Glassfish: sun-web.xml missing

I'm currently trying to set up a secured folder with a few pages within my Java Web App to allow only registered users to access the pages in that folder.However, while trying to do the setup/mapping of the groups I have been having the issue that the sun-web.xml is missing. I'm using Netbeans IDE.Any ideas why this happened and how to fix it? I've done research and haven't really found a solution for the issue.Thanks in advance
 
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