Backend\Core\Engine\Base\Cronjob::execute PHP Method

    public function execute()
    {
    }

 /**
  * @return Response
  */
 public function display()
 {
     $this->cronjob->execute();
     // a cronjob does not have output, so we return a empty string as response
     // this is not a correct solution, in time cronjobs should have there own frontcontroller.
     return new Response('');
 }