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.
You can create a context node with docBase attribute that points to your app's root directory.This can be done either in tomcat/conf/server.xml (old way) or in a context fragment file under tomcat/conf/Catalina/localhost.
If you create a context fragment file, the app will be auto-deployed as soon as you place the context fragment file in the localhost directory.