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You may use a combination of all three together, annotations without JPA programming interfaces and lifecycle, or even pure native Hibernate Core, depending on the business and technical needs of your project.At all time you can fall back to Hibernate native APIs, or if required, even to native JDBC and SQL.

Download Hibernate Validator 4 or above from the Hibernate website and add We recommend you use the JPA 2 APIs to bootstrap Hibernate (see the Hibernate Entity Manager documentation for more information).

If you use Hibernate Core and its native APIs read on.

If you boot Hibernate yourself, make sure to use the Note that you can mix the legacy use and the annotation approach.

Hibernate, like all other object/relational mapping tools, requires metadata that governs the transformation of data from one representation to the other.

Hibernate Annotations provides annotation-based mapping metadata. The JPA specification recognizes the interest and the success of the transparent object/relational mapping paradigm.

It standardizes the basic APIs and the metadata needed for any object/relational persistence mechanism.offers a complete (and standalone) JPA persistence solution on top of the mature Hibernate Core.If you are moving from previous Hibernate Annotations versions, please have a look at Java Persistence migration guide.This is the JAR containing the JPA 2.0 API, it is fully compliant with the spec and passed the TCK signature test.You typically don't need it when you deploy your application in a Java EE 6 application server (like JBoss AS 6 for example).We recommend you use Hibernate Validator and the Bean Validation specification capabilities as its integration with Java Persistence 2 has been standardized.

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