@JsonSetter(nulls = Nulls.SKIP) isn't respected in Jackson 3

[Rane43]

ObjectMapper in Jackson 3 doesn't respect @JsonSetter(nulls = Nulls.SKIP) while ObjectMapper in Jackson 2 did.
Example:

package com.example.demo;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonSetter;
import com.fasterxml.jackson.annotation.Nulls;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.ToString;

// @JsonSetter(nulls = Nulls.SKIP) is used to provide default values when fields are null or empty
@Getter
@ToString
@NoArgsConstructor
@AllArgsConstructor
@JsonIgnoreProperties(ignoreUnknown = true)
public class UserJsonSetter {

    @JsonSetter(nulls = Nulls.SKIP)
    private Long id = 0L;
    
    @JsonSetter(nulls = Nulls.SKIP)
    private String username = "guest";
    
    @JsonSetter(nulls = Nulls.SKIP)
    private String email = "";
    
    @JsonSetter(nulls = Nulls.SKIP)
    private String password = "";
    
    @JsonSetter(nulls = Nulls.SKIP)
    private Boolean enabled = false;
}

public static void main(String[] args) throws Exception {
        String json = """
            {
                "id": 1,
                "email": "john@example.com",
                "password": "secret123",
                "enabled": true,
                "address": "11 Fakelands 12"
            }
            """;

        com.fasterxml.jackson.databind.ObjectMapper jackson2Mapper = new com.fasterxml.jackson.databind.ObjectMapper();
        tools.jackson.databind.ObjectMapper jackson3Mapper = new tools.jackson.databind.ObjectMapper();

        System.out.println("1. Jackson 2 -> UserJsonSetter: " + jackson2Mapper.readValue(json, UserJsonSetter.class));
        System.out.println("2. Jackson 3 -> UserJsonSetter: " + jackson3Mapper.readValue(json, UserJsonSetter.class));
}

Result:

1. Jackson 2 -> UserJsonSetter: UserJsonSetter(id=1, username=guest, email=john@example.com, password=secret123, enabled=true)
2. Jackson 3 -> UserJsonSetter: UserJsonSetter(id=1, username=null, email=john@example.com, password=secret123, enabled=true)

(username is set to null even though it should have default value 'guest').

Is this expected behaviour now in Jackson 3?

[cowtowncoder]

Please remove Lombok from reproduction; we cannot have tests with it (can de-Lombokify).
Also: please use assertions and NOT print statements to indicate what is unexpected (I dislike "see output to see the problem" because it is very vague).

Going forward feel free to directly file issue on jackson-databind instead of discussion.

[Rane43]

My bad! I will file issue on jackson-databind in the future. I was able to find the related issue over there: Jackson 3 chooses all-args constructor instead of no-args for POJO with field defaults (behavior change vs 2.x)

This change in Jackson 3 appears to be caused by preference for All Args Constructor over No Args Constructor in Jackson 3 now.