When I upgraded from 4.0.4GA to 4.0.5GA I started to get problems with

19:50:35,960 ERROR [SimpleStatefulCache] problem passivation thread
javax.ejb.EJBException: Could not passivate; failed to save state
at org.jboss.ejb3.cache.simple.StatefulSessionFilePersistenceManager.passivateSession(StatefulSessionFilePersist
enceManager.java:363)
at org.jboss.ejb3.cache.simple.SimpleStatefulCache.passivate(SimpleStatefulCache.java:196)
at org.jboss.ejb3.cache.simple.SimpleStatefulCache$SessionTimeoutTask.run(SimpleStatefulCache.java:129)
Caused by: java.io.IOException ....
Caused by: java.lang.NoClassDefFoundError: org/jaxen/VariableContext


I do not have any clustering turned on and should not have any caching but I still get this problem. The class org/jaxen/VariableContext is in the jar jaxen.jar in jboss_home/server/default/lib so why can Jboss not find his class and why is it needed.

Any help is very much appreciated!

/Fredrik