ZF2 and Doctrine Entity listeners resolver

Module.php

<?php
namespace Application;

class Module
{
    public function onBootstrap(MvcEvent $e)
    {
        $application    = $e->getTarget();
        $serviceManager = $application->getServiceManager();
        $sharedManager  = $application->getEventManager()->getSharedManager();
        $eventManager   = $e->getApplication()->getEventManager();

        $moduleRouteListener = new ModuleRouteListener();
        $moduleRouteListener->attach($eventManager);

        $listener = new \Application\Listener\UserListener($serviceManager)
        $em  = $serviceManager->get('Doctrine\ORM\EntityManager');
        $em->getConfiguration()->getEntityListenerResolver()->register($listener);
    }
}

UserListener.php

<?php
namespace Application\Entity\Listener;

use Zend\ServiceManager\ServiceManager;
use Doctrine\Common\Persistence\Event\LifecycleEventArgs as Event;
use Application\Entity\User;

class UserListener {

    /**
     * @var Zend\ServiceManager\ServiceManager $serviceManager
     */
	public $serviceManager;

    /**
     * Constructor
     */
    public function __construct(ServiceManager $serviceManager)
    {
    	$this->serviceManager = $serviceManager;
    }

    /**
     * prePersist
     */
    public function prePersist(User $user, Event $args)
    {
    	// pre persist
    }

    /**
     * postPersist
     */
    public function postPersist(User $user, Event $args)
    {
    	// var_dump($messageRecipient); exit();
        // send user confirmation email
        $entity = $args->getEntity();
        $entityManager = $args->getEntityManager();

        if($entity instanceof User) {
            $myService = $this->serviceManager->get('MyService');
            $myService->doSomething();
        }
    }
}