Hi Karel, Back from vacation and I just saw this commit: https://github.com/hibernate/hibernate-orm/commit/b3e56a5db71110d07a09576... . As it will break user code, we need a note in the migration guide about this change (migration-guide.adoc at the root of the repository). The migration guide in master ( https://github.com/hibernate/hibernate-orm/blob/master/migration-guide.adoc) is currently empty but you can see some examples in the 5.3 migration guide: https://github.com/hibernate/hibernate-orm/blob/5.3/migration-guide.adoc . Could you take care of it? Thanks! -- Guillaume