To facilitate re-using some Cool Stuff (tm) between the web and the IDE - I have moved common classes into drools-compiler (about 2 dozen and change). They are all in the org.drools.brms package in drools-compiler (and unit tests to match) in case we want to move them again. I also change drools-jbrms to, obviously, remove the stuff that is now in compiler. I also had to do a few tricks for the GWT launcher and compiler, so it knows where to find source that the GUI needs, but thats all good. So, you WILL need to: cd drools-compiler mvn install (to update the deps that jbrms needs) cd drools-jbrms mvn package Any problems, hassle me.