title: Ninja Framework JSR303Validation in Filter
body: <p>I'm working on a Ninja JSON-based application in which I am implementing @JSR303Validation annotations across multiple controller methods. I'm currently checking validations in the controllers themselves by passing in the Validation object and calling <code>validation.hasBeanViolations()</code> to see if there are failures. If there are, I'm returning a failing Result to the client. </p>
  
  <p>Rather than doing this in the controller, I would like to validate requests using a Filter. However, I'm at a loss as to how to go about doing this? Could somebody help? As far as I can tell, you can't pass validations to a filter as a parameter, and the context.getValidation() object does not seem to be catching any validation failures.</p>