Please, ignore this... I was seeing these references, when I was navigating through the memory using JVMTI. Those runnables were being executed at the same time the printReferences was called. If I waited 5 seconds to print the references, all of this went away. <br>!--!-- FieldReference final java.lang.Runnable java.util.concurrent.Executors$RunnableAdapter.task=OBJ(java.util.concurrent.Executors$RunnableAdapter@884010469) | <br>!--!--!-- FieldReference private final java.util.concurrent.Callable java.util.concurrent.FutureTask$Sync.callable=OBJ(java.util.concurrent.FutureTask$Sync@1691493474) | <br>!--!--!--!-- FieldReference private final java.util.concurrent.FutureTask$Sync java.util.concurrent.FutureTask.sync=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@490829456) | <br>!--!--!--!--!-- arrayRef [Ljava.lang.Object;[6] id=@885978865 | <br>!--!--!--!--!--!-- FieldReference private transient java.lang.Object[] java.util.PriorityQueue.queue=OBJ(java.util.PriorityQueue@1602698930) | <br>!--!--!--!--!--!--!-- FieldReference private final java.util.PriorityQueue java.util.concurrent.DelayQueue.q=OBJ(java.util.concurrent.DelayQueue@673532189) | <br>!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.DelayQueue::take | <br>!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.DelayQueue::take | <br>!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.DelayQueue::take | <br>!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.DelayQueue::take | <br>!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.DelayQueue::take | <br>!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.DelayQueue java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.dq=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue@669197186) | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue::take | <br>!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.BlockingQueue java.util.concurrent.ThreadPoolExecutor.workQueue=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor@1456146415) | <br>!--!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ThreadPoolExecutor::getTask | <br>!--!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ThreadPoolExecutor::getTask | <br>!--!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ThreadPoolExecutor::getTask | <br>!--!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ThreadPoolExecutor::getTask | <br>!--!--!--!--!--!--!--!--!--!-- Reference inside a method - java.util.concurrent.ThreadPoolExecutor::getTask | <br>!--!--!--!--!--!--!--!--!--!-- StaticFieldReference private static java.util.concurrent.ScheduledThreadPoolExecutor org.jboss.messaging.core.client.impl.ConnectionManagerImpl.pingExecutor | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ThreadPoolExecutor java.util.concurrent.ThreadPoolExecutor$Worker.this$0=OBJ(java.util.concurrent.ThreadPoolExecutor$Worker@431709193) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ThreadPoolExecutor java.util.concurrent.ThreadPoolExecutor$Worker.this$0=OBJ(java.util.concurrent.ThreadPoolExecutor$Worker@1871151428) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ThreadPoolExecutor java.util.concurrent.ThreadPoolExecutor$Worker.this$0=OBJ(java.util.concurrent.ThreadPoolExecutor$Worker@1155557696) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ThreadPoolExecutor java.util.concurrent.ThreadPoolExecutor$Worker.this$0=OBJ(java.util.concurrent.ThreadPoolExecutor$Worker@1608577782) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ThreadPoolExecutor java.util.concurrent.ThreadPoolExecutor$Worker.this$0=OBJ(java.util.concurrent.ThreadPoolExecutor$Worker@1567434291) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ScheduledThreadPoolExecutor java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.this$0=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@729155693) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.ScheduledExecutorService org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.pingExecutor=OBJ(org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl@148643588) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ScheduledThreadPoolExecutor java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.this$0=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@490829456) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.ScheduledExecutorService org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.pingExecutor=OBJ(org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl@1278255007) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ScheduledThreadPoolExecutor java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.this$0=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@729302055) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.ScheduledExecutorService org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.pingExecutor=OBJ(org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl@1690464956) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ScheduledThreadPoolExecutor java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.this$0=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@435865682) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.ScheduledExecutorService org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.pingExecutor=OBJ(org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl@527797457) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ScheduledThreadPoolExecutor java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.this$0=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@1584397689) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.ScheduledExecutorService org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.pingExecutor=OBJ(org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl@174736223) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ScheduledThreadPoolExecutor java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.this$0=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@1181554512) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.ScheduledExecutorService org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.pingExecutor=OBJ(org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl@605399375) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ScheduledThreadPoolExecutor java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.this$0=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@169776139) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.ScheduledExecutorService org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.pingExecutor=OBJ(org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl@1569284957) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference final java.util.concurrent.ScheduledThreadPoolExecutor java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.this$0=OBJ(java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@1725603492) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private final java.util.concurrent.ScheduledExecutorService org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.pingExecutor=OBJ(org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl@451237309) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!--!--!--!--!--!-- FieldReference private java.lang.Object java.lang.ref.Reference.referent=OBJ(java.lang.ref.Finalizer@1188706162) | <br>!--!--!--!--!--!--!--!--!--!--!--<b>MaxLevel</b> | <br>!--!--!--!--!-- FieldReference final java.util.concurrent.FutureTask java.util.concurrent.FutureTask$Sync.this$0=OBJ(java.util.concurrent.FutureTask$Sync@1691493474) | <br>!--!--!--!--!--!-- object instanceOf class java.util.concurrent.FutureTask$Sync@1691493474 was already described before on this report | <br>!--!--!--!--!-- FieldReference private java.util.concurrent.ScheduledFuture org.jboss.messaging.core.remoting.impl.RemotingConnectionImpl.future=OB | ... | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4225460#... 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