Failed to process message

hi all
  i use openjms-0.7.7-alpha-1 and http connnector with tomcat
  the server often throw this exception as follow

23:40:59.488 ERROR [RMI TCP Connection(85996)-ip] - Failed to process message
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
	at java.util.HashMap$ValueIterator.next(HashMap.java:817)
	at java.util.AbstractCollection.toArray(AbstractCollection.java:126)
	at org.exolab.jms.messagemgr.ConsumerManager.hasActiveConsumers(ConsumerManager.java:553)
	at org.exolab.jms.messagemgr.DestinationManager.messageAdded(DestinationManager.java:599)
	at org.exolab.jms.messagemgr.MessageMgr.addNonPersistentMessage(MessageMgr.java:282)
	at org.exolab.jms.messagemgr.MessageMgr.add(MessageMgr.java:229)
	at org.exolab.jms.server.JmsServerSession.send(JmsServerSession.java:221)
	at org.exolab.jms.server.net.RemoteServerSession.send(RemoteServerSession.java:152)
	at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.exolab.jms.net.orb.DefaultORB$Handler.invoke(DefaultORB.java:442)
	at org.exolab.jms.net.orb.DefaultORB$Handler.invoke(DefaultORB.java:468)
	at org.exolab.jms.net.connector.ContextInvocationHandler.invoke(ContextInvocationHandler.java:108)
	at org.exolab.jms.net.rmi.RMIManagedConnection.invokeLocal(RMIManagedConnection.java:374)
	at org.exolab.jms.net.rmi.RMIInvokerImpl.invoke(RMIInvokerImpl.java:91)
	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
	at sun.rmi.transport.Transport$1.run(Transport.java:153)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
	at java.lang.Thread.run(Thread.java:595)


	why?
	thank you !

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