JSON Deserialization issue : Error deserialize JSON value into type

Question

I have a composite object like below:

Map<String, Object> m = new HashMap<>();
m.put("a", "b");
m.put("c", "{\"a\" :3, \"b\" : 5}");

           
m = {a=b, c={"a" :3, "b" : 5}}

I have to submit this request via https call in order to deserialize to a java object, hence i converted this to JSON string, using,

objectmapper.writeValueAsString(m)

when i convert it , it is appending quotes to the value of c:

{"a":"b","c":"{\"a\" :3, \"b\" : 5}"}

and While deserializing this object at the client side, the request fails saying "Error deserialize JSON value into type: class"

Any help??

Answer 1

You better use JSONObject for c value:

JSONObject json = new JSONObject();
json.put("a", 3);
json.put("b", 5);

Map<String, Object> m = new HashMap<>();
m.put("a", "b");
m.put("c", json);

---

Complete code:

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import net.minidev.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

public static void main(String[] args) throws JsonProcessingException {

    JSONObject json = new JSONObject();
    json.put("a", 3);
    json.put("b", 5);

    Map<String, Object> m = new HashMap<>();
    m.put("a", "b");
    m.put("c", json);


    ObjectMapper objectMapper = new ObjectMapper();
    String valueAsString = objectMapper.writeValueAsString(m);

    System.out.println(valueAsString);
}

The output is:

{"a":"b","c":{"a":3,"b":5}}