Annotation for binding a json field to a field in POJO with a different name

Question

Java class (used as a Data Transfer Object):

class Resource also has a field named id with a different type along with its getter and setter, hence the synt

Answer 1

Googled and found this question: Jackson serialization: how to ignore superclass properties. Adapted it for your problem.

public class A extends B {
    private int id;

    public A(int id) {
        super.setId("id" + id);
        this.id = id;
    }

    @Override
    @JsonProperty("_id_")
    public String getId() {
        return super.getId();
    }

    @Override
    @JsonProperty("_id_")
    public void setId(String id) {
        super.setId(id);
    }

    @JsonProperty("id")
    public int getIntId() {
        return id;
    }

    @JsonProperty("id")
    public void setIntId(int id) {
        this.id = id;
    }
}

public class B {
    private String id;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

Tested it with this:

@RestController
public class TestController {
    @GetMapping("/test")
    public A test() {
        return new A(1);
    }
}

And the output was:

{
  "_id_": "id1",
  "id": 1
}

Answer 2

public A extends Resource {
    private int id;

    @JsonProperty("_id")
    public int getId() {
      return id;
    }

    @JsonProperty("id")
    public void setId(int id) {
      this.id = id;
    }
}

the method names should be different, so jackson parses it as different fields, not as one field.