# JPA 2.0 update from JavaONE - important improvements

Some
new features of JPA 2.0:

JPA 2.0 Spec will be
     decoupled from EJB 3.0Better support
     for embaddable classesBetter
     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 persistentThe 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
     mandatoryIn JPA 1.0 all
     queries are polymorphic, in JPA 2.0 there will be a restriction in placeJPA 2.0 will
     support criterias - instead of string concatenation there will be a more
     fluent way  to define queriesThe HashMap
     like hints (e.g. logging, caching) are going to be standardizedStandardization
     of the Unfetched State (now it is undefined what happens) EntityManager
     could be joined to an existing transaction (e.g. with a method
     joinTransaction())JPA 2.0 is scheduled together with JavaEE 6.