{"Key1":"Value1","Key2":{"innerJSonKey":"innerJSonValue"}} this is the jsonobject which is converted to String using toString().
**JSON Simple**
JSONParser jp = new JSONParser();
JSONObject jo = (JSONObject)jp.parse(jsonString);
JSONObject innerjson = (JSONObject)jo.get("innerJSonKey"); -- this pretty much works

ObjectMapper mapper = new ObjectMapper();
JSONObject jo = mapper.readValue(jsonString,JSONObject.class);
JSONObject innerjson = (JSONObject)jo.get("innerJSonKey"); -- **But this step is failing**