The google web toolkit provides a kickass infrastructure for creating ajax-powered web apps right from java code. The gwt compiler will transform the java into javascript and the results are stunning. Here are 2 very sweet links for easy learning the basics of GWT, mainly the RPC (remote procedure call) feature:
http://www.vogella.de/articles/GWT/article.html
http://developerlife.com/tutorials/?p=125
http://www.vogella.de/articles/GWT/article.html http://developerlife.com/tutorials/?p=125
