It would seem to me that I can have the same cross domain marshalling problem in JBC itself as well though. If I have two applications sharing a cache across web apps in the same server, with different class loading domains for the shared data, it would have to be marshalled/unmarshalled in each web apps class loader space. In general marshalling/unmarshalling is going to need the ability to establish a class loader. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4169198#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...