Also if you are using an external server for GWT during development make sure that you first start dev mode and access your app. Then, when you got a SerializationException, redeploy your app to your external server and try it again. This ensures that your server always has the up-to-date version of the serialization policy file.
When I encounter SerializationExceptions I mostly forgot to add a default constructor to my classes. So check this first! ;-)
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