为什么科哈纳找不到我的控制器?

我有以下控制器:

<?php defined('SYSPATH') or die('No direct script access.');

class Controller_Static extends Controller_DefaultTemplate {

    public function action_index()
    {
        View::set_global('message', '<span class="highlight">This is a global message.</span>');

        $data = array (
            'siteTitle' => 'Kohana Test Site',
            'siteSubtitle' => 'A site to learn Kohana',
            'menu' => View::factory('blocks/menu'),
        );

        $view = View::factory('templates/layout', $data);
        $this->request->response = $view->render();
    }

} 

ErrorException[致命错误]:类 找不到“Controller\u DefaultTemplate”

尽管Eclipse可以找到这个文件(通过F3),而且我认为Kohana可以通过自动加载找到所有类?