http://forumsarchive.laravel.io/viewtopic.php?pid=56623

class MySessionHandlerServiceProvider extends \Illuminate\Support\ServiceProvider {
// Make shure that this service provider always boots
    protected $defer = false;


    public function register()
    {
        /*Session::extend('mysessionhandler', function($app)
        {
            return new MySessionHandler;
        });*/
        Session::extend('mysessionhandler', function($app)
        {
            return new MySessionHandler;
        });
    }
}

There are mistakes Symfony \ Component \ Debug \ Exception \ FatalErrorException Call to undefined method Illuminate\Support\Facades\Session::extend()