Daniel Cullender [http://community.jboss.org/people/cullendw] replied to the discussion "Possible Deadlock Jboss 4.2.3" To view the discussion, visit: http://community.jboss.org/message/545044#545044 -------------------------------------------------------------- It looks like we did not have a deadlock at all, but rather a bottleneck. Using JBoss Profiler  ( http://www.jboss.org/jbossprofiler http://www.jboss.org/jbossprofiler) we determined that a bottleneck caused a backlog and since we use Semaphores to enable FIFO processing of messages, the locked threads built up causing the appearance of a deadlock. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/545044#545044] Start a new discussion in EJB 3.0 at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]