How to add setter to Class using Lombok @Value

Question

@Value
@Builder
public class XXX {
    String field1;
    String field2;
    String field3;
}

I have a class using lombok @Value as above, where each field will be made private and final. Now, I'd like to have a setter for field3, which does not work because field3 is final. What should I do here?

Answer 1

I used @NonFinal and @Setter to achieve this without adjusting too much and staying in the lombok workflow.

I had a large model that I didn't want to refactor to have final variables on everything, so this was the simplest and cleanest solution for me.

@Value
@Builder
public class XXX {
    String field1;
    String field2;

    @NonFinal
    @Setter
    String field3;
}

Answer 2

Don't use @Value then. @Value is for value classes, i.e., classes whose instances are immutable. If you want a field to be mutable, then you clearly don't have a value class.

Instead, make all other fields final manually. Then use @Getter and @RequiredArgsConstructor (and @EqualsAndHashCode if required) on the class, and @Setter on all non-final fields. (Or use @Data, but carefully read its documentation.)