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 implement this using FORM based authentication taken care by container. Refer here an example when using Tomcat server. For other servers like WAS, the mappings should be done through admin consoles.