Get your CodeRanch badge!*
The moose likes Object Relational Mapping and the fly likes JPA Query Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Databases » Object Relational Mapping
Bookmark "JPA Query " Watch "JPA Query " New topic
Author

JPA Query

Abhijit Rai
Ranch Hand

Joined: Aug 07, 2008
Posts: 41
Hi ,
I am of the view that JPA may be used for standalone applications (i.e. even without a server(web/application)),
dragged along by this belief I ventured along to make an application

I made an entity class :Cabin


and a client class: StandaloneClient



also I have persistence.xml within META-INF in my classpath




and all I get is a Fat exception :


Is it possible to use JPA the way I want to use it . If yes ,how do we get over this exception( does any one have the postal address for the Persistence provider ) .
Thanks everyone for helping out


SCJP5 ,SCWCD5
Cameron Wallace McKenzie
author and cow tipper
Saloon Keeper

Joined: Aug 26, 2006
Posts: 4968

You don't need any of those silly "Servlet Engines" or overrated "Application Servers" to work with JPA. All you need is a persistence provider; that is, someone who knows how to process JPA stuff, and you're good.

Hibernate is probably the most popular JPA implementation framework. Here's a little class that I can annotate with JPA tags, and pass into the Hibernate Session/EntityManager, and have it persist my data to a database:




As you can see, that's all done in a main method - that is, it's done in a standalone Java application that runs on nothing more than a Java 5 JRE. No EJB or Servlet containers are harmed in the running of this code.

Here's a little tutorial in which I detail how to set up this particular configuration with Hibernate and run the code. There's nothing to it, actually:
Using the Java Persistence API (JPA) in a Stand-Alone Java Application (no containers!)

So, in summary, you do not need a J2EE / JEE5 container in order to work with the Java Persistence API.

Regards,

-Cameron McKenzie

Abhijit Rai
Ranch Hand

Joined: Aug 07, 2008
Posts: 41
Hey Cameron,
Thanks mate ,awesome reply ,was like a beautiful sun ray tearing the dark clouds away .
The link was quite useful too . Just as you did I added a main method in my Cabin class and it works like a charm .


Also the Hibernate configuration xml looks like :


Thanks again , Cheers
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: JPA Query
 
Similar Threads
Cant deploy the entity bean
JPA using Hibernate - Entity Manager doubts
TestEJB not bound
Cant deploy the entity bean
NamingException: Could not dereference object - EJB 3.0 workbook ex05-2