What causes following stuck thread ?

Question

The StuckThreadMaxTime = 600 seconds.
Here is:
            "[STUCK] ExecuteThread: '4' for queue: 'weblogic.kernel.Default (self-tuning)'" id=55 idx=0xdc tid=3147 prio=1 alive, native_blocked, daemon
                at java/util/HashMap.containsKey(HashMap.java:415)[optimized]
                at com/sun/faces/mgbean/BeanManager.isManaged(BeanManager.java:135)[inlined]
                at com/sun/faces/application/WebappLifecycleListener.handleAttributeEvent(WebappLifecycleListener.java:264)[inlined]
                at com/sun/faces/application/WebappLifecycleListener.requestDestroyed(WebappLifecycleListener.java:97)[inlined]
                at com/sun/faces/config/ConfigureListener.requestDestroyed(ConfigureListener.java:283)[optimized]
                at weblogic/servlet/internal/EventsManager.notifyRequestLifetimeEvent(EventsManager.java:335)[inlined]
                at weblogic/servlet/internal/RequestEventsFilter.doFilter(RequestEventsFilter.java:29)[optimized]
                at weblogic/servlet/internal/FilterChainImpl.doFilter(FilterChainImpl.java:56)[inlined]
                at weblogic/servlet/internal/WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)[inlined]
                at weblogic/servlet/internal/WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)[optimized]
                at weblogic/security/acl/internal/AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)[optimized]
                at weblogic/security/service/SecurityManager.runAs(SecurityManager.java:120)[inlined]
                at weblogic/servlet/internal/WebAppServletContext.securedExecute(WebAppServletContext.java:2277)[inlined]
                at weblogic/servlet/internal/WebAppServletContext.execute(WebAppServletContext.java:2183)[optimized]
                at weblogic/servlet/internal/ServletRequestImpl.run(ServletRequestImpl.java:1454)[optimized]
                at weblogic/work/ExecuteThread.execute(ExecuteThread.java:209)[optimized]
                at weblogic/work/ExecuteThread.run(ExecuteThread.java:178)
                at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method)
                -- end of trace

Answer 1

Hi,
Tanks for response !
But, -XX:+PrintConcurrentLocks does not work with JRockit.
Is this default JRockit option, as noticed in the article ?
Pierluigi Vernetto wrote:
You should start the JVM option -XX:+PrintConcurrentLocks (see http://www.javamonamour.org/2011/09/nice-to-activate-sun-jvm-flags-for-gc.html ) , and get more info on who is holding a lock on the same object