I've pushed [one more commit](https://github.com/gunnarmorling/Resteasy/compare/RESTEASY-854) to my fork. This makes the update to HV 5.0.1.Final and retrieves the constraint violation type as described above.

Most (all?) tests around validation seem to be disabled; I've added one simple test which tests `ViolationsContainer` on its own. I'm also seeing one test failure in the crypto module, but as I get that one as well on master, I think it's unrelated.