Use custom setter in Lombok's builder

Question

I have a custom setter in my Lombok-based POJO:

@Data @Builder public class User {     private static final PasswordEncoder ENCODER = new BCryptPasswordEncoder();      private String password = null;      public void setPassword(String password) {         Assert.notNull(password);         this.password = ENCODER.encode(password);     } 

but when I use the Lombok generated builder:

User user = User.builder()     .password(password)     .build(); 

my custom setter is not invoked, and so the password is not encoded. This makes me sad.

My custom setter is, of course, invoked when I use it directly:

public void changePassword(String password, User user) {     user.setPassword(password); } 

What can I do to have Lombok's builder use my custom setter?

Answer 1

Per the documentation for @Builder: Just define enough skeleton yourself. In particular, Lombok will generate a class UserBuilder, fields mirroring the User fields, and builder methods, and you can provide any or all of this yourself.

@Builder public class User {     private static final PasswordEncoder ENCODER = new BCryptPasswordEncoder();      private String username;      private String password;      public static class UserBuilder {         public UserBuilder password(String password) {             this.password = ENCODER.encode(password);             return this;         }     } } 

Answer 2

I've accepted chrylis's answer but for completeness, here's are some ways to minimize customization and duplication.

Custom setter and builder with static helper

A static helper can be used to shares most of the set password functionality across the custom User.UserBuilder::password method and the custom User::setPassword method:

@Data @Builder public class User {     private static final PasswordEncoder ENCODER = new BCryptPasswordEncoder();      private String password = null;      public void setPassword(String password) {         this.password = _encodePassword(password);     }      public static class UserBuilder {         public UserBuilder password(String password) {             this.password = _encodePassword(password)             return this;         }     }      private static String _encodePassword(String password) {         Assert.notNull(password);         return ENCODER.encode(password);     } } 

Custom setter and constructor

A custom constructor can use User::setPassword which is invoked by the Lombok generated User.UserBuilder::build():

@Data @Builder public class User {     private static final PasswordEncoder ENCODER = new BCryptPasswordEncoder();      private String password = null;      User(String password) {         setPassword(password);     }      public void setPassword(String password) {         Assert.notNull(password);         this.password = ENCODER.encode(password);     } } 

Custom setter and constructor with static helper

Or, a little more elegantly, with a custom constructor and a static helper method:

@Data @Builder public class User {     private static final PasswordEncoder ENCODER = new BCryptPasswordEncoder();      private String password = null;      User(String password) {         _encodePassword(password, this);     }      public void setPassword(String password) {         _encodePassword(password, this);     }      private static _encodePassword(String password, User user) {         Assert.notNull(password);         user.password = ENCODER.encode(password);     } }