Yes, we unfortunately know about this - Dali massively changed their API's (again) meaning you can't have one plugin that works on both Eclipse 3.7 and 3.8/4.0.
We've not constrained the version install since then large part of jboss tools could not get installed at all.
This should *only* affect if using Hibernate provider - for now on juno you shold fallback to Generic.
https://issues.jboss.org/browse/JBIDE-11469 has the gory details. sorry for the inconvenince ;(