This showcases a simplistic Spring Boot project with an API-first design pattern.
The rest package provides an implementation of a REST controller that imports API and model files that get generated automatically from the supplied OpenAPI 3 spec file.
Api and model files will be generated before the compileJava task of the Gradle Java plugin. The processResource dependency is to appease Gradle's compile optimisation.
Please run ./gradlew clean build to witness the magic.