You should have a look on this:
http://googlewebtoolkit.blogspot.com/2010_08_01_archive.html
GWT/Maven integration is a bit tricky, but when strictly applying the
procedure detailed in the blog, it works like a charm.
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I found a workaround by disabling and reenabling Maven dependency injection
in Eclipse:
Right-click on the project Maven Disable Dependency Management
Right-click on the project Maven Enable Dependency Management
I still think there may be something wrong with the GEP though...
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You