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In SJSAS 8.2, the MDB container spawns a new thread to handle each message on the queue. The thread should be short-lived (only as long as it takes to run the onMessage method), but you could certainly see the type of build-up you're describing.
In SJSAS 9.x, the MDBs are handed by the thread-pool-1 threadpool in your domain.xml, which will be more efficient. So if its possible to upgrade, that would take care of your issue.
Thanks. That pretty much explains it - like I said there's no thread leak i.e. the live and peak thread counts stays pretty much constant over the processing.