I am wondering how this should happen. GWT uses a cache Map<String, SerializationPolicy> with the key being the permutation strong name. So if an outdated client makes a request and no serialization policy is found, a default policy will be put into that cache for the outdated permutation strong name. Once the client reloads the app and has the new JS code the permutation strong name should be a different/new one and thus the cache does not hit which in turn means the correct policy will be loaded and put into the cache.--
I can't think of a way in which the permutation strong name stays the same but the RPC policy file has changed.
Here is what I do to deal with outdated clients using GWT-RPC: https://groups.google.com/forum/#!msg/google-web-toolkit/wy-agrYSHsk/DgZr4zR0iKMJ
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