Difference between revisions of "EclipseLink/Development/JPA"
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== Community ==
== Community ==
votes https://bugs.eclipse.org/bugs/buglist.cgi?bug_severity=blocker&bug_severity=critical&bug_severity=major&bug_severity=normal&bug_severity=minor&bug_severity=trivial&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&chfield=%5BBug%20creation%5D&chfieldto=Now&classification=RT&product=EclipseLink&query_format=advanced&votes=1&order=votes&query_based_on= ]
== Advanced JPA ==
== Advanced JPA ==
Revision as of 15:46, 11 December 2009
EclipseLink 2.1.0 Status - Complete - shipped Dec 10th
This Page tracks the current work being done by the EclipseLink JPA team towards the 2.1.0 release. 2.1.0 is targetting a ship date of June 23rd 2010.
A goal of the 2.1.0 release is to look at bugs with submitted patches with the intent to include the patch fix. Bugs will be looked at using this Queue, and an attempt to use the attached fix will be made.
Using the bug votes as a guideline, the 2.1.0 bugs fixes will use this queue as a guideline
EclipseLink 2.0.0 Status - Complete - shipped Dec 10th
EclipseLink JPA 2.0 Implementation Status
The EclipseLink project has been chosen to deliver the JPA 2.0 reference implementation as part of JSR 317. This page provides a summary of the work planned and the current status.
The following are features known to be required for JPA 2.0
|MetaModel API||Completed||bug 266912, Spec||Runtime Metamodel API implementation. 20091122|
|Criteria API||Assigned||bug 249218, Spec||This will be an object oriented query construction api.|
|Validation||Completed||bug 266927, Spec||Through this feature EclipseLink JPA will integrate with the Validation APIs. (JSR-303)|
|EntityManager/Query API||Assigned||bug 00000, Spec||Add support for the new EntityManager and Query APIs.|
|Cache Usage Settings||Completed||bug 277039, Spec||Settings to allow fine grained control of second level cache usage.|
|Typesafe MetaModel Generation (APT)||Completed||bug 267391, Spec||APT based canonical metamodel generation.|
|1:1 JoinTable||Completed||bug 282553, Spec||Join table support for 1-1 and M-1 mappings.|
|Pessimistic Locking Scope||Completed||bug 280803, Spec||The new version of the specification provides a setting to extend pessimistic locking to certain relationships of the locked entity.|
|Persistence Utils||Completed||bug 281884, Spec||This feature covers the implementation of the new PersistenceUtils helper interfaces.|
|Properties Processing||Completed||bug 000000, Spec||The new version of the specification provides a means to dynamically specify properties on the EntityManager. The goal of this feature will be to define our properties processing and validation.|
|JPA 1.0 Compatibility||Ongoing||Spec||Ensure that EclipseLink libraries with JPA 2.0 functionality will be able to run on JPA 1.0 compliant application servers.|
|Schema/Catalog on SequenceGenerator||Completed||bug 283759||Schema/Catalog specified in SequenceGenerator should not be ignored.|
|JoinTable override||Completed||bug 278768, Spec||JoinTable from association override support (metadata processing)|
|Uni-directional 1:M||Completed||bug 241414, Spec||Provide EclipseLink functionality to support a uni-directional OneToMany mapping that does not use a join table. This mapping will be similar to EclipseLink's current AggregateObjectMapping.|
|Access Type||Completed||bug 241651, Spec||Provide support for configurable access type|
|Pessimistic Locking||Completed||bug 248489, Spec||Adding support for EntityManager APIs and functionality for Pessimistic locking|
|Nested Embedding||Completed||bug 207823, Spec||Embedded objects can nest other embedded objects as well as being able to have relationships to entities.|
|Cache API||Completed||bug 248780, Spec||Add support for the new Cache APIs.|
|New Collection Mappings||Completed||bug 48293, bug 265359, Spec||Collections of embedded objects (aka Aggregate Collections) or of simple objects (Direct Collections)|
|Derived Identifiers||Completed||bug 241765, Spec||Relationship mappings can be used as Id's or components of compound Id's directly without the need for separate primitive attributes.|
