This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
Tomcat comes with adequate documentation. Just study the way the Tomcat /examples applications JSP and servlets are arranged in the directory structure. Also study the tomcat/doc/appdef/index.html file. Bill