[BUG][JAVA][SPRING] HomeController template ignored

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

It seems that JavaSpring's template for HomeController.java (homeController.mustache) is completely ignored:

• The class' comment is "Home redirection to OpenAPI api documentation" in the template but is "Home redirection to swagger api documentation" in the generated code
• Using the option <documentationProvider>source</documentationProvider> with the maven plugin does nothing
• Using a custom template with the maven plugin (declared in dependencies) changes nothing

openapi-generator version

6.0.0

OpenAPI declaration file content or url

Irrelevant

Generation Details

Any generation with supporting files should show the comment difference.

I'm using the maven plugin with configuration <supportingFilesToGenerate>ApiUtil.java,HomeController.java,openapi.yaml</supportingFilesToGenerate>.

Steps to reproduce

Any generation with supporting files should show the comment difference.

Related issues/PRs

None found

Suggest a fix

Start with modules/openapi-generator/src/main/resources/JavaSpring/homeController.mustache and the JavaSpring supporting-file generation path. Reproduce the Maven plugin configuration using supportingFilesToGenerate, then compare the generated HomeController.java with the template and test custom-template and documentationProvider behavior. Done means the intended template and options affect the generated supporting file.