What is the minimum requirement of files/settings to get JPA Buddy to work

I have an existing project that I'd like to add hibernate to and use JPA Buddy to reverse engineer the db. I've been able to connect and view the db in the db tool, but any time i try to reverse engineer or even add a persistence unit the ui silently fails with no notice. I've tried adding facets for jpa and hibernate, i've tried manually creating hibernate.cfg and persistence.xml in the proper folder, nothing seems to work