I guess you should decide which sort of technology you want to use to present games on the web. Will they run on a http server or do you need an application server for that? You will need application servers for all java based applications that dont come as java applets.
Info about application servers you can find at www.apache.org
-> tomcat or at sun's site -> j2ee.
So I guess if you provide us with more info you will receive some more help here...