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EclipseLink/UserGuide/JPA/Basic JPA Development/Entities/Ids/Generating and Configuring Entity Identities

Entity

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:

  • @Id
  • @IdClass
  • @EmbeddedId
  • @GeneratedValue
  • @TableGenerator
  • @SequenceGenerator

You can also use these annotations to fine-tune how your database maintains the identity of your entities.


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