http://in.relation.to/Bloggers/HibernateORM421FinalAnd4112FinalReleased Originally, 4.1.11 was slated to be the final release of 4.1.x. However, in HHH-8149, we reverted HHH-7797 for 4.1 (changed unique columns, keys, and constraints). The change had snowballed into numerous issues and, in hindsight, shouldn't have been made in 4.1.x to begin with. To clean things up, it was decided to release 4.1.12. Thank you for all your contributions! Brett Meyer Red Hat Software Engineer, Hibernate