Yeah, I dunno what's going there with you… but it's seriously messed up. Ah well, keeps you on the edge 
It would be broken with the * imports if that stuff DF moved to jmex like GameStateManager and StandardGame was also still in app… thus the ambiguity error. You might double check your source.
Still, we generally tend away from .* imports in jme code to avoid accidents like this, so no harm no foul eitherway.
Ah, very smart…
I assumed that quixote_arg already took care of that rogue file, but still my statement wasn't true 