If this sort of thing happens, take several thread dumps and look for threads that aren't progressing. As with the MessageDispatcherThread here though, a thread that's "not progressing" because it's sitting in wait() is usually not an issue. Look for threads that aren't progressing while they wait to acquire a lock; then find the thread the holds the lock. No guarantee that you'll find your problem, but it's an approach that often helps. Here I *suspect* there was something going on with one of the transactions referred to in the log messages at the end. No idea what though. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4131108#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...