Generic JSON Object Parsing or Unknwon JSON Object parsing using Gson librarry

public class JsonParsing {

    static JsonParser parser = new JsonParser();
    public static HashMap<String, Object> createHashMapFromJsonString(String json) {

        JsonObject object = (JsonObject) parser.parse(json);        

        Set<Map.Entry<String, JsonElement>> set = object.entrySet();        

        Iterator<Map.Entry<String, JsonElement>> iterator = set.iterator();        

        HashMap<String, Object> map = new HashMap<String, Object>();
        while (iterator.hasNext()) {

            Map.Entry<String, JsonElement> entry = iterator.next();            

            String key = entry.getKey();            

            JsonElement value = entry.getValue();
            if (null != value) {
                if (!value.isJsonPrimitive()) {
                    if (value.isJsonObject()) {

                        map.put(key, createHashMapFromJsonString(value.toString()));                    

                     } else if (value.isJsonArray() && value.toString().contains(":")) {

                        List<HashMap<String, Object>> list = new ArrayList<>();                        

                        JsonArray array = value.getAsJsonArray();                        

                        if (null != array) {
                            for (JsonElement element : array) {
                                list.add(createHashMapFromJsonString(element.toString()));                            

                        }
                            map.put(key, list);                        }
                    } else if (value.isJsonArray() && !value.toString().contains(":")) {
                        map.put(key, value.getAsJsonArray());                    }
                } else {
                    map.put(key, value.getAsString());                }
            }
        }
        return map;    }
}