Jackson Default Typing for object containing a field of Map

Question

So I\'ve been trying to get Jackson to serialize/deserialize one object I have which is essentially of the structure:

MyObject {
    String a;
    Map

        

Answer 1

Hi there man please do this to solve your problem

first create a class MyObject with the appropriate getter and setter methods.

/**
 * @author qualebs
 */
public class MyObject {
    private String a;
    private Map<String, Object> map;

    public String getA() {
        return a;
    }

    public void setA(String a) {
        this.a = a;
    }

    public Map<String, Object> getMap() {
        return map;
    }

    public void setMap(Map<String, Object> map) {
        this.map = map;
    }
}

then create an instance of your ObjectMapper with the following Configuration in the class where you are serializing MyObject.

ObjectMapper mapper = new ObjectMapper().configure(FAIL_ON_UNKNOWN_PROPERTIES, false)
        .enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

// get an create a new MyObject
MyObject object = new MyObject();

// set the values you want ie the String a and the Map
Map<String, Object> map = new HashMap<String, Object>();
map.put("string", "example string");
map.put("int", 1);
map.put("long", 1l);
map.put("double", 2.0);
// we can also put an array
map.put("intArray", new int[]{1, 2, 3, 10});

// add the map to your object
object.setMap(map);

// set the string a
object.setA("example String 2");

// now we serialize the object
String mySerializedObj = mapper.writeValueAsString(object);

// to deserialize simply do
MyObject myUnserializedObj = mapper.readValue(mySerializedObj, MyObject.class);

please if this answers your questions accept my answer I could use the points. thank you.