[jboss-user] [Clustering/JBoss] - Re: Session Replication - Concurrency Problems?
Hi,
I'm seeing similar issue.
"bstansberry(a)jboss.com" wrote :
| Everyone else -- is anyone seeing this problem with sticky sessions enabled and
working properly? You have to use sticky sessions.
Why does sticky session need to enabled? We have sticky session false and want to
replicate the session.
We see this error when we repeatedly log in and out using the same browser.
I did printDetail on JMS console TomcatClusteringCache
When I log in, I see the following in both nodes.
/JSESSION
|
| /localhost
|
| /myapp
|
| /s6YGpkbACWfDPVre4sMcqQ**
| VERSION: 3
| s6YGpkbACWfDPVre4sMcqQ**: [B@5e43ee
After logging out, I see the same in both nodes, except that the VERSION is bumped up to
4.
I tried logging in and out repeatedly, until I run into the error.
ERROR [org.jboss.web.tomcat.tc5.session.JBossCacheService] externalizeSession(): exception
occurred externalizing session SessionBasedClusteredSession[id:
s6YGpkbACWfDPVre4sMcqQ**.worker1 lastAccessedTime: 1184115870097 version: 13 lastOutdated:
0]
| java.lang.NullPointerException
| at
org.springframework.webflow.execution.FlowSessionImpl.writeObject(FlowSessionImpl.java:156)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| ...
Followed by
WARN [org.jboss.web.tomcat.tc5.session.CacheListener] Possible concurrency problem:
Replicated version id 13 matches in-memory version for session s6YGpkbACWfDPVre4sMcqQ**
Here is tc5-cluster jboss-service.xml settings
| <attribute
name="ClusterName">Tomcat-${jboss.partition.name:Cluster}</attribute>
| <attribute name="IsolationLevel">REPEATABLE_READ</attribute>
| <attribute name="CacheMode">REPL_ASYNC</attribute>
|
Any idea?
Thanks in advance,
Jennifer
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