AcmeProjectBundle::home.html.twig

/path/Symfony/src/Acme/ProjectBundle/Resources/views/home.html.twig

//...
use SymfonyBundleFrameworkBundleTemplatingLoaderTemplateLocator;
use SymfonyBundleFrameworkBundleTemplatingTemplateNameParser;

class DefaultController extends AbstractController
{
    public function indexAction(TemplateNameParser $parser, TemplateLocator $locator)
    {
        $path = $locator->locate($parser->parse('AcmeProjectBundle::home.html.twig'));
        //...
    }
}