You can't unless you do a proper removeOjbect first. E.g., before sending it out thru the wire, you will need: v = cache.removeObject(fqn); Otherwise, it is a proxy that not serializable because it contains local data only. Or another option is cloning it first before sending it, and then do a putObject if you decide to put it back to the cache. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4002719#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...