How to configure JPA to use JNDI?

Question

I have a working persistence definition that works on java level tests. Now I want to incorporate that into a web application which defines the database connection as JNDI in the context.xml. What do I need to change to make it work with the JNDI instead of the persistence.xml or at least get the infor from there?

Answer 1

Your persistence.xml beginning should be something like this (using EclipseLink as implementation), for a jdbc/MYNAME JNDI name:

<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
  <persistence-unit name="myPersistenceUnit" transaction-type="RESOURCE_LOCAL">    
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <non-jta-data-source>java:comp/env/jdbc/MYNAME</non-jta-data-source>
    <class>org.test.entity.MyEntity</class>
...
  </persistence-unit>
<persistence>

Of course you should set the configuration suitable for your environment. In the example I use a non-JTA DataSource: according to one of your comments, it seems your DataSource is not JTA-compliant. For Hibernate, the persistence provider should be different.