Tapestry5, JPA 2 and Hibernate

The documentation for Integrating JPA found on the Tapestry5 website was lacking.

1. It doesn't tell you that you have add the Tapestry-jpa dependency in you project POM
2. It uses EclipseLink
3. Explicitly tell you to use JPA 2.0 NOT JPA 2.1;

So, I had a few problems to fix after reading and following the docs. With much tinkering with my Tapestry5 (5.4-beta-35) project, I figured out:

1. To add the Tapestry-jpa dependency
   <dependency> <groupId>org.apache.tapestry</groupId> <artifactId>tapestry-jpa</artifactId> <version>5.4-beta-35</version> </dependency>
    
   
2. Hibernate 4.2 instead of EclipseLink
   <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>4.2.20.Final</version> </dependency>
   
3. Edit the persistence.xml header so it reads version=2.0 instead of 2.1. This is because my Netbeans IDE can generate the persistence.xml file but defaults to 2.1 version instead of 2.0.
   

And if you get a javax.persistence.PersistenceException: Unable to build EntityManagerFactory error during the build, you probably didn't add a hibernate.dialect property in your persistence.xml configs.