Hi Giovanni Lovato,
I'm not sure of the details but I see several failures on the CI of this PR:

• https://github.com/wildfly/wildfly/pull/8961
  It's possible that some (all?) of these are trivial to fix, as it seems like the PR was sent as an experiment, but it's for sure going to take a bit longer and possibly need releases from other projects integrating with it.

The main reason for which WildFly will not yet upgrade from ORM 5.0 to 5.2 is that a single method on the API changed in a non backwards compatible way, which is a strict no-go in WildFly, while in the ORM team we considered this single change to be a reasonable tradeoff.

For the record the API change is that org.hibernate.Session#getFlushMode had to change the return type, as Session now also implements EntityManager and unfortunately this has a method with the same name. We couldn't adjust the return type as it's an enum.

WildFly's team is now considering an upgrade to ORM 5.1.x