Jackson Deserialization of Embedded Java Object

Question

I have to deserialize following json using Jackson library into Customer class

{
   "code":"C001",
   "city": "Pune",
   "street": "ABC Road"
}

and Classes as

class Address{
    String city;
    String street;
}

class Customer{
    String code;
    Address address;
}

I have found similar question on stack Java jackson embedded object deserialization

but answer does not apply to my case. Also I only want to use Jackson library.

How can I map this json to Customer object?

Answer 1

You can put a @JsonUnwrapped annotation on the Address field in the customer class. Here is an example:

public class JacksonValue {
    final static String JSON = "{\n"
            +"   \"code\":\"C001\",\n"
            +"   \"city\": \"Pune\",\n"
            +"   \"street\": \"ABC Road\"\n"
            +"}";

    static class Address {
        public String city;
        public String street;

        @Override
        public String toString() {
            return "Address{" +
                    "city='" + city + '\'' +
                    ", street='" + street + '\'' +
                    '}';
        }
    }

    static class Customer {
        public String code;
        @JsonUnwrapped
        public Address address;

        @Override
        public String toString() {
            return "Customer{" +
                    "code='" + code + '\'' +
                    ", address=" + address +
                    '}';
        }
    }


    public static void main(String[] args) throws IOException {
        final ObjectMapper mapper = new ObjectMapper();
        System.out.println(mapper.readValue(JSON, Customer.class));
    }
}

Output:

 Customer{code='C001', address=Address{city='Pune', street='ABC Road'}}