The core issue here is to figure out the cause of the 
java.io.OptionalDataException. What's being deserialized here is a value object 
your application is putting into the session via setAttribute().

The handling of this by the AS could certainly be better.

1) When the deserialization failure occurs, it's being handled in a poor manner:

https://jira.jboss.org/jira/browse/JBCLUSTER-243

2) The background processing logic shouldn't keep trying to work with the 
session cleanly for ever; it should detect a session with a recurring problem 
and just hard delete it:

https://jira.jboss.org/jira/browse/JBAS-7397

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