Originally posted by John Todd: As JPA is copied from Hibernate mainly, why they didn't include every thing? For example, why they didn't include delete-orphan cascade type? Any technical issues?
There are 3 parts to the answer:
1. Because JPA is NOT copied from Hibernate, Hibernate just happens to be one of 5 major implementations 2. Because we didn't (and still don't) believe that the Hibernate way of doing it is necessarily the best way 3. Because we didn't have enough time to put in every single feature that every ORM vendor provided