Symfony error: Class 'Symfony\Component\HttpKernel\Kernel' not found

Question

After upgrading from Symfony 3.1 to 3.2 I get this error message :

Fatal error: Class 'Symfony\Component\HttpKernel\Kernel' not found in /var/www/html/HeliosBlog/app/AppKernel.php on line 6

Here's what my app/autoload.php looks like:

<?php

use Doctrine\Common\Annotations\AnnotationRegistry;

if (!$loader = @include __DIR__.'/../vendor/autoload.php') {

    $message = <<< EOF

EOF;

    if (PHP_SAPI === 'cli') {
        $message = strip_tags($message);
    }

    die($message);
}

// intl
if (!function_exists('intl_get_error_code')) {
    require_once __DIR__.'/../vendor/symfony/symfony/src/Symfony/Component/Locale/Resources/stubs/functions.php';

    $loader->add('', __DIR__.'/../vendor/symfony/symfony/src/Symfony/Component/Locale/Resources/stubs');
}

AnnotationRegistry::registerLoader(array($loader, 'loadClass'));

return $loader;

Here's what my app_dev.php file looks like:

<?php

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Debug\Debug;

if (isset($_SERVER['HTTP_CLIENT_IP'])
    || isset($_SERVER['HTTP_X_FORWARDED_FOR'])
    || !(in_array(@$_SERVER['REMOTE_ADDR'], array(
            '127.0.0.1',
            'fe80::1', '::1')) || php_sapi_name() === 'cli-server')
) {
    header('HTTP/1.0 403 Forbidden');
    exit('You are not allowed to access this file. Check '.basename(__FILE__).' for more information.');
}

$loader = require __DIR__.'/../app/autoload.php';
Debug::enable();

require_once __DIR__.'/../app/AppKernel.php';

$kernel = new AppKernel('dev', true);
//$kernel->loadClassCache();
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);

And here's what my AppKernel.php looks like:

<?php

use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Config\Loader\LoaderInterface;

class AppKernel extends Kernel
{

    public function registerBundles()
    {
        $bundles = array(
            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
            new Symfony\Bundle\SecurityBundle\SecurityBundle(),
            new Symfony\Bundle\TwigBundle\TwigBundle(),
            new Symfony\Bundle\MonologBundle\MonologBundle(),
            new Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle(),
            new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
            new JMS\AopBundle\JMSAopBundle(),
            new JMS\DiExtraBundle\JMSDiExtraBundle($this),
            new JMS\SecurityExtraBundle\JMSSecurityExtraBundle(),
            new JMS\SerializerBundle\JMSSerializerBundle(),
            new Helios\BlogBundle\HeliosBlogBundle(),
            new Stof\DoctrineExtensionsBundle\StofDoctrineExtensionsBundle(),
            new Helios\UserBundle\HeliosUserBundle(),
            new FOS\UserBundle\FOSUserBundle(),
            new FOS\ElasticaBundle\FOSElasticaBundle(),
            new Knp\Bundle\MarkdownBundle\KnpMarkdownBundle(),
            new Helios\ManagerBundle\HeliosManagerBundle(),
            new FOS\JsRoutingBundle\FOSJsRoutingBundle(),
            //new Avalanche\Bundle\ImagineBundle\AvalancheImagineBundle(),
            new Oneup\UploaderBundle\OneupUploaderBundle(),
            new Gregwar\CaptchaBundle\GregwarCaptchaBundle(),
            new Sonata\AdminBundle\SonataAdminBundle(),
            new Sonata\DoctrineORMAdminBundle\SonataDoctrineORMAdminBundle(),
            new Sonata\BlockBundle\SonataBlockBundle(),
            new Sonata\CoreBundle\SonataCoreBundle(),
            new Knp\Bundle\MenuBundle\KnpMenuBundle(),
            new HWI\Bundle\OAuthBundle\HWIOAuthBundle(),
            new Ivory\CKEditorBundle\IvoryCKEditorBundle(),
        );

        if (in_array($this->getEnvironment(), array('dev', 'test'))) {
            $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
            $bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();
            $bundles[] = new Sensio\Bundle\GeneratorBundle\SensioGeneratorBundle();

