We've taken out the functions that were using java.util.HashMap as they were unneccessary for operation and haven't seen the issue since. Our developer related that there may be a chance for things to spin due to the thread-safe issues. For Georges, do you know how to dump thread CPU utilization using ps and correlating to the thread dump TID's from JBoss? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4127909#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...