation(oracle as persistent store) and a CMP/JDBC transaction (using oracle thin driver XA) . I'm not sure which of the 2 resource managers the "unregistered handle" refers to. I'm using JBoss 3.2.1 but I've seen this also with 3.2.0. This doesnt seem to cause a problem, seems harmless so far.
just configure JMS to use an Oracle XA DS as persistent store, start JBoss 3.2.0 and wait about 20 to 25 minutes... this will bring up this exception.
I'm also seeing this message using the Oracle XA datasource but not as the persistent store to JMS.
It doesn't seem to cause problems but I wonder if it could if the timing was right. Any ideas?