Apache OpenJPA has been gaining momentum in the JEE world, having been adopted by BEA as the EJB3 JPA implementation in WebLogic Server 10 and in the most recent EJB3 Feature Pack for IBM WebSphere Application Server (the first step before becoming a core feature of future commerical WebSphere releases). OpenJPA started its life in BEA's Kodo product, whose code was donated to the ASF in 2006. Since then, the project has grown to include broad application server and tool support:
InfoQ last May reported on OpenJPA possibly becoming a viable competitor to Hibernate, it seems that the liberal Apache license and quality Kodo implementation is allowing the project to get significant adoption from most of the other players in the community, both commercial and open source. One notable exception is Sun's Glassfish server (the Java EE RI), which bundles Toplink Essentials from Oracle. Oracle announced in March that it will be contributing all of the commercial Toplink to the Eclipse foundation as part of the Eclipselink project, the first releases set to be available sometime in July.
To assist in developing persistence applications OpenJPA works out-of-the-box with popular IDE's such as Eclipse and Netbeans. Additionally, plugin modules are available for the Apache Maven software project management and comprehension tool.The OpenJPA website also notes:
Many projects have adopted OpenJPA to provide the Object Relational Mapping for their needs, including Apache ActiveMQ, BEA Kodo, BEA WebLogic Server, Apache Camel, Apache Geronimo, Apache Ode, Apache OpenEJB, and IBM WebSphere Application Server. The community plans shortly to release version 1.0.0 of OpenJPA, reflecting the maturity and production quality of the code base.
Additionally, OpenJPA has been integrated with numerous other frameworks including Spring Framework, GlassFish, JOnAS Application Server, Sun Java System Application Server.
BEA Kodo: Kodo is the project from which the OpenJPA source code was derived. Kodo is now, in turn, based on the Apache OpenJPA project and is in production use in hundreds of mission-critical applications around the world. OpenJPA is included as part of Kodo 4.1 and higherOpenJPA recently graduated from the Apache Incubator to become a top-level project. The project's implementation of JSR-220 (Java Persistence API) also recently passed the JCP TCK at 100%, indicating full compliance with the standard.
WebSphere Application Server Version 6.1 Feature Pack for EJB 3 Alpha: The Alpha release of the IBM WebSphere Application Server Feature Pack for EJB 3.0 contains a preliminary implementation of the Enterprise JavaBeans Version 3.0 specification, commonly known as EJB3. Associated with the Enterprise JavaBeans Version 3.0 specification is the Java Persistence API specification, commonly known as JPA. The Alpha JPA implementation is powered by OpenJPA.
InfoQ last May reported on OpenJPA possibly becoming a viable competitor to Hibernate, it seems that the liberal Apache license and quality Kodo implementation is allowing the project to get significant adoption from most of the other players in the community, both commercial and open source. One notable exception is Sun's Glassfish server (the Java EE RI), which bundles Toplink Essentials from Oracle. Oracle announced in March that it will be contributing all of the commercial Toplink to the Eclipse foundation as part of the Eclipselink project, the first releases set to be available sometime in July.
