Lombok: RequiredArgsConstructor not working

Question

It seems that @RequiredArgsConstructor not working in the code below. Why is it?

import java.io.Serializable;

import lombok.Data;
import lombok         


        

Answer 1

The argument fields for @RequiredArgsConstructor annotation has to be final. So this fix will work:

private final String username;

The IDE IntelliJ makes the variable grey (inactive status) when final keyword missed, which is very helpful to detect this kind of mistake.