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ProJPA2 book

Emmanuel Garcia
Greenhorn

Joined: Feb 24, 2009
Posts: 12

I a newby with EJB3.0 but I have worked wiith Hibernate and its persistence API and I know Spring and I can see that Spring uses
persistence with Hibernate, Ibatiz or JPA.

My questions are, if you want to work with JPA ,Is it tied with EJB 3.0? Can I work with JPA without work with EJBs ?

I believe thath JPA is a API as such JDBC, only interfaces, the implementation can be with Hibernate or openJPA, Is it correct ?

Regards.
Jeanne Boyarsky
author & internet detective
Marshal

Joined: May 26, 2003
Posts: 30762
    
156

Yes. There are implementations that having nothing to do with EJB or application servers


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Mike Keith
author
Ranch Hand

Joined: Jul 14, 2005
Posts: 304
The fact that Spring offers integration with JPA is a good indicator that JPA works without EJB.

JPA was initially developed within the EJB 3.0 expert group and released as a separate document but as part of the EJB 3.0 spec (that is why the previous book was called "Pro EJB 3: Java Persistence API"). Although JPA could always be used independent of EJB, when JPA 2.0 work began it was as a completely separate expert group, making its independence from EJB more obvious. Think of it as a portable persistence API equivalent to Hibernate, but that has additional integration support built right into all of the existing Java EE components, plus Spring, Google App Engine, or any other popular Java container/framework.

Every popular persistence implementation implements it, with 3 major open source products among them: Hibernate, EclipseLink and OpenJPA. EclipseLink is the only one that is currently compliant with JPA 2.0, but the others will definitely follow. The key advantage of using JPA is that your application is not bound to a particular implementation because the JPA spec defines a way for the implementations to be transparently plugged in under the covers.


-Mike
Pro JPA 2: Mastering the Java Persistence API
Emmanuel Garcia
Greenhorn

Joined: Feb 24, 2009
Posts: 12
Thanks Mike and thanks Jeanne Boyarsky for you comment.



 
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subject: ProJPA2 book