Hibernate 4.3.0.Final (Dec. 16, 2013) is the first production ready release to support jpa 2.1.
See: http://in.relation.to/Bloggers/HibernateORM430FinalRelease
The main focus of 4.3 was JPA 2.1 support, so much of the work these
past few months focused on new JPA 2.1 features.