|Extended Map Support||Completed||bug 241410, Spec||Maps can have keys and values that can be any of basic, entity, or embedded. These are stored in a target table or join table.|
|MappedById||Completed||bug 270011, Spec||Derived Ids that are also defined in an embeddableid mapping|
|Orphan Removal||Completed||bug 249033, Spec||When this option is set on a relationship if a child object is removed from the relationship it must be deleted.|
|TABLE_PER_CLASS Inheritance||Completed||bug 249860, Spec||Add support for TABLE_PER_CLASS inheritance strategy. Optional feature from JPA 1.0|
|Entity Type Expressions||Completed||bug 252009, Spec||JPA 2.0 QL has added syntax to allow restriction of query results by Entity Class type|
|Collection Params for IN||Completed||bug 252038, Spec||IN() in JPQL can now accept a single collection parameter.|
|Ordered Lists||Completed||bug 249037, Spec||Order of list is persisted to an "order column" when writes occur|
|Case Expressions||Completed||bug 252491, Spec||Case style expressions have been introduce to JPQL and Criteria API|
|Standard Properties||Completed||bug 249023, Spec||Add support for new javax.persistence properties.|
|JPQL Updates||Completed||bug 249224, Spec||JPA 2.0 introduces certain JPQL updates that do not correspond to other features.|
|Undelimited Identifiers||Completed||bug 251908, Spec||This feature covers specifying and processing metadata Identitfiers.|
|Jarfile URL||No Work Necessary||bug 281887, Spec||The specification has redefined the base for the jar-file url in the persistence.xml.|
|Tuple results from JPQL queries||Deferred||bug 289141, Spec||JPQL queries are translatable to Tuple results. Support in the parser needs to be added for this.|
Bug Queries and Reports
EclipseLink will introduce JPA 2.0 features with the following goals in mind:
- Remain a compliant JPA 1.0 implementation during the development of 2.0 functionality. This is a major requirement since we are working towards a 1.0 release of EclipseLink which must be JPA 1.0 compliant.
- This generally means that the JPA 1.0 persistence.jar could be on the classpath and the product should function as expected
- Conform with the Eclipse IP process and rules. This means that the use of any updated persistence libraries and their source must come into the project through proper IP review procedures.
- All new features involving changes to JPA's ORM-XML schema must be reflected in Eclipse-ORM.XML. This should be done in such a way that changes during the evolution of the specification are minimized.
- Where possible any new features added for JPA 2.0 should also be available to users of the native EclipseLink ORM API and metadata. Accessibility through the native API can be limited to programmatic access and configuration.
- EclipseLink users using JPA 1.0 will be able to access 2.0 preview functionality through native EclipseLink API or metadata
Types of Changes
The JPA 2.0 expert group is attempting to evolve this new specification to remain backwards compatible with JPA 1.0. The scope of its work will involve changes of various types with different effects on EclipseLink.
- Metadata Changes
- New Annotations
- New structures in the persistence.xml XSD
- New structures in the ORM.XML XSD
- API Changes
- New interfaces
- New methods on existing interfaces
We will be developing this functionality within the main product stream. Specification defined interfaces will be created and packaged within a javax.persistence_2.0 bundle/jar for users who wish to preview the functionality. To remain backward compatible with JPA 1.0 we will be packaging any interfaces we must link with for JPA 2.0 within the eclipselink JPA bundle/jar. As this bundle/jar will not contain the EMF API users will be required to choose their JPA version by using the appropriate persistence bundle/jar. Not bundling all the interfaces allows us to produce a single EclipseLink JPA bundle/jar while alleviating the concern of user's hitting preview code when they do not expect to.
Class file to be included in EclipseLink JPA bundle
The following changes need to be handled keeping the backwards compatibility to JPA 1.0 goals in mind:
- New Annotations
- Modified Annotations
- Changes to the XML Schemas
- new Interfaces
- reference to new interfaces