telegram bot api SendPhoto对象有photo =＆＃39; null＆＃39;

Question

我通过将此照片发送到bot，使用此代码并从机器人响应中复制file_id来获取照片的file_id：

if(receivedUpdate != null && receivedUpdate.getMessage().hasPhoto())
        {
            String file_id_avoid = receivedUpdate.getMessage().getPhoto().stream().findFirst().orElse(null).getFileId();
            sendMessage_text(file_id_avoid);
        }

然后我正在使用它：

messageToBeSent_PHOTO.setPhoto("AgADAgADCagxG29QQEpt1IJFo-l3xVToDw4ABAopYoYfhAlE7P0AAgI").setCaption(null);
            sendMessage_photo();

它说：

org.telegram.telegrambots.exceptions.TelegramApiValidationException：照片在方法中不能为空：SendPhoto {chatId =＆＃39; 230164432＆＃39;，photo =＆＃39; null＆＃39;，caption = ＆＃39; null＆＃39;，replyToMessageId = null，replyMarkup = null，isNewPhoto = false}