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 doubt about deprecated api. Servlet specification has deprecated just SingleThreaded class. Loading multiple instance is fine as long as synchronization is take care in the servlet. Setting the number of servlet to be loaded is specific to application server. For eg: WebLogic has something like single-threaded-servlet-pool-size. Correct me if I am wrong.