This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori 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.