Hi,
If you put your application in the /server/servername/deploy folder, the HDScanner service would automatically scan the updated applications by checking the TimeStamps and redeploy the application.
This also shows up in the server log as first it undeploys the application and re-deploys the same with the updated changes.
There is nothing else that needs to be done.
Cheers,
Anandraj
http://weblogic-wonders.com