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.
The servlet API provides two classes that you might use as parent to your servlet. If your servlet is to be used to respond to typical HTTP GET or POST requests you would probably use javax.servlet.http.HttpServlet as the parent. If your servlet is to be more general, you might use javax.servlet.GenericServlet as the parent. One of the nice things about Tomcat is that it comes with complete JavaDocs for these packages. Bill