How can I deserialize JSON to a Map member variable using Jackson?

Question

I have some JSON I would like to map to my Boxobject:

  {
      \"created_date\": \"2015-11-11\",
      \"generation_date\": \"2015-11-12T20:35:         


        

Answer 1

I think you need to add an annotated argument to your constructor. For example,

public Box(@JsonProperty("json") Map<String, Object> json) {
    // TODO
}

Answer 2

First, addressing your problem. You are trying to de-serialize JSON to a class that doesn't have fields present in the JSON string, so it's failing to find those fields and returning the exception.

You could alternatively do the following:

ObjectMapper mapper = new ObjectMapper();
Map<String, Object> map = mapper.readValue(JSON_STRING, new TypeReference<Map<String, String>>(){});
box.setJsonMap(map);

where box would have a setter to set the json map

Or you could add all the fields to your Box POJO and use GSON to make this easier!

E.g. Json -> Object

Gson gson = new Gson();
Box box = gson.fromJson(JSON_STRING, Box.class);

E.g. Object -> Json

Gson gson = new Gson();
String str = gson.toJson(mBox); //mBox is some box object

GSON would populate all the fields within box to match the key, value pairs found in the JSON string. Ignore this if you don't want to do that but it is another alternative!