public function onRequestException(ResponseExceptionEvent $event)
 {
     $event->stopPropagation();
     $event->setResponse(new Response($event->getException()->getMessage()));
     $event->getKernel()->shutdown();
     $this->responseEvent = $event;
 }
 public function exception(ResponseExceptionEvent $event)
 {
     $event->stopPropagation();
     $event->getKernel()->shutdown();
     $this->writeException($event->getException(), new Output());
     exit(1);
 }