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  1. Application Server 3 4 5 and 6
  2. JBAS-3137

ConcurrentModificationException in Tomcat session replication

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Out of Date
    • Affects Version/s: JBossAS-4.0.3 SP1
    • Fix Version/s: JBossAS-4.0.4RC1
    • Labels:
      None
    • Environment:

      JBoss 4.0.3SP1, j2re 1.5.0_06, Linux RHES 4 on dual Opteron 275.
      Configured for load balancing with sticky sessions (mod_jk) and fail over (session replication).

      Description

      Vladyslav Kosulin reported in JBWEB-56:

      I see the fillowing exception few times a day, and it does not look like the cause is in application code:

      java.util.ConcurrentModificationException
      at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
      at java.util.HashMap$EntryIterator.next(Unknown Source)
      at java.util.HashMap$EntryIterator.next(Unknown Source)
      at java.util.HashMap.writeObject(Unknown Source)
      at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
      at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
      at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
      at java.io.ObjectOutputStream.writeObject0(Unknown Source)
      at java.io.ObjectOutputStream.writeObject(Unknown Source)
      at org.jboss.web.tomcat.tc5.session.SessionBasedClusteredSession.writeExternal(SessionBasedClusteredSession.java:288)
      at org.jboss.web.tomcat.tc5.session.JBossCacheService.externalizeSession(JBossCacheService.java:771)
      at org.jboss.web.tomcat.tc5.session.JBossCacheService.putSession(JBossCacheService.java:229)
      at org.jboss.web.tomcat.tc5.session.SessionBasedClusteredSession.processSessionRepl(SessionBasedClusteredSession.java:165
      at org.jboss.web.tomcat.tc5.session.JBossCacheManager.processSessionRepl(JBossCacheManager.java:606)
      at org.jboss.web.tomcat.tc5.session.JBossCacheManager.storeSession(JBossCacheManager.java:375)
      at org.jboss.web.tomcat.tc5.session.InstantSnapshotManager.snapshot(InstantSnapshotManager.java:38)
      at org.jboss.web.tomcat.tc5.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:91)
      at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
      at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:307)
      at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:385)
      at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:748)
      at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:678)
      at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:871)
      at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
      at java.lang.Thread.run(Unknown Source)

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              • Assignee:
                brian.stansberry Brian Stansberry
                Reporter:
                brian.stansberry Brian Stansberry
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                Dates

                • Created:
                  Updated:
                  Resolved: