The task of creating a custom Java-based REST endpoint is advanced.

When providing the "full CRUD" cycle (create, update, delete) - offering GET, POST, PUT and DELETE methods, one must write a bunch of Java classes. (Actually, it already needs a lot of stuff just for GET).

The concept for such a doc page should provide first
A minimal version which gives guide lines and "all required" important things to know - without delivering a fully fledged tutorial explaining a detailed example.

The output of the doc must be clearly helpful for its audience.