Focus on AS trunk (i.e. 5.x). For now I want to very much restrict new feature development in Branch_4_2. Branch_4_0 is definitely bug-fix only. Suggest you start with a post on the JBoss Serialization forum to check the status of support for serializing non-Serializable classes; i.e. how stable, is it being actively maintained or developed, etc. From what I understand, in the more recent JDK 5 releases, standard JDK serialization has fixed the stuff that had made JBoss Serialization more performant. So, one reason for ongoing work on JBoss Serialization is gone. Before introducing a feature to JBoss AS that depends on a JBoss Serialization feature, I want to be sure that the JBS feature is stable for the long term. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4062094#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...