I checked Drools 5.2.0.M1.x sources yesterday in order to look with more insight to Guvnor internals.

I built the whole project with Maven and that was ok.

But when I tried to run Guvnor with Maven (mvn gwt:run) I was surprised to see that the Maven config do not allow that, I get a lot of errors !

Thankfully I fixed that (after a hard night) and I want to contribute with that Maven config fix.

Are you interested ?

By the way, I've already been Maven maintainer of an open source project on sourceforge, Gilead. And I can help you in the future for anything related to Maven.