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.
You can start off looking at the logs generated by Tomcat, they are ususally in <Tomcat Home>/logs folder. If you have Tomcat manager application installed, check if your webapp shows up in the list of apps running.