For more information about the Java Persistence API, see
Java Persistence 2.0 API specification:
http://jcp.org/en/jsr/detail?id=317
EclipseLink, the Java Persistence API implementation in the GlassFish Server:
http://www.eclipse.org/eclipselink/jpa.php
EclipseLink team blog:
http://eclipselink.blogspot.com/
EclipseLink wiki documentation:
http://wiki.eclipse.org/EclipseLink