Hello All,

my company uses Hibernate as persistence-layer when suddenly our customer requested 100% JPA compliance.

My question is now: What features of Hibernate are not covered by the JPA?

In the Hibernate API I found a list of all Annotations that are extended by Hibernate, but I wasn't able to find something else.

I am especially interested in differences between JPQL and HQL and if there are other areas where Hibernate extends the functionality of JPA.

Every link or hint would be helpful.

Yours Sincerely.
Thilo

As long as you stick to the javax.persistence annotations, and avoid using the special Hibernate annotations like GenericGenerator and Type, you are JPA compliant as far as I can see.

You should read the spec and especially the chapter about JPA-QL, this is where you might be bitten. The rest is trivial as toverlier said.

Note that you have the moral obligation to tell your customers they are making the wrong decision. Using specific features of your provider is perfectly OK as long as you understand it. It will be much cheaper to implement a workaround down the road if you switch to a different provider rather than applying a dogmatic strict compliance rule. For example it means you will not be able to use second level caches. This rule applies regardless of the provider you chose (Hibernate or one of it's competitors)