JAVA Frameworks - W3C Accessibility

Hi all,

I am looking for information about JAVA Frameworks for the development of an accessible Java web application with high-functionality features.  I wonder if RichFaces or ExtJs will allow me to develop an accessible web application.

Do you know any JAVA Framework to develop a web application without forgetting about W3C accessibility conformance?

Best,

Encarna Quesada
Virati - Interactive Communication