Why is Lombok @Builder not compatible with this constructor?

Question

I have this simple code:

@Data
@Builder
public class RegistrationInfo {

    private String mail;
    private String password;

    public RegistrationInfo(RegistrationInfo registrationInfo) {
        this.mail = registrationInfo.mail;
        this.password = registrationInfo.password;
    }
}

First I was using only the @Builder Lombok annotation and everything was fine. But I added the constructor and the code does not compile any more. The error is:

Error:(2, 1) java: constructor RegistrationInfo in class com.user.RegistrationInfo cannot be applied to given types;
  required: com.user.RegistrationInfo
  found: java.lang.String,java.lang.String
  reason: actual and formal argument lists differ in length  

So I have two questions:

1. Why is Lombok @Builder not compatible with this constructor?
2. How do I make the code compile taking into account that I need both the builder and the constructor?

Answer 1

You can either add an @AllArgsConstructor annotation, because

@Builder generates an all-args constructor iff there are no other constructors defined.

(Quotting @Andrew Tobilko)

Or set an attribute to @Builder : @Builder(toBuilder = true) This gives you the functionality of a copy constructor.

@Builder(toBuilder = true)
class Foo {
    // fields, etc
}

Foo foo = getReferenceToFooInstance();
Foo copy = foo.toBuilder().build();