HelloController.php

<?php
namespace Application\HelloBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;

/** @Controller */
class HelloController extends Controller
{
    protected $userRepository;

    /** @Inject */
    public function setUserRepository($userRepository)
    {
        $this->userRepository = $userRepository;
        return $this;
    }

    public function indexAction($name)
    {
        $user = $this->userRepository->findOneByName($name);
        return $this->render('HelloBundle:Hello:index', array('user' => $user));
    }
}

UserRepository.php

<?php
namespace Application\HelloBundle\Repository;

use Doctrine\ORM\EntityRepository;

/** @Service */
class UserRepository extends EntityRepository
{
    protected $logger;

    /** @Inject("zend.logger") */
    public function setLogger($logger)
    {
        $this->logger = $logger;
        return $this;
    }

    public function createUser($user)
    {
        $this->_em->persist($user);
        $this->logger->info('User ' . $user->getName() . ' successfully persisted.');
    }
}