Symfony3 ClassNotFoundException after bundle creat

问题:

I wanted to start a new 3.3 project in Symfony and started as usual:

1.) Creating the new project: symfony new ArtProject

2.) Creating a new Bundle: php app/console generate:bundle (Paul/ArtBundle, yml, src/)

Then I run the local server and when I open 127.0.0.1:8000 I get this beautiful message:

(1/1) ClassNotFoundException

Attempted to load class \"PaulArtBundle\" from namespace \"Paul\\ArtBundle\". Did you forget a \"use\" statement for another namespace? in AppKernel.php (line 19)

Which is strange and I haven\'t figured out why this happen so far. Before creating the Bundle, there was no error; I saw the typical startpage of symfony.

public function registerBundles()
{
    $bundles = [
        new Symfony\\Bundle\\FrameworkBundle\\FrameworkBundle(),
        ......
        new Sensio\\Bundle\\FrameworkExtraBundle\\SensioFrameworkExtraBundle(),
        new AppBundle\\AppBundle(),
        new Paul\\ArtBundle\\PaulArtBundle(),
    ];
}

---

<?php

namespace Paul\\ArtBundle;

use Symfony\\Component\\HttpKernel\\Bundle\\Bundle;

class PaulArtBundle extends Bundle
{
}

Any idea whats going on there? I did not change a thing, I only ran these commands.

回答1:

I just installed a fresh copy of S3.3.4 (latest version as of this writing) using:

composer create-project symfony/framework-standard-edition s334 \"3.3.4\"
bin/console generate:bundle
Share across multiple apps: yes
namespace: Paul\\ArtBundle
bundle name: PaulArtBundle
Target Directory: src/

Refreshed the browser and sure enough I got the class not found message.

The generate:bundle command is not updating the autload section of composer.json when a new namespace is introduced. Edit composer.json and:

# composer.json
\"autoload\": {
    \"psr-4\": {
        \"AppBundle\\\\\": \"src/AppBundle\",
        \"Paul\\\\\": \"src/Paul\"
    },
    \"classmap\": [ \"app/AppKernel.php\", \"app/AppCache.php\" ]
},

Then run

composer dumpautoload

And restart the server(maybe). That should fix the bundle class not found problem.

I have not used the generate:bundle command is quite some time ever since the standard was to put everything under AppBundle so I don\'t know how long this has been \"broken\". But at least three questions in the last week or so indicates it was something recent.

And by the way, when I refreshed the browser I got \"Hello World\" which threw me for a bit. Turns out the new bundle overrides the / route which is also sort of special.

And in case anybody is wondering why this started happening, Symfony 3.2 changed from

#composer.json
\"psr-4\": { \"\": \"src/\" },
To
\"psr-4\": { \"AppBundle\\\\\": \"src/AppBundle\" },

You could always just change it back though I think spelling out individual namespaces might be \"better\". Not sure.

And here is an issue with more details: https://github.com/symfony/symfony-standard/issues/1098

Looks like the maintainer favored a tiny speed improvement over breaking an existing command. Oh well. Symfony Flex is supposed to make everything great again.

回答2:

If you generate a bundle for usage in multiple projects (with own namespace) you need to add it in the composer.json as follwed:

Lets assume your bundle name is CompanyFooBundle with namespace Company\\Bundle\\FooBundle then the composer autoload section should look like:

...
\"autoload\": {
    \"psr-4\": {
        \"Company\\\\Bundle\\\\FooBundle\\\\\": \"src/Company/Bundle/FooBundle\"
    },
    \"classmap\": [
        \"app/AppKernel.php\",
        \"app/AppCache.php\"
    ]
},
...

回答3:

This works for me in:

Generate your Bundle with

./console generate:bundle

And follow the steps as always, now, do what you want in your composer.json file with the line

\"AppBundle\\\\\": \"src/AppBundle\"

Replace with \"\": \"src/\" or add your bundle, for example: \"BackendBundle\\\\\": \"src/BackendBundle\"

Here\'s the new part:

1. Install composer in your bin directory, copy and paste the steps from https://getcomposer.org/download/

2. Up a level in your project directory, and in your root folder (of your project) run the next command

php ./bin/composer.phar update