AjaxTagsHave a look at http://ajaxtags.no-ip.info/, it shows few nice examples for basic ajac development. (.jsp)

The AJAX Tag Library is a set of JSP tags that simplify the use of Asynchronous JavaScript and XML (AJAX) technology in JavaServer Pages.

AJAX is primarily rooted in JavaScript. However, many server-side developers do not have an extensive knowledge of client-side programming in the browser. It’s much easier in some cases for J2EE developers, especially, to simply add a JSP tag to the page to gain the function desired.

Download a binary distribution of the AJAX JSP Tag Library