Symfony2 - Inject the currently logged in user into a listener

I am trying to inject the currently logged in user into a Listener. My goal is to write a current \DateTime() to the 'last_active' column of my 'demo_user' table every time the user does any action (both of this this methods do not work for me) . app/config/config.yml ``` # ... services: demo.listener: class: Demo\UserBundle\EventListener\ActivityWatcher.php arguments: ['@service_container'] tags: - { name: doctrine.event_listener, event: postLoad } ``` src/Demo/UserBundle/EventListener/ActivityWatcher.php ``` namespace Demo\UserBundle\EventListener; use Doctrine\ORM\Event\LifecycleEventArgs; use Symfony\Component\DependencyInjection\ContainerInterface; use Demo\UserBundle\Entity\DemoUser; class ActivityWatcher { protected $container; public function __construct(ContainerInterface $container) { $this->container = $container; } public function postLoad(LifecycleEventArgs $args) { $entity = $args->getEntity(); $entityManager = $args->getEntityManager(); if ($entity instanceof DemoUser) { $token = $this->container->get('security.context')->getToken(); $user = $token->getUser(); if($entity->getId() == $user->getId()) { $entity->setLastActivity( new \DateTime() ); $entityManager->persist($entity); $entityManager->flush(); } } } } ``` But the $token is always empty... UPDATE: Didn't mention, that I'm logged in and authenticated when this happens ``` FatalErrorException: Error: Call to a member function getUser() on a non-object ... ``` Any ideas? Arrgh, thanks, Jan UPDATE: I also tried only to inject the security.context: ``` arguments: ["@security.context"] ``` but got a ``` ServiceCircularReferenceException: Circular reference detected for "doctrine.orm.default_entity_manager", path: "doctrine.orm.default_entity_manager -> doctrine.dbal.default_connection -> wwk.listener -> security.context -> security.authentication.manager -> security.user.provider.concrete.administrators". ```