Required arguments with a Lombok @Builder

Question

If I add @Builder to a class. The builder method is created.

Person.builder().name("john").surname("Smith").build(); 

I have a requirement where a particular field is required. In this case, the name field is required but the surname is not. Ideally, I would like to declare it like so.

Person.builder("john").surname("Smith").build() 

I can't work out how to do this. I have tried adding the @Builder to a constructor but it didn't work.

@Builder public Person(String name) {     this.name = name; } 

Answer 1

You can do it easily with Lombok annotation configuration

import lombok.Builder; import lombok.ToString;  @Builder(builderMethodName = "hiddenBuilder") @ToString public class Person {      private String name;     private String surname;      public static PersonBuilder builder(String name) {         return hiddenBuilder().name(name);     } } 

And then use it like that

Person p = Person.builder("Name").surname("Surname").build(); System.out.println(p); 

Of course @ToString is optional here.