access to servlets

[Oded Hasidi]

How can I prevent access to servlets through the:
 <http://> 
//servlet/com.package1.package2.ServletName">http://<web-site-address>/<app>/servlet/com.package1.package2.ServletName
 .
 
I want to grant access only to the mapped servlets in the web.xml file.
 
Thanks
 
Oded Hasidi