Any drawbacks of using Hibernate EntityManager (vs. Hibernate Core)?

If JPA 2.0 supports what you need, there is in my opinion no advantage at using Hibernate Core directly (and with JPA 2.0, the gap became more thin, making the need to fallback to Core the exception, not the rule, which is a very good thing).

It has been clear: depending on the business and technical needs of your project.

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