G'day, I finally got my client and server talking on the same MessageBus, but I discovered that my message parts were coming through (server->client) as null. This was a silent failure - what happened to the "glorious runtime exception"?. Anyway, I eventually found the post on errai-dev about @ExposeEntity, and the new section in the documentation. http://www.errai-framework.org/docs/html/en/#d0e362 The documentation says that classes annotated with @ExposeEntity will have stubs generated for them, but this doesn't seem to be happening. (NB: The docs & example should mention the need for Serializable; my objects were originally designed for GWT-RPC, and implemented IsSerializable.) I've annotated both the concrete classes and the interface they implement, but it doesn't look like the stub generator is even being called. If it were, I think I would see the INFO logging in the JBoss console at startup. Is there something else I need to do for these stubs to be generated? Do the stubs even work on the server, or are they client-side only? Tracing the code, it seems like the ServerMessageBus calls JSONEncoder, and I can't see where the stubs could come into it, even if they were generated. (But perhaps I just don't understand the code well enough.) JSONEncoder seems to be fairly happy as long as my objects implement Serializable *and* provide getter methods for everything, but it doesn't seem to handle Enums... Hmm. I don't suppose anyone knows a way I can just ask GWT-RPC to serialize my objects its way, and then just stick the result into a message part? Regards Sean. -- Sean Flanigan Senior Software Engineer Engineering - Internationalisation Red Hat