View source for EclipseLink/Release/2.4.0/JPA-RS

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The [http://www.eclipse.org/eclipselink/releases/2.4.php EclipseLink 2.4.0] release introduces an easy to use RESTful interface for accessing JPA persistence units and EJB session bean methods using REST calls with XML or JSON media types. With JPA-RS developers can now more easily expose their persistent data model and application logic over REST for the development of Thin Server Architecture (TSA) clients including HTML5/JavaScript and mobile.

'''Key Features'''
* Simple Enablement: The JPA-RS capability can be easily added to any Java EE application being deployed to any compliant Java EE server by simply adding JPA-RS components to an application. 
* Zero configuration: When enabled the exposed JAX-RS service will allow any persistence unit or related EJB to be accessed using simple REST calls. Optional configuration will be supported for developers who want to limit what capabilities are exposed or wish to customize the resources used in any REST operation.
* Dynamic JPA-RS: Enable the deployment of a generic JPA-RS application into a compliant Java EE server without requiring any included persistence units. This dynamic service will support provisioning of persistence units on the fly by passing in or providing reference to dynamic JPA configuration XML (persistence.xml and eclipselink-orm.xml using virtual entities).

[[Image:JPA-RS.png]]

== RESTFul API ==

When enabled JPA-RS will expose the complete capabilities of the persistence units defined within the application.

[[EclipseLink/Release/2.4.0/JPA-RS/REST-API]]

=== Persistence Unit Access ===

In order to use JPA-RS within a web application the JPA-RS library must be included within the WEB-INF/lib folder. JPA-RS contains a web-fragment.xml which at runtime extends the host application's web.xml to expose the JAX-RS end point.

== JAX-RS using Jersey ==

The JAX-RS reference implementation is Jersey ([jersey.java.net]). Additional support will be added to leverage Jersey's (add version) planned support for defining JAX-RS applications and resources using their API. The goal here is to allow JPA-RS to be declaratively configured without requiring any additional code to be included in a user's WAR/EAR.


== Security ==

By default all persistence operations and session beans are avaialble for remote access through JPA-RS. In order to restrict access to specific exposed operations standard Java EE security must be enabled. [[EclipseLink/Release/2.4.0/JPA-RS/Security | read more...]]

== Configurable Content ==

By default all entity types CRUD operations and named queries will be exposed by JPA-RS. Configuration of which URLs are available is through the security policy described above.

=== Additional URIs ===

In addition to the URI's for all defined named queries and entity types there should be support in JPA-RS to access server side application logic within EJB session beans.