Hello everyone, we're currently experiencing a problem when trying to replicate sessions via UDP multicast (it works just fine over TCP). We're currently using JBoss 4.2.3.GA

This cluster has only two machines: If you log in on machine A, the session should be automatically replicated to server B. The problem occurs when you access the site on any of the two servers.

On the server getting "accessed" i'm getting:

22:05:01,684 WARN  [/test] Failed to replicate session 3Q2eCDboj1FVZSgfk-ri1w**.node-10-204-238-6

java.lang.RuntimeException: JBossCacheService: exception occurred in cache put ...

at org.jboss.web.tomcat.service.session.JBossCacheWrapper.put(JBossCacheWrapper.java:147)

at org.jboss.web.tomcat.service.session.JBossCacheService.putSession(JBossCacheService.java:325)

at org.jboss.web.tomcat.service.session.JBossCacheClusteredSession.processSessionRepl(JBossCacheClusteredSession.java:123)

at org.jboss.web.tomcat.service.session.JBossCacheManager.processSessionRepl(JBossCacheManager.java:1127)

at org.jboss.web.tomcat.service.session.JBossCacheManager.storeSession(JBossCacheManager.java:682)

at org.jboss.web.tomcat.service.session.InstantSnapshotManager.snapshot(InstantSnapshotManager.java:49)

at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:108)

at org.jboss.web.tomcat.service.session.JvmRouteValve.invoke(JvmRouteValve.java:84)

at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)

at java.lang.Thread.run(Thread.java:619)

Caused by: org.jboss.cache.ReplicationException: rsp=sender=172.31.1.1:56138, retval=null, received=false, suspected=false

at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:4449)

at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:4371)

at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:4489)

at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpcInterceptor.java:110)

at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpcInterceptor.java:88)

at org.jboss.cache.interceptors.ReplicationInterceptor.handleReplicatedMethod(ReplicationInterceptor.java:124)

at org.jboss.cache.interceptors.ReplicationInterceptor.invoke(ReplicationInterceptor.java:88)

at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)

at org.jboss.cache.interceptors.TxInterceptor.handleNonTxMethod(TxInterceptor.java:379)

at org.jboss.cache.interceptors.TxInterceptor.invoke(TxInterceptor.java:174)

at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)

at org.jboss.cache.interceptors.CacheMgmtInterceptor.invoke(CacheMgmtInterceptor.java:167)

at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:5919)

at org.jboss.cache.TreeCache.put(TreeCache.java:3784)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)

at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)

at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)

at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)

at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)

at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)

at $Proxy104.put(Unknown Source)

at org.jboss.web.tomcat.service.session.JBossCacheWrapper.put(JBossCacheWrapper.java:138)

... 17 more

Caused by: org.jboss.cache.lock.TimeoutException: Response timed out: sender=172.31.1.1:56138, retval=null, received=false, suspected=false

at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:4447)

... 42 more

And on the other node i'm getting:

22:05:01,810 ERROR [UDP] failed unmarshalling message

java.io.EOFException

at java.io.DataInputStream.readShort(DataInputStream.java:298)

at org.jgroups.Message.readFrom(Message.java:630)

at org.jgroups.protocols.TP.bufferToList(TP.java:1025)

at org.jgroups.protocols.TP.handleIncomingPacket(TP.java:828)

at org.jgroups.protocols.TP.access$400(TP.java:46)

at org.jgroups.protocols.TP$IncomingPacketHandler.run(TP.java:1297)

at java.lang.Thread.run(Thread.java:619)