Hi again Prabu,
There are a plugin for Netbeans that works fine in Netbeans 6.8, I try it in Netbeans 7.0 and works fine too (the two tries I made was on MacOS with Snow Leopard).
You’ll find detailed info at :
http://vaadin.com/netbeans
http://vaadin.com/es/wiki/-/wiki/Main/Getting%20Started%20on%20NetBeans
http://wiki.netbeans.org/Vaadin
http://netbeans.org/kb/docs/web/quickstart-webapps-vaadin.html
And the plugin is available at:
Plugings Page at Netbeans.org
Cheers,
Javi.