JPA with Hibernat

http://www.developer.com/java/ent/article.php/10933_3577101_1

http://www.onjava.com/pub/a/onjava/2007/02/08/an-introduction-to-hibernate-3-annotations.html

more on

http://www.i-proving.ca/space/Technologies/Hibernate/Hibernate+Annotation+Examples/Collection+of+Elements


http://www.javakaffee.de/blog/2006/11/28/hibernate-annotation-for-a-map-of-some-enum-type-to-some-primitive-type/