 <p>Please use <a href="http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html_single/" rel="nofollow">http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html_single/</a> link for reference. But if you will tell what specific you are looking for I might be able to help you better. Here is little detail about @GeneratedValue annotation… I love this blog post on same topic <a href="http://elegando.jcg3.org/2009/08/hibernate-generatedvalue/" rel="nofollow">http://elegando.jcg3.org/2009/08/hibernate-generatedvalue/</a>. He has done good job explaining. </p>