TCPSession.sendFrame: NullPointerException

Hi

We use the beepcore java library in our diploma project 'a  
collaborative editor'.
When two users collaboratively edit a document, each character is sent  
over a channel by a call to
myChannelImplInstance.sendMSG(outputData, myReplylistener).
Both sides use the same channel. After a while (both users type very  
fast, i.e.
channel.sendMSG(..) is called at a high rate), the following exception  
occurs:

Caused by: java.lang.NullPointerException
         at  
org.beepcore.beep.transport.tcp.TCPSession.sendFrame(TCPSession.java: 
291)
         at  
org.beepcore.beep.core.ChannelImpl.sendFrames(ChannelImpl.java:837)
         at  
org.beepcore.beep.core.ChannelImpl.sendQueuedMessages(ChannelImpl.java: 
773)
         at  
org.beepcore.beep.core.ChannelImpl.sendToPeer(ChannelImpl.java:754)
         at  
org.beepcore.beep.core.ChannelImpl.sendMSG(ChannelImpl.java:414)
         at  
ch.iserver.ace.net.impl.protocol.AbstractConnection.send(AbstractConnect 
ion.java:77)
         at  
ch.iserver.ace.net.impl.protocol.ParticipantConnectionImpl.sendToPeer(Pa 
rticipantConnectionImpl.java:261)
         at  
ch.iserver.ace.net.impl.protocol.ParticipantConnectionImpl.sendRequest(P 
articipantConnectionImpl.java:157)
         at  
ch.iserver.ace.collaboration.jupiter.server.ParticipantConnectionWrapper 
.sendRequest(ParticipantConnectionWrapper.java:177)
         at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
         at  
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor 
Impl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:324)
         at  
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection( 
AopUtils.java:335)
         at  
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinp 
oint(ReflectiveMethodInvocation.java:181)
         at  
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Ref 
lectiveMethodInvocation.java:148)
         at  
ch.iserver.ace.util.AsyncMethodInvocation.proceed(AsyncMethodInvocation. 
java:100)
         at ch.iserver.ace.util.AsyncWorker.doWork(AsyncWorker.java:102)
         at ch.iserver.ace.util.Worker.run(Worker.java:49)


Does anyone know this problem? Is it a bug or do I use the channel the  
wrong way?

Any help highly appreciated.

Lukas



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