Taking a thread dump is a function of the JVM, not of JBoss. Perhaps JRockit is placing the threadump somewhere else, like the IBM JVM does. You would have the check the JRockit documentation for details. Or it might not even support a thread dump, in which case I suggest trying the Sun JVM just long enough to track down this problem. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3973072#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...