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Example below redirects user to a certain route when 404 NotFoundHttpException error occurs. It is done with onKernelException event listener and RedirectResponse() class.


class: Application\BackendBundle\EventListener\KernelExceptionListener
arguments: [@router]
- { name: kernel.event_listener, event: kernel.exception, method: onKernelException }


If HTTP 404 Not Found error occurs anywhere in your application, we get redirected to the home page.

namespace Application\BackendBundle\EventListener;

use Symfony\Bundle\FrameworkBundle\Routing\Router;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

class KernelExceptionListener
private $router;
private $redirectRouter = 'application_frontend_default_index';

public function __construct(Router $router)
$this->router = $router;

public function onKernelException(GetResponseForExceptionEvent $event)
$exception = $event->getException();

if ($exception instanceof NotFoundHttpException) {
if ($event->getRequest()->get('_route') == $this->redirectRouter) {

$url = $this->router->generate($this->redirectRouter);
$response = new RedirectResponse($url);