I am running JBOSS 3.2.3 on Windows 2000.  Session Level failover works
fine for me as long as I don't have a large number of items in the
session. Once the number of items in session reaches a certain size (I
don't know the majic number) I get the following error. Can anyone give
me any information on what might be happening and how to fix it? 

Here is the Exception 


12:42:31,666 WARN [InstantSnapshotManager] Failed to replicate
sessionID:6nQzmX 
01GSraKQRIgK2QTg** 
javax.ejb.EJBException: Exception in setHttpSession:
javax.ejb.EJBException: Exc 
eption in setHttpSession: RuntimeMBeanException: RuntimeException in
MBean opera 
tion 'invoke(org.jboss.invocation.Invocation)' 
Cause: javax.ejb.EJBException:
java.util.ConcurrentModificationException 
at
org.jboss.ha.httpsession.server.ClusteredHTTPSessionService.setHttpSe 
ssion(ClusteredHTTPSessionService.java:117) 
at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source) 
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces 
sorImpl.java:25) 
at java.lang.reflect.Method.invoke(Method.java:324) 
at
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBea 
nDispatcher.java:284) 
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)

at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177) 
at $Proxy41.setHttpSession(Unknown Source) 
at
org.jboss.web.tomcat.session.ClusterManager.storeSession(ClusterManag 
er.java:615) 
at
org.jboss.web.tomcat.session.InstantSnapshotManager.snapshot(InstantS 
napshotManager.java:39) 
at
org.jboss.web.tomcat.session.ClusteredSessionValve.invoke(ClusteredSe 
ssionValve.java:89) 
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex 
t.invokeNext(StandardPipeline.java:641) 
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav 
a:480) 
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) 

at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java: 
2417) 
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j 
ava:180) 
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex 
t.invokeNext(StandardPipeline.java:643) 
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche 
rValve.java:171) 
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex 
t.invokeNext(StandardPipeline.java:641) 
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j 
ava:172) 
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex 
t.invokeNext(StandardPipeline.java:641) 
at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit 
yAssociationValve.java:65) 
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex 
t.invokeNext(StandardPipeline.java:641) 
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java: 
577) 
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex 
t.invokeNext(StandardPipeline.java:641) 
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav 
a:480) 
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) 

at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal 
ve.java:174) 
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex 
t.invokeNext(StandardPipeline.java:643) 
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav 
a:480) 
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) 

at
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcesso 
r.java:1040) 
at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.ja 
va:1151) 
at java.lang.Thread.run(Thread.java:534)

Any help is appreciated,
Rich


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