Symfony 3.3 ClassNotFoundException After Bundle Creation: How to Fix the Autoload Issue?

Symfony 3: Troubleshooting ClassNotFoundException after Bundle Creation

Creating a new bundle in Symfony 3.3 can sometimes lead to a "ClassNotFoundException" error. This puzzling issue occurs after performing the following steps:

1. Generate a new project using "symfony new ArtProject"
2. Create a new bundle using "php app/console generate:bundle (Paul/ArtBundle, yml, src/)"

When attempting to access "127.0.0.1:8000," the error message is displayed.

Understanding the Issue

The error occurs because the "generate:bundle" command fails to update the "autoload" section of "composer.json" when a new namespace is introduced. This results in the failure to load the created bundle's class properly.

Resolution

To resolve the issue, manually edit "composer.json" and add the following line:

"psr-4": {
    "AppBundle\": "src/AppBundle",
    "Paul\": "src/Paul"
}

Next, run "composer dumpautoload" and restart the server.

Background

In Symfony 3.2, the "autoload" configuration automatically searched for all PHP classes in the "src/" directory. However, in Symfony 3.3, this configuration has changed to explicitly include namespaces. As a result, the "generate:bundle" command no longer updates the "autoload" section, leading to the class not found error.

Conclusion

This issue can be easily resolved by manually updating the "composer.json" file and running "composer dumpautoload." Remember that this issue is due to the change in the "autoload" configuration in Symfony 3.3.

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