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Service needs to look like this

services:
    user.listener:
        class: AppBundle\EventListener\UserListener
        arguments: [ "@security.password_encoder" ]
        tags: [ { name: doctrine.event_listener, event: prePersist } ]

Listener should look like that

// AppBundle\EventListener\UserListener.php

namespace AppBundle\EventListener;

use Doctrine\ORM\Event\LifecycleEventArgs;
use AppBundle\Entity\User;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;

class UserListener
{
    protected $container;

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

    public function prePersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();

        $encodedPassword = $this->encoder->encodePassword($entity, $entity->getPassword());
        $entity->setPassword($encodedPassword);
    }
}

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