不是一个有效的实体或映射类

我使用Doctrine与Codeigniter。所以我写了一个库类来一起使用它们。但我不能访问实体(从数据库与逆向工程创建它们后)。致命错误:未捕获异常'Doctrine'ORM'Mapping'MappingException'伴有消息'Class Actions不是有效实体或映射的超类。'

我只是将这段代码添加到库类中，一切正常，但是速度非常低:

    $this->em->getConfiguration()
             ->setMetadataDriverImpl(
                new DatabaseDriver(
                        $this->em->getConnection()->getSchemaManager()
                )
    );

我该怎么做这个错误?我使用以下函数从DB生成实体:

    $cmf = new DisconnectedClassMetadataFactory();
    $cmf->setEntityManager($this->em);
    $metadata = $cmf->getAllMetadata();
    $generator = new EntityGenerator();
    $generator->setUpdateEntityIfExists(true);
    $generator->setGenerateStubMethods(true);
    $generator->setGenerateAnnotations(true);
    $generator->generate($metadata, APPPATH."models/entities");

My Action实体:

<?php

/**
 * Actions
 *
 * @Table(name="actions")
 * @Entity
 */
class Actions
{
    /**
     * @var integer $id
     *
     * @Column(name="id", type="integer", nullable=false)
     * @Id
     * @GeneratedValue(strategy="IDENTITY")
     */
    private $id;
    /**
     * @var string $name
     *
     * @Column(name="name", type="string", length=45, nullable=false)
     */
    public $name;
    /**
     * @var string $nameSafe
     *
     * @Column(name="name_safe", type="string", length=45, nullable=false)
     */
    public $nameSafe;

    /**
     * Get id
     *
     * @return integer $id
     */
    public function getId()
    {
        return $this->id;
    }
    /**
     * Set name
     *
     * @param string $name
     */
    public function setName($name)
    {
        $this->name = $name;
    }
    /**
     * Get name
     *
     * @return string $name
     */
    public function getName()
    {
        return $this->name;
    }
    /**
     * Set nameSafe
     *
     * @param string $nameSafe
     */
    public function setNameSafe($nameSafe)
    {
        $this->nameSafe = $nameSafe;
    }
    /**
     * Get nameSafe
     *
     * @return string $nameSafe
     */
    public function getNameSafe()
    {
        return $this->nameSafe;
    }
} 

(编辑)My Library Code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
use Doctrine'Common'ClassLoader,
    Doctrine'ORM'Configuration,
    Doctrine'ORM'EntityManager,
    Doctrine'Common'Cache'ArrayCache,
    Doctrine'DBAL'Logging'EchoSQLLogger,
    Doctrine'ORM'Mapping'Driver'DatabaseDriver,
    Doctrine'ORM'Tools'DisconnectedClassMetadataFactory,
    Doctrine'ORM'Tools'EntityGenerator;
    /**
     * CodeIgniter Doctrine Class
     *
     * initializes basic doctrine settings and act as doctrine object
     *
     * @author  Mehmet Aydın Bahadır
     * @link    http://www.biberltd.com/
     */
    class Doctrine {
          /**
           * @var EntityManager $em
           */
            public $em = null;
          /**
           * constructor
           */
          public function __construct()
          {
            // load database configuration from CodeIgniter
            require APPPATH.'config/database.php';
            // Set up class loading. You could use different autoloaders, provided by your favorite framework,
            // if you want to.
            require_once APPPATH.'third_party/Doctrine/Common/ClassLoader.php';
            $doctrineClassLoader = new ClassLoader('Doctrine',  APPPATH.'third_party');
            $doctrineClassLoader->register();
            $entitiesClassLoader = new ClassLoader('models', rtrim(APPPATH, "/" ));
            $entitiesClassLoader->register();
            $proxiesClassLoader = new ClassLoader('proxies', APPPATH.'models');
            $proxiesClassLoader->register();
            // Set up caches
            $config = new Configuration;
            $cache = new ArrayCache;
            $config->setMetadataCacheImpl($cache);
            $driverImpl = $config->newDefaultAnnotationDriver(array(APPPATH.'models/entities'));
            $config->setMetadataDriverImpl($driverImpl);
            $config->setQueryCacheImpl($cache);
            // Proxy configuration
            $config->setProxyDir(APPPATH.'models/proxies');
            $config->setProxyNamespace('Proxies');
            // Set up logger
            //$logger = new EchoSQLLogger;
            //$config->setSQLLogger($logger);
            $config->setAutoGenerateProxyClasses( TRUE );
            // Database connection information
            $connectionOptions = array(
                'driver' => 'pdo_mysql',
                'user' =>     $db['default']['username'],
                'password' => $db['default']['password'],
                'host' =>     $db['default']['hostname'],
                'dbname' =>   $db['default']['database']
            );
            // Create EntityManager
            $this->em = EntityManager::create($connectionOptions, $config);
//          $this->generate_classes();
          }
          /**
           * generate entity objects automatically from mysql db tables
           * @return none
           */
          public function generate_classes(){     
//            $this->em->getConfiguration()
//                     ->setMetadataDriverImpl(
//                        new DatabaseDriver(
//                                $this->em->getConnection()->getSchemaManager()
//                        )
//            );
            $cmf = new DisconnectedClassMetadataFactory();
            $cmf->setEntityManager($this->em);
            $metadata = $cmf->getAllMetadata();
            $generator = new EntityGenerator();
            $generator->setUpdateEntityIfExists(true);
            $generator->setGenerateStubMethods(true);
            $generator->setGenerateAnnotations(true);
            $generator->generate($metadata, APPPATH."models/entities");
          }
    }
?>