The Java Persistence API (JPA) for the application server defines the management of persistence and object/relational mapping within Java Enterprise Edition (Java EE) and Java Standard Edition (Java SE) environments.
The
Feature Pack for OSGi Applications and JPA 2.0 introduces support
for JPA 2.0 implementation in WebSphere® Application
Server.
The JPA API represents a simplification of the persistence programming model. JPA functions within the Java EE specification for Enterprise Java Beans (EJB) 3.0 and later requirements, managing persistence and object/relational mapping. The JPA specification defines the object/relational mapping within its own guidelines instead of relying on vendor-specific mapping implementations. These features make applications that use JPA easier to implement and manage.
JPA combines the best features from previous persistence mechanisms such as Java Database Connectivity (JDBC) APIs, Object Relational Mapping (ORM) frameworks, and Java Data Objects (JDO). Creating entities under JPA is as simple as Plain Old Java Objects (POJOs). JPA supports the features provided by JDBC without requiring the knowledge of the specific programming models defined by the various JDBC implementations. Like object-relational software and object databases, JPA allows the use of advanced object-oriented concepts such as inheritance. JPA avoids vendor lock-in because it does not rely on a strict specification like JDO and EJB 2.x entities.
The JPA implementation does not mandate that you migrate existing applications. Existing EJB 2.x Container Managed Persistence applications continue to execute without changes. JPA might not be ideal for every application, however, for many applications it provides a better alternative to other persistence implementations.
For detailed information about JPA, read the following topics:
Product support for JPA
Additional information
For additional information about OpenJPA, see the OpenJPA User Guide. For information about JPA specifications, see the related links. The information resides on both IBM and non-IBM Internet sites, whose sponsors control the technical accuracy of the information. Often, the information is not specific to this product but is useful all or in part for understanding the product. When possible, links are provided to technical papers and Redbooks® that supplement the broad coverage of the release documentation with in-depth examinations of particular product areas.
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