Java EE 8 standards don't define any documentation standards, but this gap is filled by a popular choice called Swagger. As described on the swagger.io home page, it is an API tooling solution.
Swagger is the world's largest framework of API developer tools for the OpenAPI Specification (OAS), enabling development across the entire API lifecycle, from design and documentation, to testing and deployment.
This API tool allows for REST API documentation that stays closer to the code and evolves along with it. As an API framework, Swagger allows us to use annotations on the resource classes and its resource methods. Swagger has a lot to offer, and many features that are beyond the scope of this short brief. Developers should explore it further on its site.
The basic idea is to document the code with enough metadata in the form of annotations and then use build tools...