How to programatically start j2ee application/service from command line

Hi all

We have developed a j2ee application and deployed the .ear file on SAP J2EE (Netweaver'04) engine.

We are able to successfully start/stop the application from Visual administrator -> Deploy -> Service -> Start application (or) Stop application.

We need to start and stop the same application programatically or via command line instead of doing it from VA. Any thoughts from anyone on how to do it ?

Thanks in advance.

Regards

Nagesh