The service X does not implement the EventSubscriberInterface - symfony

Question

For some reason I get an exception that my class SerializeListener does not implement the class EventSubscriberInterface. The SerializeListener called as a service on preSerialize.
As you can see the interface is implemented and the function of the interface aswell:
Full exception:
RuntimeException: The service "acme.serializelistener" (class: Acme\DemoBundle\EventListener\SerializeListener) does not implement the EventSubscriberInterface.
Config.yml
services:
json_formatter:
class: Monolog\Formatter\JsonFormatter
acme.serializelistener:
class: Acme\DemoBundle\EventListener\SerializeListener
tags:
- { name: jms_serializer.event_subscriber }
EventSubscriberInterface
<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien#symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\EventDispatcher;
/**
* An EventSubscriber knows himself what events he is interested in.
* If an EventSubscriber is added to an EventDispatcherInterface, the manager invokes
* {#link getSubscribedEvents} and registers the subscriber as a listener for all
* returned events.
*
* #author Guilherme Blanco <guilhermeblanco#hotmail.com>
* #author Jonathan Wage <jonwage#gmail.com>
* #author Roman Borschel <roman#code-factory.org>
* #author Bernhard Schussek <bschussek#gmail.com>
*
* #api
*/
interface EventSubscriberInterface
{
/**
* Returns an array of event names this subscriber wants to listen to.
*
* The array keys are event names and the value can be:
*
* * The method name to call (priority defaults to 0)
* * An array composed of the method name to call and the priority
* * An array of arrays composed of the method names to call and respective
* priorities, or 0 if unset
*
* For instance:
*
* * array('eventName' => 'methodName')
* * array('eventName' => array('methodName', $priority))
* * array('eventName' => array(array('methodName1', $priority), array('methodName2'))
*
* #return array The event names to listen to
*
* #api
*/
public static function getSubscribedEvents();
}
SerializeListener:
<?php
namespace Acme\DemoBundle\EventListener;
use JMS\Serializer\EventDispatcher\PreSerializeEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
class SerializeListener implements EventSubscriberInterface
{
public static function getSubscribedEvents()
{
return array(
array('event' => 'serializer.pre_serialize', 'method' => 'onPreSerialize'),
);
}
public function onPreSerialize(PreSerializeEvent $event)
{
var_dump($event);
}
}

Answer 1

You should implement the JMS\Serializer\EventDispatcher\EventSubscriberInterface instead of Symfony\Component\EventDispatcher\EventSubscriberInterface. See the JMSSerializerBundle's RegisterEventListenersAndSubscribers DIC compiler pass.