Entity state and entity id value in JPA/Hibernate after rollback

Question

What happens with Entities in session if I make rollback ? Do they get back to the state before transaction ? In particular do they get new ids ?

Example:

Answer 1

All managed entites will become detached.

Unless you are using an extended persistence context, rolling back also ends the persistence context.

(see OpenJPA docs: http://openjpa.apache.org/documentation.html)