This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
This wouldn't have anything to do with "path variables;" it's more a question of how your web app is configured (unless it's the even simpler problem that you don't have a file by a given name.) This isn't really Tomcat-specific; if you tell me a little more about your web app I'll know where to move this topic to so you can get the help you need.