Circular reference detected for service "doctrine.dbal.default_connection", path: "doctrine.dbal.default_connection".

Api.php

<?php

namespace Acme\AppBundle\Service;

use Doctrine\ORM\EntityManager;
use GuzzleHttp\Exception\RequestException;

/**
 * @todo Inject mailer
 */
abstract class Api
{
    public $client;
    public $mailer;
    public $entityManager;

    public function getClient() {
        return $this->client;
    }

    public function setClient($client) {
        $this->client = $client;
    }

    public function getMailer() {
        return $this->mailer;
    }

    public function setMailer(\Swift_Mailer $mailer) {
        $this->mailer = $mailer;
    }

    function getEntityManager() {
        return $this->entityManager;
    }

    function setEntityManager(EntityManager $entityManager) {
        $this->entityManager = $entityManager;
    }
}

ConfigurationListener.php

<?php

namespace Acme\AppBundle\EventListener;

use Doctrine\ORM\Event\LifecycleEventArgs;
// for Doctrine 2.4: Doctrine\Common\Persistence\Event\LifecycleEventArgs;
use Acme\AppBundle\Service\Api\Configuration as ApiService;
use Acme\AppBundle\Entity\Configuration;

class ConfigurationListener
{
    private $apiService;

    public function __construct(ApiService $apiService)
    {
        $this->apiService = $apiService;
    }

    public function getApiService() {
        return $this->apiService;
    }

    public function setApiService($apiService) {
        $this->apiService = $apiService;
    }

    public function postPersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();
        $entityManager = $args->getEntityManager();

        if ($entity instanceof Configuration) {
            $apiService = $this->getApiService();
            $apiService->sendConfiguration();
        }
    }
}

ConfigurationListener_workaround.php

<?php

namespace Acme\AppBundle\EventListener;

use Doctrine\ORM\Event\LifecycleEventArgs;
// for Doctrine 2.4: Doctrine\Common\Persistence\Event\LifecycleEventArgs;
use Acme\AppBundle\Entity\Configuration;

class ConfigurationListener
{
    private $apiService;

    public function __construct($container)
    {
        $this->container = $container;
    }

    public function postPersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();
        $entityManager = $args->getEntityManager();

        if ($entity instanceof Configuration) {
            $apiService = $this->container->get('api.configuration');
            $apiService->sendConfiguration();
        }
    }
}

services.yml

services:
    api.listener.configuration:
        class: Acme\AppBundle\EventListener\ConfigurationListener
        arguments:
            api_service: "@api.configuration"
        tags:
            - { name: doctrine.event_listener, event: postPersist }

    writer.configuration_request:
        class: Acme\AppBundle\Writer\ConfigurationRequest

    api.abstract:
        abstract: true
        class: Acme\AppBundle\Service\Api
        calls:
            - [setClient, ["@api.client"]]
            - [setMailer, ["@mailer"]]
            - [setEntityManager, ["@doctrine.orm.entity_manager"]]

    api.configuration:
        class:  "Acme\AppBundle\Service\Api\Configuration"
        parent: api.abstract
        calls:
            - [setWriter, ["@writer.configuration_request"]]

    api.client:
        class: GuzzleHttp\Client

services_fail2.yml

services:
    api.listener.configuration:
        class: Acme\AppBundle\EventListener\ConfigurationListener
        tags:
            - { name: doctrine.event_listener, event: postPersist }
        calls:
            - [setApiService, ["@api.configuration"]]

    writer.configuration_request:
        class: Acme\AppBundle\Writer\ConfigurationRequest

    api.abstract:
        abstract: true
        class: Acme\AppBundle\Service\Api
        calls:
            - [setClient, ["@api.client"]]
            - [setMailer, ["@mailer"]]
            - [setEntityManager, ["@doctrine.orm.entity_manager"]]

    api.configuration:
        class:  "Acme\AppBundle\Service\Api\Configuration"
        parent: api.abstract
        calls:
            - [setWriter, ["@writer.configuration_request"]]

    api.client:
        class: GuzzleHttp\Client

services_workaround.yml

services:
    api.listener.configuration:
        class: Acme\AppBundle\EventListener\ConfigurationListener
        arguments:
            container: "@service_container"
        tags:
            - { name: doctrine.event_listener, event: postPersist }

    writer.configuration_request:
        class: Acme\AppBundle\Writer\ConfigurationRequest

    api.abstract:
        abstract: true
        class: Acme\AppBundle\Service\Api
        calls:
            - [setClient, ["@api.client"]]
            - [setMailer, ["@mailer"]]
            - [setEntityManager, ["@doctrine.orm.entity_manager"]]

    api.configuration:
        class:  "Acme\AppBundle\Service\Api\Configuration"
        parent: api.abstract
        calls:
            - [setWriter, ["@writer.configuration_request"]]

    api.client:
        class: GuzzleHttp\Client

Exception:
[Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException]

Circular reference detected for service "doctrine.dbal.default_connection", path: "doctrine.dbal.default_connection".**

Related issues:

• symfony/symfony#8425 @peterrehm
• stephpy/timeline-bundle#24 @cbeyer @stephpy

Discussion:

• https://twitter.com/webdevilopers/status/603934748147359744

A current workaround is to inject the complete container and call the api.configuration service from there.

Bad practice?
http://stackoverflow.com/questions/7561013/injecting-securitycontext-into-a-listener-prepersist-or-preupdate-in-symfony2-to#answer-7562976

Since my listener does not depend on the postPersist event I replaced the tags inside the listener from doctrine.event_listener to kernel.event_listener.

Any progress on this? Came across the same issue.

Could it be simplified to: doctrine subscriber/listener with dependency?

Any progress yet?