Microservices API Documentation with Springdoc OpenAPI

I have already written about documentation for microservices more than two years ago in my article Microservices API Documentation with Swagger2. In that case I used project SpringFox for auto-generating Swagger documentation for Spring Boot applications. Since that time the SpringFox library is not being actively developed by the maintainers – the latest version has been released on June 2018. Currently, the most important problems with this library are a lack of support for OpenAPI in the newest version 3, and for Spring reactive APIs built using WebFlux. All these features are implemented by Springdoc OpenAPI library. Therefore, it may threaten as a replacement for SpringFox as Swagger and OpenAPI 3 generation tool for Spring Boot applications.