Documentation states that exposing a model to OpenAPI without any routes can use non-existing controllers

[derTuca]

In this section, the following is written:
This way, we expose a route that will do… nothing. Note that the controller does not even need to exist.

However, if a non-existing controller is used, Symfony returns the following error:

Operation "_api_/entity_name{._format}_get" is defining an unknown service as controller "App\Entity\NonExistingControllerForOpenApi". Make sure it is properly registered in the dependency injection container in . (which is being imported from "/app/config/routes/api_platform.yaml"). Make sure there is a loader supporting the "api_platform" type.

Creating an empty AbstractController and referencing that fixes the issue.