RESTFul validation using Spring

Since last couple of week I was trying to figure “How RESTFul validation should be done in Spring”. Also how to approach exception handling we do not want to mandate Spring MVC usage at as view layer”. There is not enough article over internet on approach. I can see a lot of developer seeking information/help from Spring forum but there is long silence over this topic in forum.

http://forum.springsource.org/showthread.php?116933-RESTFul-Validation-approach
https://jira.springsource.org/browse/SPR-6709
http://forum.springsource.org/showthread.php?108760-Validation-in-REST-API

Finally I decided to evaluate couple of approach to nail down above stated problem and its benefit/issue. I was able implement custom RESTFul validation using spring validator as core. In blog I will discuss one possible approach. I would welcome your comment and better approach to achieve this feature. More