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Understanding EclipseLink, 2.4
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Entities and Persistent Identity

Every entity must have a persistent identity, which is an equivalent of a primary key in a database table that stores the entity state.

By default, the EclipseLink persistence provider assumes that each entity has at least one field or property that serves as a primary key.

You can generate and/or configure the identity of your entities by using the following annotations:

You can also use these annotations to fine-tune how your database maintains the identity of your entities. For more information on these annotations, see "Metadata for Object/Relational Mapping" in the JPA Specification.

http://jcp.org/en/jsr/detail?id=317

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