The ``createAccessDeniedException`` method was introduced in Symfony 2.5.

The:method:`Symfony\\Bundle\\FrameworkBundle\\Controller\\Controller::createAccessDeniedException`

method creates a special:class:`Symfony\\Component\\Security\\Core\Exception\\AccessDeniedException`

method creates a special:class:`Symfony\\Component\\Security\\Core\\Exception\\AccessDeniedException`

object, which ultimately triggers a 403 HTTP response inside Symfony.

Thanks to the SensioFrameworkExtraBundle, you can also secure your controller using annotations::

First of all, the class loader is loaded manually using a ``require``

statement, since there is no autoload mechanism yet. With the

:method:`Symfony\Component\ClassLoader\Psr4ClassLoader::addPrefix` call, you

:method:`Symfony\\Component\\ClassLoader\\Psr4ClassLoader::addPrefix` call, you

tell the class loader where to look for classes with the

``Symfony\Component\Yaml\`` namespace prefix. After registering the autoloader,

the Yaml component is ready to be used.