"http-localhost-8080-19" daemon prio=1 tid=0x0000000043f460f0 nid=0x7d76 in Object.wait() [0x000000004aabd000..0x000000004aabec10]
    at java.lang.Object.wait(Native Method)
    at EDU.oswego.cs.dl.util.concurrent.CondVar.timedwait(CondVar.java:222)
    - locked <0x00002b5feef4a068> (a EDU.oswego.cs.dl.util.concurrent.CondVar)
    at org.jgroups.protocols.FC.handleDownMessage(FC.java:454)
    at org.jgroups.protocols.FC.down(FC.java:374)
    at org.jgroups.stack.Protocol.receiveDownEvent(Protocol.java:499)
    at org.jgroups.protocols.FC.receiveDownEvent(FC.java:368)
    at org.jgroups.stack.Protocol.passDown(Protocol.java:533)
    at org.jgroups.protocols.FRAG2.down(FRAG2.java:167)
    at org.jgroups.stack.Protocol.receiveDownEvent(Protocol.java:499)
    at org.jgroups.stack.Protocol.passDown(Protocol.java:533)
    at org.jgroups.protocols.pbcast.STATE_TRANSFER.down(STATE_TRANSFER.java:294)
    at org.jgroups.stack.Protocol.receiveDownEvent(Protocol.java:499)
    at org.jgroups.stack.ProtocolStack.down(ProtocolStack.java:390)
    at org.jgroups.JChannel.down(JChannel.java:1230)
    at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.down(MessageDispatcher.java:792)
    at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.passDown(MessageDispatcher.java:769)
    at org.jgroups.blocks.RequestCorrelator.sendRequest(RequestCorrelator.java:304)
    at org.jgroups.blocks.GroupRequest.doExecute(GroupRequest.java:444)
    at org.jgroups.blocks.GroupRequest.execute(GroupRequest.java:193)
    at org.jgroups.blocks.MessageDispatcher.castMessage(MessageDispatcher.java:432)
    at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:192)
    at sun.reflect.GeneratedMethodAccessor151.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at org.jboss.cache.TreeCache.callRemoteMethodsViaReflection(TreeCache.java:4484)
    at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:4433)
    at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:4386)
    at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:4504)
    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:119)
    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:5934)
    at org.jboss.cache.TreeCache.put(TreeCache.java:3788)
    at sun.reflect.GeneratedMethodAccessor167.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    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 $Proxy175.put(Unknown Source)
    at org.jboss.web.tomcat.service.session.JBossCacheWrapper.put(JBossCacheWrapper.java:138)
    at org.jboss.web.tomcat.service.session.JBossCacheService.putSession(JBossCacheService.java:325)
    at org.jboss.web.tomcat.service.session.JBossCacheClusteredSession.processSessionRepl(JBossCacheClusteredSession.java:125)
    - locked <0x00002b60227853b8> (a org.jboss.web.tomcat.service.session.SessionBasedClusteredSession)
    at org.jboss.web.tomcat.service.session.JBossCacheManager.processSessionRepl(JBossCacheManager.java:1153)
    at org.jboss.web.tomcat.service.session.JBossCacheManager.storeSession(JBossCacheManager.java:702)
    - locked <0x00002b60227853b8> (a org.jboss.web.tomcat.service.session.SessionBasedClusteredSession)
    ...

The "IncomingPacketHandler (channel=Tomcat-CLUSTER-PROD)" thread is waiting to lock a org.jboss.web.tomcat.service.session.SessionBasedClusteredSession monitor held by an http, https, or ajp connector thread:

"IncomingPacketHandler (channel=Tomcat-CLUSTER-PROD)" daemon prio=1 tid=0x00002aaaad5b6e60 nid=0x73e6 waiting for monitor entry [0x000000004697b000..0x000000004697dc90]
     at org.jboss.web.tomcat.service.session.ClusteredSession.expire(ClusteredSession.java:818)
     - waiting to lock <0x00002b60227853b8> (a org.jboss.web.tomcat.service.session.SessionBasedClusteredSession)
...

JBoss is unresponsive and "java.lang.OutOfMemoryError: Java heap space" appears in the JBoss server.log.