As previously discussed, Hibernate applications need access to the
Javassist runtime classes (see example [1] enhanced application entity
if you didn't know this :).  A proposal was discussed on the
hibernate-dev mailing list that I think is the best short term solution.
  I wanted to raise this issue here also, as I would like to later
create a pull request to bring in a new Hibernate ORM that includes this
change.  So, getting early feedback before we create JIRAs for the work,
is important.

The proposal is to private package (or shade), the Javassist classes, so
that Hibernate ORM has its own copy of the Javassist classes.  On
WildFly, we still would include Javassist for the other components that
use it and for Hibernate applications that have "build-time enhanced
entity classes" by an earlier Hibernate release.

One downside of this change is that Hibernate applications cannot easily
switch to a different version of the Javassist classes.

Another downside is that applications that depend on an older Hibernate
ORM version that includes "build-time enhanced entity classes", will
need to be cracked open, to add dependencies on the Javassist module
(since we will stop automatically adding Javassist to JPA application
deployments).

The advantage of this change, is that Hibernate applications can include
their own version of Javassist.

This will also have an impact on Hibernate build-time enhancing of
entity classes (e.g. enhanced bytecode will no longer depend on the
public Javassist classes).

Scott

[1] https://gist.github.com/scottmarlow/dc7ebfea654984f84e2e
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