Tutorial on JPA mapping file

Question

Is there a great tutorial on how to use JPA mapping file? Accompanying related source code for the mapping file would be great also.

Answer 1

Simple Tutorial

A bit more in depth Tutorial

Answer 2

Tutorial for JPA is http://www.datanucleus.org/products/accessplatform_1_1/guides/jpa/tutorial.html and info specific to mapping file http://www.datanucleus.org/products/accessplatform_1_1/jpa/metadata_xml.html

Answer 3

There is also a good doc. on the different entity configurations here: http://docs.jboss.org/hibernate/stable/entitymanager/reference/en/html_single/#configuration