title: Changes to Input::json() function between Laravel 4 beta3 and beta4
body: <p>When I was developing in Laravel4 Beta3, I used to get JSON POST data from a service using Input::json() function, But when I updated to Laravel4 Beta4, I am getting following error:</p>
  
  <p>Notice: Undefined property: Symfony\Component\HttpFoundation\ParameterBag::$productName in /Applications/MAMP/htdocs/commonDBAPI/app/controllers/UserController.php line 47</p>
  
  <p>Does any one have any idea, what could be the reason.</p>
  
  <p>Thanks,</p>