That's pretty much what the AS's HAPartition does. There it's a bit less klugey because there's no general purpose CacheMarshaller equivalent that might get passed something other than an equivalent to your RegionalisedReturnValue. As we were chatting, ensuring that the RPC/state transfer/CacheLoader uses of marshalling invoke different marshaller methods can reduce the klugeyness. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4140242#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...