jboss cache 报错，求助

[andylyc]

生产环境下的应用这2天不太稳定，过段时间就报以下错误，导致用户端无法正常使用(反应迟缓)，请各位大侠帮忙分析，谢谢。
我们的应用环境：
JBOSS EAP 4.3.0.GA_CP09 双机集群
JBOSS CACHE 版本1.4.1.SP9

报错信息：
2012-06-15 08:28:01,931 WARN [TreeCache] node /JSESSION/localhost/workplace/EmOvoyhH7kkSfvghAVyXaw** not found
2012-06-15 08:28:01,790 WARN [UDP] IncomingPacketHandler thread was interrupted, but is still alive
2012-06-15 08:28:01,789 WARN [TreeCache] replication failure with method_call _put; id:1; Args: ( arg[0] = null ...) exception
org.jboss.cache.lock.TimeoutException: failure acquiring lock: fqn=/JSESSION/localhost/workplace/m51cxrJptF8YBX1CUqALiA**, caller=Thread[IncomingPacketHandler (channel=Tomcat-mes_ui_cluster),5,JGroups threads], lock=<unlocked> (activeReaders=0, activeWriter=null, waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
at org.jboss.cache.Node.acquire(Node.java:533)
at org.jboss.cache.interceptors.PessimisticLockInterceptor.acquireNodeLock(PessimisticLockInterceptor.java:410)
at org.jboss.cache.interceptors.PessimisticLockInterceptor.lock(PessimisticLockInterceptor.java:322)
at org.jboss.cache.interceptors.PessimisticLockInterceptor.invoke(PessimisticLockInterceptor.java:189)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
at org.jboss.cache.interceptors.UnlockInterceptor.invoke(UnlockInterceptor.java:32)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
at org.jboss.cache.interceptors.ReplicationInterceptor.invoke(ReplicationInterceptor.java:39)
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._replicate(TreeCache.java:5196)
at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jgroups.blocks.MethodCall.invoke(MethodCall.java:330)
at org.jgroups.blocks.RpcDispatcher.handle(RpcDispatcher.java:281)
at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:654)
at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:544)
at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:367)
at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:779)
at org.jgroups.JChannel.up(JChannel.java:1090)
at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:382)
at org.jgroups.stack.ProtocolStack.receiveUpEvent(ProtocolStack.java:398)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:158)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.FRAG2.up(FRAG2.java:197)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.FC.up(FC.java:422)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.pbcast.GMS.up(GMS.java:768)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.protocols.pbcast.GMS.receiveUpEvent(GMS.java:788)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:262)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.UNICAST.up(UNICAST.java:259)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.pbcast.NAKACK.handleMessage(NAKACK.java:685)
at org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:517)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:170)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.FD.up(FD.java:300)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:301)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.MERGE2.up(MERGE2.java:162)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.Discovery.up(Discovery.java:225)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:470)
at org.jgroups.stack.Protocol.passUp(Protocol.java:520)
at org.jgroups.protocols.TP.handleIncomingMessage(TP.java:912)
at org.jgroups.protocols.TP.handleIncomingPacket(TP.java:854)
at org.jgroups.protocols.TP.access$400(TP.java:47)
at org.jgroups.protocols.TP$IncomingPacketHandler.run(TP.java:1300)
at java.lang.Thread.run(Thread.java:595)
Caused by: org.jboss.cache.lock.TimeoutException: write lock for /JSESSION/localhost/workplace/m51cxrJptF8YBX1CUqALiA** could not be acquired after 15000 ms. Locks: Read lock owners: [GlobalTransaction:<172.16.1.25:49299>:1151]
Write lock owner: null
(caller=Thread[IncomingPacketHandler (channel=Tomcat-mes_ui_cluster),5,JGroups threads], lock info: <unlocked> (activeReaders=0, activeWriter=null, waitingReaders=0, waitingWriters=0, waitingUpgrader=0))
at org.jboss.cache.lock.IdentityLock.acquireWriteLock(IdentityLock.java:206)
at org.jboss.cache.Node.acquireWriteLock(Node.java:562)
at org.jboss.cache.Node.acquire(Node.java:509)
... 70 more