You only need to do two things.
First, create your virtual server. No reason to set a default web app or anything, simply created a virtual server with the default settings.
Then, deploy your war.
If you deploy it through the console (or the admin CLI) you can tell the server to use "/" as the context root, and it will be deployed and "www.vhost1.com/index.jsp".
Or, you set up the sun-web.xml to tell the server which context path you would like to use (i.e. "/"), and it will use that on deploy.
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