Symfony 3: Why Get a ClassNotFoundException After Generating a Bundle with a Custom Namespace?

Symfony3 Class Not Found Exception After Bundle Creation

When creating a new bundle in Symfony3 using the generate:bundle command, you may encounter a ClassNotFoundException for the newly created bundle. This issue arises specifically when a custom namespace is introduced during bundle creation.

The root cause lies in the fact that the generate:bundle command neglects to update the autoload section of composer.json to include the new namespace. Consequently, the autoloader is unable to locate the bundle class when the server is restarted.

To resolve this issue, manually edit composer.json and add the following code within the psr-4 section:

"Paul\": "src/Paul"

This informs the autoloader where to find the Paul namespace in the src directory.

Once composer.json has been updated, run the following commands to refresh the autoloader and restart the server (if necessary):

composer dumpautoload

After these steps, the ClassNotFoundException should be resolved, and the bundle can be accessed as expected.

Additional Points:

• This issue began occurring after Symfony 3.2 changed the default psr-4 namespace mapping from "" to AppBundle\.
• If desired, you can revert to the old namespace mapping by modifying composer.json.
• For more detailed information, refer to the GitHub issue: https://github.com/symfony/symfony-standard/issues/1098

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