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.
I hope I understood your question. I am assuming that u are asking if we could use our own action servlet instead of ActionServlet. To my knowledge,We can extend an ActionServlet and can use the action servlet that we have got. But in general it is not good practice to extend the ActionServlet. For most of the problems we have the plug-ins and the request processor.