Event Subscriber not being fired

[hsb1007]

Hi I don't seem to be able to get the event subscriber working...

I am using Symfony 4.1 and JMS Serializer 3.1

Below is what I have in /config/services.yaml

App\Event\Subscriber\SerializeSubscriber:
        tags:
            - { name: jms_serializer.event_subscriber }`

And below is my subscriber.

namespace App\Event\Subscriber;
use JMS\Serializer\EventDispatcher\Event;
use JMS\Serializer\EventDispatcher\Events;
use JMS\Serializer\EventDispatcher\EventSubscriberInterface;
use JMS\Serializer\EventDispatcher\PreSerializeEvent;
class SerializerSubscriber implements EventSubscriberInterface
{
    public static function getSubscribedEvents()
    {
        return array(
            array(
                'event' => Events::PRE_SERIALIZE,
                'method' => 'onPreSerialize',
                'format' => 'json', // optional format
                'priority' => 0, // optional priority
            ),
        );
    }

    public function onPreSerialize(PreSerializeEvent $event)
    {
        $test = 1;
    }
}

It does seem to get registered as subscriber in "RegisterEventListenersAndSubscribersPass"

When it actually gets built via 'SerializerBuilder::build' $this->listenersConfigured is set to false (But I am not sure if I am looking at the right place)..

Does anyone have any idea please?

[hsb1007]

I have resolved this myself..

Please note that I had to also do 'addDefaultListeners()' to include Doctrine Proxy Event Subscribers..

$builder->addDefaultListeners();
        $builder
            ->configureListeners(function(EventDispatcher $dispatcher) {
                $dispatcher->addSubscriber(new SerializationSubscriber($this->tokenStorage));
            })
        ;