Lombok @Builder inheritance workaround

Question

Lombok @Builder doesn't work for inheritance use cases:

For example

class Foo{
 protected int xyz1;
 .....
 protected String xyz7;
}


class Bar extends Foo{

}

For given use case Lombok will not be able to generate methods to set value of parameter defined in Foo class.

A workaround for this is:

Manual creating constructor of Bar.
Putting a Builder annotation on that constructor.

Is there a better workaround ?

In my opinion this is a fine solution. How would you imagine it should work? — Jeff, Nov 06 '15 at 16:45

score 52 · Answer 1 · answered Aug 07 '18 at 14:14

52

Lombok has introduced experimental features with version: 1.18.2 for inheritance issues faced with Builder annotation, and can be resolved with @SuperBuilder annotation as below.

@SuperBuilder
public class ParentClass {
    private final String a;
    private final String b;
}

@SuperBuilder
public class ChildClass extends ParentClass{
    private final String c;
}

Now, one can use Builder class as below (that was not possible with @Builder annotation)

ChildClass.builder().a("testA").b("testB").c("testC").build();

answered Aug 07 '18 at 14:14

Amit Kaneria

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Idea 2018.1 shows error in editor, but build and run is OK. – Leon Sep 08 '18 at 03:24
3

Perfect! And works with more than one layer of inheritance. Thank you! – djsmith Dec 09 '19 at 23:13
this doesn't work for me using lombok 1.18.20 I foud this alternative https://blog.knoldus.com/how-to-deal-with-inheritance-while-using-lombok-builder/ – ahmed.ettoumi Mar 18 '22 at 10:34

fd8s0 · Answer 2 · 2019-12-12T10:25:22.643

20

I leave this here for reference, as other answers demonstrate there is now (not at the time this answer was posted) a @SuperBuilder feature available now in the library which seems more fitting.

It´s a bit hidden, but people have had this question before, see:

https://reinhard.codes/2015/09/16/lomboks-builder-annotation-and-inheritance/

To summarise the blog post

@AllArgsConstructor
public class Parent {
  private String a;
}

public class Child extends Parent {

  private String b;

  @Builder
  private Child(String a, String b){
    super(a);
    this.b = b;
  }
}

Would allow you to use

Child.builder().a("testA").b("testB").build()

edited Dec 12 '19 at 10:25

answered Apr 07 '16 at 17:00

fd8s0

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well don't blame me! that's as much support as there is unless somebody improves the library – fd8s0 Jan 19 '17 at 16:34
I couldn't get this to work with more than one layer of inheritance. But @Anamika's answer with `@SuperBuilder` worked for me. – djsmith Dec 09 '19 at 23:14
I moved my edit comment to the top of the answer, this answer is older than the @SuperBuilder feature. – fd8s0 Dec 12 '19 at 10:26

score 0 · Answer 3 · answered May 03 '18 at 08:16

0

There is a solution to this problem currently in the works. Check the progress here: https://github.com/rzwitserloot/lombok/pull/1337

answered May 03 '18 at 08:16

Jacques Koorts

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Lombok @Builder inheritance workaround

3 Answers3

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