huh, was quite surprised to learn that openapi-generator (https://github.com/OpenAPITools/openapi-generator) is still on java version 11.
but on the other hand, would you really benefit from upgrading if your product is not a running service, but literally a library which generates a bunch of text files, and you want their content to be as stable as possible? is not upgrading at all the best tactic in that case?

GitHub - OpenAPITools/openapi-generator: OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3) - OpenAPITools/openapi-gener...