Re: GWT + EJB + MYSQL

If you use GWT-RPC every class that goes over the wire has to implement Serializable and must have a default constructor. Depending on your setup it can occur that the RemoteServiceServlet from GWT does not find the serialization policy file. So you should check your server logs to see if there are any serialization warnings.

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! ;-)

-- J.

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