Hi,
We work on Tomcat clustered server (5.5) and we have this exception in the log
(at 5-10 TPS).
Could you explain us what's hapenning. Have you a solution? Thanks.
Exception:
------------
SEVERE: Failed to serialize the session!
java.util.ConcurrentModificationException
at
org.apache.commons.collections.SequencedHashMap$OrderedIterator.next(SequencedHashMap.java:757)
at org.apache.commons.collections.LRUMap.writeExternal(LRUMap.java:174)
at
java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1310)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1288)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
at
org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1478)
at
org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:948)
at
org.apache.catalina.cluster.session.ReplicatedSession.writeObjectData(ReplicatedSession.java:189)
at
org.apache.catalina.cluster.session.SimpleTcpReplicationManager.writeSession(SimpleTcpReplicationM
anager.java:353)
at
org.apache.catalina.cluster.session.SimpleTcpReplicationManager.requestCompleted(SimpleTcpReplicat
ionManager.java:317)
at
org.apache.catalina.cluster.tcp.ReplicationValve.send(ReplicationValve.java:549)
at
org.apache.catalina.cluster.tcp.ReplicationValve.sendMessage(ReplicationValve.java:536)
at
org.apache.catalina.cluster.tcp.ReplicationValve.sendSessionReplicationMessage(ReplicationValve.ja
va:518)
at
org.apache.catalina.cluster.tcp.ReplicationValve.sendReplicationMessage(ReplicationValve.java:428)
at
org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationValve.java:362)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)
Env:
Tomcat Version 5.5.25
Platform
OS Linux xxx 2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:56:44 EST 2007 x86_64 x86_64
x86_64 GNU/Linux
JVM :
java version "1.5.0_12"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04)
BEA JRockit(R) (build R27.4.0-90-89592-1.5.0_12-20070928-1715-linux-x86_64,
compiled mode)
Web Server Apache 2.0.59 and mod_jk-1.2.25
Apache jk/worker conf:
----------------------
worker.list=balancer
worker.balancer.type=lb
worker.balancer.balance_workers=asur,asmar
worker.balancer.sticky_session=1
worker.asur.host=xxxxxxxxx
worker.asur.port=8009
worker.asur.type=ajp13
worker.asur.lbfactor=1
worker.asur.activation=disabled
worker.asmar.host=xxxxxxx
worker.asmar.port=8009
worker.asmar.type=ajp13
worker.asmar.lbfactor=1
worker.asmar.redirect=asur
Cluster configuration:
----------------------
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