EclipseLink JPA - location of persistence.xml

Question

I am using JPA for a java class and having trouble putting the persistence XML file where it should be.

The IDE i am using is Eclipse Helios. Eclipselink jar files are downloaded and added to my JRE System Library and all. I wrote up the persistence.xml with the tag after getting the following error :

Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named customers

Provider tag:

<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

The program still doesn't run so i am wondering where should I place persistence.xml (ie src/main/resources, or lib/META-INF... etc )

Answer 1

persistence.xml should be put inside an directory called META-INF under the root of the classpath .

Right click your project in eclipse ==> Properties ==> Java Build Path . Suppose you configure one of the build paths to be /src/main/resources , then you should put the persistence.xml at /src/main/resources/META-INF/persistence.xml

Answer 2

JPA persistence XML file location

Traditionally, the persistence.xml is located in a META-INF folder that needs to reside in the root of the Java classpath. If you're using Maven, you can store it in the resources folder, like this:

src/main/resources/META-INF/persistence.xml