Interesting reading: The Top 5 New Annotations in JPA 2

Check this article regarding the new JPA 2 annotations which can easy the programmers life.

An abstract:

When the version 2 release of the Java Persistence API (JPA 2) was released in November 2009, it introduced a number of advancements and new features. Among them were new annotations to help simplify many common programming tasks that Java developers must perform when using JPA 2 for object relational mapping (ORM). In this article, we provide a reference list of the five most notable new annotations introduced in JPA 2, complete with code examples. We also highlight the changes made to existing JPA 1.x annotations in order to make them easier to use......

The rest of the article can be found here: http://www.developer.com/java/ent/article.php/3898336/article.htm