Test-driven software must often drop, create and populate database tables with records before it runs a suite of unit tests. For this reason, the ability to have JPA frameworks -- such as EclipseLink ...

Databases have no notion of inheritance between entities, so JPA providers like Hibernate must provide special features for defining object-oriented inheritance relationships in the database.

The JPA EntityManager is the key to Hibernate transaction management. Here's how to bring and commit transactions and persist data to the database for smooth, reliable transactions.