Manik, If you exclude classes outside of org.jboss.cache, aren't you taking the risk that a 3rd party library could kill backwards compatibility? That's why we should default to greedy comparisons, like we do on AS, and only remove packages by exception when we determine they are not serialized or don't otherwise present compatibility issues. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3992873#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...