- JPA annotation element

Annotation Element
String name

(Optional) The name of the persistent field or property of the associated entity that is used as the map key.

Default: If the name element is not specified, the primary key of the associated entity is used as the map key. If the primary key is a composite primary key and is mapped as IdClass, an instance of the primary key class is used as the key.

Default value:
JPA 1.0