I too use the new GWT Plugin, not the deprecated Google one.--
I had to downgrade Eclipse to be able to work and don't remember the exact complete stack trace, but the top was certainly something like
JavaProject. computePackageFragmentRoots([ Lorg/eclipse/jdt/core/ IClasspathEntry;ZLjava/util/ Map;)[Lorg/eclipse/jdt/core/ IPackageFragmentRoot;
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