The jconsole live thread list section is based on obtaining the ThreadMXBean.getAllThreadIds and then querying the ThreadMXBean.getThreadInfo for each thread id. For some reason the getThreadInfo is failing with a
"javax.management.InstanceNotFoundException: java.lang:type=Threading is not registered." while the getAllThreadIds call works fine. The result is that there is no active thread list while the MBeans tab shows the ThreadMXBean and the thread counts are correct. This is using the configuration described in http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossMBeansInJConsole