If you've used Google Maps, Gmail or Microsoft's Outlook Web Access, you're familiar with the power of AJAX, which gives Web applications the responsiveness users associate with desktop applications.

Vest is a new framework-agnostic form validation library that separates the validation logic from the feature logic while using a unit testing syntax style that is similar to Mocha and Jasmine.

Oleg Mikheev looks under the hood of the Struts 2 validation mechanism and shows you how its Java, JavaScript, and Ajax support can take the pain out of Web-form validation.