title: Spring MVC check username in db before submission
body: <p>I am making a web application using Spring MVC and jsp. I am quite new to this and really struggling to find an approach to validating a username from DB before submitting the form. Here is a demo of the kind of thing am looking for <a href="http://www.bitrepository.com/demo/username-checker/" rel="nofollow noreferrer">http://www.bitrepository.com/demo/username-checker/</a></p>
  
  <p>Would appreciate any help given. Thank you</p>