Re: RPC Service returns null in client, but not in service.

Well then you probably have to debug. From what I can tell if I receive NULL on the client then I have send NULL on the server. I have never seen "disappearing" data if serializable classes are implemented correctly in terms auf GWT-RPC requirements. To see RPC payloads on the console you can use the JVM parameter -Dgwt.rpc.dumpPayload=true

A good documentation about GWT-RPC's wire format can be found at https://plus.google.com/114156500057804356924/posts/7JLYQ61dW14 

This helps quite a lot to understand the payload. 

-- J.

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