String propertiesJSON = obj.get("properties").toString();
                            Type listType = new TypeToken<ArrayList<Property>>() {
                            }.getType();
                            List<Property> propertyList = GsonProvider.getGson().fromJson(propertiesJSON, listType);
                            JsonObject properties = new JsonObject();
                            for (Property property : propertyList) {
                                properties.addProperty(property.key, property.value);
                            }