Validation errors are always empty in Laravel 9.x-dev

[robinheidrich]

• Laravel Version: 9.x-dev
• PHP Version: 8.1.2
• Database Driver & Version: MariaDB 10.6.5

Description:

Since I upgraded to Laravel 9, validation errors are no longer displayed.

The output of dd($errors) always returns an empty array, even if there definitely should be an error.

Illuminate\Support\ViewErrorBag {[#289 ▼]()
  #bags: []
}

I tested if this is definitely an error in Laravel 9 and when downgrading back to Laravel 8 the errors were displayed again.

No idea what the reason is.

Steps To Reproduce:

• Use a validation in the controller
• Output the content of $errors in the view

In Laravel 8 the error is displayed, in Laravel 9 it is not.

[liviusirbulescu]

This is due to the new Session Serialization Strategy in 9.x (introduced in beta 4). Errors are empty only when serialization is set to 'json' in config/session.php (current default), either comment or update 'serialization' => 'php' as a temporary workaround.

[chuckrincon]

For more information about this change: [9.x] JSON Session Option

[driesvints]

I've sent in a PR to revert this. Thanks.