Java Persistence/What is new in JPA 2.0?
< Java PersistenceThe JPA 2.0 specification adds several enhancements to the JPA 1.0 specification including:
- Extended Map support - Support for maintaining a key column for a
Basic,Embeddable, orEntitykey value in any collection relationship using aMap. - Derived Identifiers
- Nested embedding
- New collection mappings - Support for collections of
BasicorEmbeddabletypes. - Undirectional OneToMany
- Ordered List mappings - Support for maintaining an index column in any collection relationship using a
List. - Orphan removal - Automatic deletion of objects removed from relationships.
- Pessimistic Locking
- EntityManager API updates
- Cache APIs
- Standard Properties
- Metadata
- Criteria API
- JPQL enhancements
Resources
- JPA 2.0 Spec
- JPA 2.0 Reference Implementation (EclipseLink)
- Eclipse EclipseLink to be JPA 2.0 Reference Implementation
- JPA 2.0 Examples
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