Autentizacia – zaciatocnicka otazka

Zdravim,

mam pomerne elementarny dotaz. Podla navodu som vytvoril extremne jednoduchy skript na autentizaciu, ktory funguje pokial zadam spravne meno a heslo, ale v momente ak to heslo zadam ine, tak sa absolutne nic nevykona ani nevypise. Co nerobim spravne?

Vdaka

<?php

require "Nette/loader.php";

class MyAuthenticator extends Object implements IAuthenticator
{
        public function authenticate(array $credentials)
        {
                $username = $credentials[self::USERNAME];
                $password = $credentials[self::PASSWORD];

                if ($password == "heslo"){
                return new Identity("User name");
                } else {
                throw new AuthenticationException("Invalid password.");
                }
        }
}

$user = Environment::getUser();
$user->setAuthenticationHandler(new MyAuthenticator);

try{
        $user->authenticate("user","heslo");
        echo $user->getIdentity()->getName();
} catch (AuthenticationException $e) {
        echo 'Chyba: ', $e->getMessage();
}

?>