When using SuperDevMode your server side code must access the GWT-RPC serialization policy files from your SDM code server (because thats the one compiling your app and generating the up-to-date policy file).
This was kind of annoying with previous GWT versions but now GWT is able to download these files from the code server automatically if you set the system property gwt.codeserver.port for your server. As you seem to use classic DevMode as jetty server you must launch classic DevMode with -Dgwt.codeserver.port=<your SDM code server port>
If for whatever reasons your SDM code server is not listening on localhost you have to override RemoteServiceServlet.getCodeServerPolicyUrl(). Also take a look at the JavaDoc of that method.
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