Symfony2 : Custom Exception Listener not working on production env

Question

我已经做了一些自定义异常监听器，因此在表中的数据库中，我得到了旧的 url，现在是 404 错误，以及用户在到达旧 url 时应重定向到的另一个 url。问题是，在 DEV 环境中一切正常，但在 PROD 环境中运行时遇到问题(它抛出 503 服务不可用错误)。

有人知道可能出了什么问题吗？

服务.yml:

services:
    coupons.exception.action_listener:
        class: Coupons\WebBundle\EventListener\ExceptionListener
        arguments: [@service_container, @templating]
        tags:
            -   { name: kernel.event_listener, event: kernel.exception, method: onKernelException }

异常监听器:

namespace Coupons\WebBundle\EventListener;

use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Bundle\TwigBundle\TwigEngine;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;

class ExceptionListener
{
    /**
     * @var ContainerInterface
     */
    protected $container;

    /**
     * @var TwigEngine
     */
    protected $templating;


    /**
     * @param ContainerInterface $container
     */
    public function __construct(ContainerInterface $container, TwigEngine $templating){
        // assign value(s)
        $this->container = $container;
        $this->templating = $templating;
    }

    /**
     *
     * @param GetResponseForExceptionEvent $event
     */
    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        // get exception
        $exception = $event->getException();

        // get path
        $path = $event->getRequest()->getPathInfo();
        $url = $event->getRequest()->getUri();

        $repository = $this->container->get('doctrine')->getRepository('CouponsWebBundle:SeoNotFound');


        $seonotfound = $repository->createQueryBuilder('s')
            ->where('s.urlFrom LIKE :url')
            ->andWhere('s.status = 1')
            ->setParameter('url', $url.'%')
            ->getQuery()
            ->getOneOrNullResult(); 

        if($seonotfound != NULL){
            $event->setResponse(new RedirectResponse($seonotfound->getUrlTo(),$seonotfound->getRedirectType()));
        }

    }
}

Answer 1

可能您在异常监听器中遇到了另一个异常，请检查 symfony 的日志文件。