Do Lombok Builders use Reflection?

Question

Do Lombok Builders use Reflection?

or does it also add the necessary code pre-compile?

Answer 1

There's definitely no reflection at all as Lombok uses sort of code generation. It works on the AST (Abstract Syntax Tree) level, i.e., it works with the parsed source, somewhere between the source code and the bytecode.

A part of Lombok is delombok, which shows you rather exactly what code was generated.