[jboss-user] [Clustering] - Re: Failure when cleaning up HTTP Session in JBoss AS Cluste

RichardTaylor do-not-reply at jboss.com
Wed Oct 21 19:08:52 EDT 2009

After looking closer at the logs, the exceptions were being logged every 10 seconds, not in a tight loop like I had originally thought.   It felt like a tight loop while watching two production servers throw new errors ;)

So it appears that it was a single session that got corrupted and the ContainerBackgroundProcessor was trying to clean up the same bad session on 2 of the 3 servers in the cluster.  It's unclear how the third did not get caught up in the problem as well.

Finding something invalid that is put into our sessions is a bit of a needle in a haystack, it's a fairly large app.  We've been doing session replication (with failover / deserialization of replicated sessions) working well for several month.  It's just when we turned on passivation that this error occurs.  

I would think that if a session were serialized ok/without errors (granted errors might be happening and not caught on serialization), that it could be deserialized ok.  To me this implies that it was corrupted / changed while in its serialized form.

Is it possible that using the org.jboss.cache.loader.FileCacheLoader could cause such corruption of a session?  The docs do mention using caution with this in high load environments.  I'm currently working on testing the JDBC based loader for passivation.

Thanks for writing up those two jira issues, those directly describe what we ran into. 

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