Retrieving list of Roles defined in web.xml

[Vinh Tran]

I would like to get a list of Roles listed in web.xml.  Is there a simple
way to retrieve info from this file or do I need to use a Digester?

 <security-constraint>
  <web-resource-collection>
   <role-name>Admin</role-name>
   <role-name>Tomcat</role-name>
   <role-name>Role1</role-name
  </auth-constraint>
 </security-constraint>

Thanks