routing:

CaasSampleBundle:
    resource: "@CaasSampleBundle/Controller/"
    type:     annotation
    prefix:   /

Controller


<?php

namespace Caas\Bundle\SampleBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Template;
use Caas\Bundle\SampleBundle\Form\LoginType;

class DefaultController extends Controller
{

    /**
     * @Route("/login", name="login")
     * @Template()
     */
    public function loginAction()
    {
        $form = $this->get('form.factory')->create(new LoginType());

        return array('form' => $form->createView());
    }

}