Symfony2 - Controller as a Service - Routing via annotations - symfony

Question

I am experimenting with creating controllers as services as shown at http://symfony.com/doc/current/cookbook/controller/service.html. I’ve followed this example and everything works fine when I have the route set in app/config/routing.yml. However when I try and set the route via annotations I get an error
My routing.yml file looks like this:
#hello:
# path: /hello/{name}
# defaults: { _controller: app.hello_controller:indexAction }
hello:
resource: "#EventBundle/Controller/HelloController.php"
type: annotation
My controller looks like this:
<?php
namespace Me\EventBundle\Controller;
//use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface;
use Symfony\Component\HttpFoundation\Response;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
//class HelloController extends Controller
class HelloController
{
private $templating;
public function __construct(EngineInterface $templating)
{
$this->templating = $templating;
}
/**
* #Route("/hello/{name}", name="hello")
*
*/
public function indexAction($name)
{
return $this->templating->renderResponse(
'EventBundle:Default:test.html.twig',
array('name' => $name)
);
}
}
As I say if I just use routing.yml and not the annotations the page renders correctly. However using annotations I get the error:
Catchable Fatal Error: Argument 1 passed to Me\EventBundle\Controller\HelloController::__construct() must be an instance of Symfony\Bundle\FrameworkBundle\Templating\EngineInterface, none given, called in /Library/WebServer/Documents/symfony-project/app/cache/dev/classes.php on line 2176 and defined
EDIT - as requested in comments:
service.yml looks like:
services:
app.hello_controller:
class: Me\EventBundle\Controller\HelloController
arguments: ['#templating']

Answer 1

The answer with thanks especially to #Artamiel and #Cerad was to add #Route(service="app.hello_controller") just above my class name, so it now looks like:
/**
* #Route(service="app.hello_controller")
*/
class HelloController
{
private $templating;
public function __construct(EngineInterface $templating)
{
$this->templating = $templating;
}
..........etc