There was an OutOfMemory error on our server during the same period. Hope this could be the culprit here (see below). We're also making sure we're on SP4 right now (we should be). I'm still attempting to determine how often or even if we ever set the Exception Listener. What role would it play in this? 2007-04-27 01:54:00,657 ERROR [org.jboss.jms.client.container.ConnectionAspect] Caught exception from connection 2007-04-27 01:54:11,207 FATAL [org.jboss.serial.persister.RegularObjectPersister] error java.lang.reflect.InvocationTargetException at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.serial.persister.RegularObjectPersister.writeSlotWithMethod(RegularObjectPersister.java:120) at org.jboss.serial.persister.RegularObjectPersister.defaultWrite(RegularObjectPersister.java:86) at org.jboss.serial.persister.RegularObjectPersister.writeData(RegularObjectPersister.java:62) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.describeObject(ObjectDescriptorFactory.java:275) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectOutput.writeObject(DataContainer.java:202) at org.jboss.serial.persister.ObjectOutputStreamProxy.writeObjectOverride(ObjectOutputStreamProxy.java:60) at java.io.ObjectOutputStream.writeObject(Unknown Source) at EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap.writeObject(ConcurrentHashMap.java:1190) at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.serial.persister.RegularObjectPersister.writeSlotWithMethod(RegularObjectPersister.java:120) at org.jboss.serial.persister.RegularObjectPersister.defaultWrite(RegularObjectPersister.java:86) at org.jboss.serial.persister.RegularObjectPersister.writeData(RegularObjectPersister.java:62) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.describeObject(ObjectDescriptorFactory.java:275) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectOutput.writeObject(DataContainer.java:202) at org.jboss.serial.persister.RegularObjectPersister.writeSlotWithFields(RegularObjectPersister.java:182) at org.jboss.serial.persister.RegularObjectPersister.defaultWrite(RegularObjectPersister.java:90) at org.jboss.serial.persister.RegularObjectPersister.writeData(RegularObjectPersister.java:62) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.describeObject(ObjectDescriptorFactory.java:275) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectOutput.writeObject(DataContainer.java:202) at org.jboss.serial.io.JBossObjectOutputStream.writeObjectOverride(JBossObjectOutputStream.java:181) at java.io.ObjectOutputStream.writeObject(Unknown Source) at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.sendObject(JavaSerializationManager.java:86) at org.jboss.remoting.marshal.serializable.SerializableMarshaller.write(SerializableMarshaller.java:104) at org.jboss.jms.server.remoting.JMSWireFormat.write(JMSWireFormat.java:310) at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.versionedWrite(MicroSocketClientInvoker.java:885) at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.transport(MicroSocketClientInvoker.java:537) at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:122) at org.jboss.remoting.LeasePinger.sendClientPing(LeasePinger.java:257) at org.jboss.remoting.LeasePinger.access$100(LeasePinger.java:20) at org.jboss.remoting.LeasePinger$LeaseTimerTask.run(LeasePinger.java:274) at java.util.TimerThread.mainLoop(Unknown Source) at java.util.TimerThread.run(Unknown Source) Caused by: java.lang.OutOfMemoryError: Java heap space 2007-04-27 01:54:23,456 WARN [org.jboss.jms.server.connectionmanager.SimpleConnectionManager] A problem has been detected with the connection to remote client 4shm3g-uzu2x6-f0y4rnad-1-f0y5v8kw-a. It is possible the client has exited without closing its connection(s) or there is a network problem. All connection resources corresponding to that client process will now be removed. 2007-04-27 01:54:11,206 ERROR [STDERR] Exception in thread "WorkerThread#8[172.17.22.122:56839]" 2007-04-27 01:54:23,457 ERROR [STDERR] java.lang.OutOfMemoryError: Java heap space View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4041591#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...