Some new features of JPA 2.0:
- JPA 2.0 Spec will be decoupled from EJB 3.0
- Better support for embaddable classes
- Better validation support (private @Length(5), @Max(2), @Required - perhaps in align with JSR-303)
- Support of collections of basic types Set<String>
- Support for Mapped Superclasses for Embeddables (so the state of a super Embeddable can be subclassed)
- Support for ordered lists - the order of the items should remain persistent
- The access strategy will be extended so in one entity several access types can be used. For this purpose a new Annotation e.g. @AccessType(PROPERTY|FIELD) might be used.
- @OneToMany mapping is going to be extended, so that the natural way of modelling FKs in the target table will be mandatory (in JPA 1.0 it is optional).
- Expanded support for O/R Mapping - Table per concrete class strategy is going to be mandatory
- In JPA 1.0 all queries are polymorphic, in JPA 2.0 there will be a restriction in place
- JPA 2.0 will support criterias - instead of string concatenation there will be a more fluent way to define queries
- The HashMap like hints (e.g. logging, caching) are going to be standardized
- Standardization of the Unfetched State (now it is undefined what happens)
- EntityManager could be joined to an existing transaction (e.g. with a method joinTransaction())
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