Re: [Beepcore-java-users] TCPSession.sendFrame: NullPointerException
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From: Pete S. <si...@uc...> - 2005-12-05 17:43:21
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I haven't seen much traffic on this list since I joined. It's good to see some. I found a bug in Java BEEP and reported it to the buglist at the BEEP SourceForge site. I just wonder - is that the right thing to do, or are other users using this list to talk about bugs? -- Pete Wladimir Araujo wrote: > I've run into this a couple of times. TCPSession has some race > conditions re the socket manipulation. What I do to avoid these problems > (all but one) is to guarantee that the channel and session cannot be > closed while sending messages (through external locks). Of course, if > the session is closed from the other side there is nothing we can do. In > this case, the NullPointerException kills the TCPSEssion thread (created > inside enableIO()). > > Fixing these problems is not trivial (chance of distributed deadlock), > so I decided it was easier to live with them ;-) > > Wladimir > -----Original Message----- > From: bee...@li... > [mailto:bee...@li...] On Behalf Of > Lukas Zbinden > Sent: Monday, December 05, 2005 6:21 AM > To: bee...@li... > Subject: [Beepcore-java-users] 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 > > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log > files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click > _______________________________________________ > Beepcore-java-users mailing list > Bee...@li... > https://lists.sourceforge.net/lists/listinfo/beepcore-java-users > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > http://ads.osdn.com/?ad_idv37&alloc_id865&op=click > _______________________________________________ > Beepcore-java-users mailing list > Bee...@li... > https://lists.sourceforge.net/lists/listinfo/beepcore-java-users > |