Symfony2: Circular reference exception - Monolog & custom exception handler - php

Question

In an attempt to combine Monolog e-mailing errors with a custom exception handler I get the following:
[Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException]
Circular reference detected for service "router", path: "router ->
monolog.logger.router -> monolog.handler.grouped ->
mana.exception.listener -> templating -> twig ->
templating.helper.logout_url".
I make no claims to really know what I'm doing here, as evidenced by all the errors.
Services excerpt:
mana.exception.listener:
class: Mana\ClientBundle\EventListener\ExceptionListener
arguments: [#templating, #kernel]
tags:
- { name: kernel.event_listener, event: kernel.exception, method: onKernelException }
Config excerpt:
monolog:
handlers:
main:
type: stream
path: %kernel.logs_dir%/%kernel.environment%.log
level: debug
handler: grouped
grouped:
type: group
members: [mail, custom]
mail:
type: fingers_crossed
action_level: error
handler: buffered
buffered:
type: buffer
handler: swift
swift:
type: swift_mailer
from_email: error#projectmana.org
to_email: truckeetrout#yahoo.com
subject: An Error Occurred!
level: debug
custom:
type: service
id: mana.exception.listener
Custom handler:
class ExceptionListener {
protected $templating;
protected $kernel;
public function __construct(EngineInterface $templating, $kernel) {
$this->templating = $templating;
$this->kernel = $kernel;
}
public function onKernelException(GetResponseForExceptionEvent $event) {
// provide the better way to display a enhanced error page only in prod environment, if you want
if ('prod' == $this->kernel->getEnvironment()) {
// exception object
$exception = $event->getException();
// new Response object
$response = new Response();
// set response content
$response->setContent(
// create you custom template AcmeFooBundle:Exception:exception.html.twig
$this->templating->render(
'ManaClientBundle:Exception:exception.html.twig', array('exception' => $exception)
)
);
// HttpExceptionInterface is a special type of exception
// that holds status code and header details
if ($exception instanceof HttpExceptionInterface) {
$response->setStatusCode($exception->getStatusCode());
$response->headers->replace($exception->getHeaders());
} else {
$response->setStatusCode(500);
}
// set the new $response object to the $event
$event->setResponse($response);
}
}

Answer 1

It's your Exception Listener. Delete #kernel from the arguments array and you're fine
mana.exception.listener:
class: Mana\ClientBundle\EventListener\ExceptionListener
arguments: [#templating]
tags:
- { name: kernel.event_listener, event: kernel.exception, method: onKernelException }

Answer 2

Your custom exception listener probably depends on monolog either in the templating or kernel service.