In my setup, the threads do not have process ids, so I cannot tell if the Java stack dump (jstack output) mentions the process id associated with each thread. But based on your observations, I would say that it doesn't. None the less, the thread identified as pid 21998 is in the jstack output. Like I wrote earlier, you might have to take several stack dumps, and compare them, to identify the busy thread. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4200452#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...