Make jackson deserialize objects with the support of polymorphism

jackson-deserialization-polymorphism.java

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property = "@type")
abstract class Parent {
    private int id;
}

@Data
class ChildOne extends Parent {}

@Data
class ChildTwo extends Parent {}

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
class JsonDto<T extends Parent> {
    private T content;
}

class Scratch {
    public static void main(String[] args) {
        JsonDto dto = JsonDto.builder()
                .content(new ChildTwo())
                .build();

        ObjectMapper objectMapper = new ObjectMapper();

        try {
            String json = objectMapper.writeValueAsString(dto);
            System.out.println(json);

            JsonDto deserialized = objectMapper.readValue(json, JsonDto.class);
            System.out.println("Deserialized Json Class: " + deserialized.getClass().getSimpleName());
            String deserializedJson = objectMapper.writeValueAsString(deserialized);
            System.out.println(deserializedJson);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}