title: Annotations needed to validate request data from set of values
body: <p>Is there any annotation provided by spring to validate the input values from predefined set ?</p>
  <p><strong>Requirement</strong> validate roles assign to user, and Role value should be either <code>user</code>, <code>admin</code>, <code>moderator</code>.</p>
  <p>Can I validate at the time when request comes in controller ?</p>