Introduction

This repository was created to showcase a bug in doctrine/doctrine-bundle.

Installation

• Clone the repository to your local machine
  • You need to have PHP8 installed
• Run composer install
• Run bin/console cache:clear --env=prod

Expected behaviour

// Clearing the cache for the prod environment with debug true
                                                                                                                    
[OK] Cache for the "prod" environment (debug=true) was successfully cleared.  

Actual behaviour

In DoctrineMetadataCacheWarmer.php line 49:

  DoctrineMetadataCacheWarmer must load metadata first, check priority of your warmers.

Cause

TableSubscriber is assigned to connection A. In it's constructor it is requiring a repository which uses an entity from connection Z.
When the cache is warmed for connection A the subscriber is initialized and with it the repository which will load the entity manager of an entity from connection Z.
Doctrine will generate metadata for this entity. When connection Z is then warmed metadata for this one entity is already present which throws the exception