JPA Annotation

GeneratedValue

Target: METHOD, FIELD
Implemented Interfaces:
Annotation
Specifies a generation strategy for generated primary keys.

The GeneratedValue annotation may be applied to a primary key property or field of an entity or mapped superclass in conjunction with the Id annotation. The persistence provider is only required to support the GeneratedValue for simple primary keys. Use of the GeneratedValue annotation for derived primary keys is not supported.

Example 1:

 {@snippet :
See Also:
GenerationType
Id
TableGenerator
SequenceGenerator
Since:
JPA 1.0
The Auto Generated Values article explains how to use GeneratedValue.

Public Annotation Attributes

String generator default ""
(Optional) The name of the primary key generator to use, as specified by the SequenceGenerator or TableGenerator annotation which declares the generator.

The name defaults to the entity name of the entity in which the annotation occurs.

If there is no generator with the defaulted name, then the persistence provider supplies a default id generator, of a type compatible with the value of the GeneratedValue.strategy member.

Since:
JPA 1.0
GenerationType strategy default AUTO
(Optional) The primary key generation strategy that the persistence provider must use to generate the annotated entity primary key.
Since:
JPA 1.0