JPA orm edit...

I am trying to include JPA orm in my test app. Will update details here as it progresses.

my material:
http://www.objectdb.com/api/java/jpa/annotations/orm

http://www.objectdb.com/api/java/jpa/Inheritance

http://stackoverflow.com/questions/4832544/jpa-2-foreign-key-that-only-includes-one-field-from-a-composite-primary-key