Symfony ile nasıl kişisel exception oluşturulur

# sport/src/Football/FrontendBundle/Exception/CountryException.php
namespace Football\FrontendBundle\Exception;

use RuntimeException;

/**
 * Triggered when Country entity related errors occur.
 */
class CountryException extends RuntimeException
{
}

namespace Football\FrontendBundle\Controller;

use Football\FrontendBundle\Exception\CountryException;

class CountryController extends Controller
{
    public function createAction(Request $request)
    {
        // Some process here

        try {
            // Some process here

            $em->persist($country);
            $em->flush();
        } catch (DBALException $e) {
            $message = sprintf('DBALException [%i]: %s', $e->getCode(), $e->getMessage());
        } catch (ORMException $e) {
            $message = sprintf('ORMException [%i]: %s', $e->getCode(), $e->getMessage());
        } catch (Exception $e) {
            $message = sprintf('Exception [%i]: %s', $e->getCode(), $e->getMessage());
        }

        if (isset($message)) {
            throw new CountryException($message);
        }

        return $this->redirect($this->generateUrl('country_create'));
    }
}