Json parse GWT

public void onResponseReceived(Request request,Response response) {
					if (200 == response.getStatusCode()) {
						try {
							@SuppressWarnings("deprecation")
							JSONValue jsonValue = JSONParser.parse(response.getText());
							JSONArray jsonArray = jsonValue.isArray();
							
							if (jsonArray != null) {
								List<b> rets = new ArrayList<b>();
								
								for (int i = 0; i < jsonArray.size(); i++) {
									JSONValue maquinaJson = jsonArray.get(i);
									JSONString maquinaJsonString = maquinaJson.isString();

									b data = asArrayOfStockData(maquinaJsonString.stringValue());
									b maquina = data.cast();
									
									rets.add(maquina);
								}