title: Spring @RequestParam mapping Boolean based on 1 or 0 instead of true or false
body: <p>Why is Spring 3.2 only mapping my Boolean based on that the requestparam is "0" or "1" ? </p>
  
  <pre><code>@RequestParam(required= false, defaultValue = "false") Boolean preview
  </code></pre>
  
  <p>Preview will only be <code>"true"</code> when the requestparam is <code>"?preview=1"</code> which is wierd</p>
  
  <p>I want it to be <code>"?preview=true"</code>. How do I do that?</p>