for any attribute to be replicated, it must implement serializable. Regardless of the session replication policy in effect. JBossSerialization implmentation is meant to be used instead of Java Serialization for replication and not meant to deal with non-serializable attributes. It's possible to use JBoss Serialization to serialize non-serializable before replicating them but that require further developement and it was beyond the scope of JBAS-2921. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4061937#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...