Polymorphism in Jackson

@Getter
@Setter
@JsonIgnoreProperties
public class MyRequestDTO{
@NotNull
private Device device; //Composition
}
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.WRAPPER_OBJECT)
@JsonSubTypes({ @JsonSubTypes.Type(value = Mobil.class, name = "mobil"),
@JsonSubTypes.Type(value = Laptop.class, name = "laptop") })
public interface Device{
public String result();
}
@Getter
@Setter
@JsonTypeName("mobil")
@JsonIgnoreProperties
public class Mobil implements Device{
 private boolean mobilFieldName;
@Override
 public String result() {
  return this.getMobilFieldName();
 }
}
@Getter
@Setter
@JsonTypeName("laptop")
@JsonIgnoreProperties
public class Laptop implements Device{
 private String laptopFieldName;
@Override
 public String result() {
  return this.getLaptopFieldName();
 }
}

Json Example -1:

{
    "device": {
        "mobil": {
           "mobilFieldName": true
       }
    }
}

JSON Example -2

{
    "device": {
        "laptop": {
           "laptopFieldName": "my laptop details"
       }
    }
}

How to use…

1- To access Mobil/Laptop object fields
if (myRequestDTO.getDevice() instanceof Mobil) {
Mobil mobil= (Mobil) myRequestDTO.getDevice();
mobil.getMobilFieldName();
}else if (myRequestDTO.getDevice() instanceof Laptop) {
Laptop laptop= (Laptop) myRequestDTO.getDevice();
laptop.getLaptopFieldName();
}
2- To access common methods...
myRequestDTO.getDevice().getResult();

good luck…