As far as I know you need only one GWT maven module that builds the app.
The rest modules are just regular (platform independent) modules
(<packaging>jar</packaging>) and the gwt-app module depends on it.
So for the client app u have 2: main GWT module (A) with GWT specific code and
GWT dependencies and a plain jar module (B) with shared (with server) logic.
And the A depends on B.
And not forget to add java sources to packaging to module B, otherwise GWT will
not be able to compile it:
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