[jboss-user] [JBossCache] - ConcurrentModificationException when serializing session in

archerzz do-not-reply at jboss.com
Tue Nov 13 22:54:10 EST 2007 

Hi all, recently I found that "ConcurrentModificationException" happened a few times in the server log. I know that JBoss 4.0.3sp1 has a bug:http://jira.jboss.com/jira/browse/JBAS-3137 on that. It's said that this problem is fixed. But now I met this again. Please see below. Also I found that before and after this exception happened, there were warning message "[org.jboss.resource.connectionmanager.CachedConnectionManager] Closing a connection for you.  Please close them yourself:" around it.
My configuration: JBoss 4.2.1GA + JDK 1.5.0_13. Any suggestion is appreciated. Thanks!
2007-11-13 08:22:57,418 ERROR [org.jboss.web.tomcat.service.session.JBossCacheService] externalizeSession(): exception occurred externalizing session SessionBasedClusteredSession[id: QyohhhjQAARi2HkAreBYvg**.server1 lastAccessedTime: 1194942177369 version: 765 lastOutdated: 0]
  | java.util.ConcurrentModificationException
  | 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
  | 	at java.util.HashMap$EntryIterator.next(HashMap.java:883)
  | 	at java.util.HashMap$EntryIterator.next(HashMap.java:881)
  | 	at java.util.HashMap.writeObject(HashMap.java:1037)
  | 	at sun.reflect.GeneratedMethodAccessor183.invoke(Unknown Source)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  | 	at java.lang.reflect.Method.invoke(Method.java:585)
  | 	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:917)
  | 	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1339)
  | 	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
  | 	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
  | 	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
  | 	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
  | 	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
  | 	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
  | 	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
  | 	at java.util.concurrent.ConcurrentHashMap.writeObject(ConcurrentHashMap.java:1380)
  | 	at sun.reflect.GeneratedMethodAccessor191.invoke(Unknown Source)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  | 	at java.lang.reflect.Method.invoke(Method.java:585)
  | 	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:917)
  | 	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1339)
  | 	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
  | 	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
  | 	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
  | 	at org.jboss.web.tomcat.service.session.SessionBasedClusteredSession.writeExternal(SessionBasedClusteredSession.java:175)
  | 	at org.jboss.web.tomcat.service.session.JBossCacheService.externalizeSession(JBossCacheService.java:1027)
  | 	at org.jboss.web.tomcat.service.session.JBossCacheService.putSession(JBossCacheService.java:316)
  | 	at org.jboss.web.tomcat.service.session.JBossCacheClusteredSession.processSessionRepl(JBossCacheClusteredSession.java:121)
  | 	at org.jboss.web.tomcat.service.session.JBossCacheManager.processSessionRepl(JBossCacheManager.java:1097)
  | 	at org.jboss.web.tomcat.service.session.JBossCacheManager.storeSession(JBossCacheManager.java:652)
  | 	at org.jboss.web.tomcat.service.session.InstantSnapshotManager.snapshot(InstantSnapshotManager.java:49)
  | 	at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:98)
  | 	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:128)
  | 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
  | 	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:241)
  | 	at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:437)
  | 	at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:381)
  | 	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
  | 	at java.lang.Thread.run(Thread.java:595)
  | 2007-11-13 08:22:57,421 INFO  [org.jboss.resource.connectionmanager.CachedConnectionManager] Closing a connection for you.  Please close them yourself: org.jboss.resource.adapter.jdbc.WrappedConnection at 701eae
  | java.lang.Throwable: STACKTRACE
  | 	at org.jboss.resource.connectionmanager.CachedConnectionManager.registerConnection(CachedConnectionManager.java:290)
  | 	at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:417)
  | 	at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:842)
  | 	at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:88)
  | 	at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:112)
  | 	at com.nsite.processserver.ConnectionManager.getConnection(ConnectionManager.java:174)
  | 	at org.apache.jsp.c.rulesdesigner.DecisionTableBuilder_jsp._jspService(DecisionTableBuilder_jsp.java:133)
  | 	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
  | 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  | 	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387)
  | 	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
  | 	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
  | 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at com.nsite.filter.URLProcessorFilter.doFilter(URLProcessorFilter.java:39)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at com.nsite.filter.GZIPFilter.doFilter(GZIPFilter.java:23)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at com.nsite.config.RequestContextManager.doFilter(RequestContextManager.java:31)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
  | 	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
  | 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
  | 	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
  | 	at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:87)
  | 	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:128)
  | 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
  | 	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:241)
  | 	at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:437)
  | 	at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:381)
  | 	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
  | 	at java.lang.Thread.run(Thread.java:595)

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