            $bundles[] = new Doctrine\Bundle\FixturesBundle\DoctrineFixturesBundle();
            $bundles[] = new CoreSphere\ConsoleBundle\CoreSphereConsoleBundle();
        }

        return $bundles;
    }

    public function registerContainerConfiguration(LoaderInterface $loader)
    {
        $loader->load(__DIR__.'/config/config_'.$this->getEnvironment().'.yml');
    }
}

Already tried removing the vendor folder and doing a composer install.

Any ideas?

looking at the error Kernel and AppKernel, fishy. care to post what does AppKernel contains? — Bagus Tesa
– Bagus Tesa, Commented Dec 27, 2016 at 1:16
Use the standard Symfony autoload.php and get rid of the rest of the nonsense. And while we on the subject, use the standard app_dev.php file as well. — Cerad
– Cerad, Commented Dec 27, 2016 at 3:05
I used the standard autpload.php and app_dev.php files, and deleted the cache folder manually, but nothing has changed. — Nicolas GAUTHIER
– Nicolas GAUTHIER, Commented Dec 27, 2016 at 14:08

leberknecht · Accepted Answer · 2017-05-08 12:31:19Z

14

I was able to solve it by simply adding

require_once __DIR__.'/autoload.php';

to app/console before

require_once __DIR__ . '/AppKernel.php';`

answered May 8, 2017 at 12:31

leberknecht

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2 Comments

Revolucion for Monica Over a year ago

This is a deperecated answer for Symfony 3, isn't it ?

leberknecht Over a year ago

Hm, possible, yes. I ran into this when updating from 2.8 to 3.1 (with keeping the console script in app/console-directory). But i would not say that it is "deprecated", as the base-take-away "ensure that you have autoload included before including the kernel" is still valid (even though that should indeed already be the case if you install symfony from scratch).

Rico Humme · Accepted Answer · 2016-12-27 21:14:44Z

4

Ran into the same error. Found that the bootstrap.php.cache was unaware of the Kernel class. This happened due the Sensio Distibution bundle having an update. For this I posted an issue which can be found here: https://github.com/sensiolabs/SensioDistributionBundle/issues/302

I hope this helps others as well.

answered Dec 27, 2016 at 21:14

Rico Humme

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2 Comments

Cerad Over a year ago

That seems unlikely. The bootstrap cache file preloads certain classes for performance reasons. All other classes will still be autoloaded as needed. I suspect he has version issues resulting in an empty vendor directory.

Nicolas GAUTHIER Over a year ago

Downgraded the Sensio Distribution bundle from 5.0.15 to 5.0.14, and the error is indeed gone. Hope this will be fixed soon.

Community · Accepted Answer · 2017-05-23 12:26:34Z

3

I had this issue while running composer update, because it was still using app/console (probably outdated) instead of the new bin/console.

I fixed this issue by:

removing app/console file.
creating a var/ folder in my project root directory - see this answer for explanation.

edited May 23, 2017 at 12:26

CommunityBot

11 silver badge

answered Apr 13, 2017 at 14:35

Arthur

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Comments

dinel · Accepted Answer · 2017-01-25 00:40:26Z

2

I run into this problem as well while updating my project from Symfony 2.x (can't remember whether it was 2.7 or 2.8) to 3.2. In turn out that the problem was caused by the app/console file. I believe the problem is caused by the way I created the project ages ago.

To solve this problem, I copied the app/console file from another project which I successfully upgraded to 3.2. I am not sure whether there will be some other problems down the line, but at least I got rid of this error.

The discussion that prompted me to make this change is https://github.com/symfony/symfony/issues/16713

answered Jan 25, 2017 at 0:40

dinel

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