Java SMSlib未定义任何网关

我正在尝试学习使用SMSlib发送短信使用中兴MF631 usb调制解调器。这是我的密码：

        Service.getInstance().startService();
        SerialModemGateway gateway = new SerialModemGateway("modem.com5","COM5", 115200, "ZTE", "MF631");

        gateway.setInbound(true);
        gateway.setOutbound(true);
        gateway.setSimPin("0000");
        gateway.setSmscNumber("+9779800009000");

        try {

           Service.getInstance().addGateway(gateway);
           OutboundMessage outboundMsg = new OutboundMessage("+9779843669921", "Hello there!");
           Service.getInstance().sendMessage(outboundMsg);
        } finally {
            gateway.stopGateway();
            Service.getInstance().removeGateway(gateway);
            Service.getInstance().stopService();
        }

当我运行代码时，出现以下错误：

org.smslib.SMSLibException: No gateways are defined.
    at org.smslib.Service.startService_Internal(Service.java:295)
    at org.smslib.Service.startService(Service.java:229)
    at org.smslib.Service.startService(Service.java:196)
    at com.mail.utility.SendSmsUtility.sendSMS(SendSmsUtility.java:10)
    at com.mail.action.SendSmsAction.sendSms(SendSmsAction.java:11)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

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在开始服务之前，我认为您缺少以下内容：

Service.getInstance().addGateway(gateway);

---

以下是

我已使用addGateway和removeGateway更新了代码，但仍然收到相同的错误。您能否尝试移动Service.getInstance.startService；在addGatewaygateway线路之后？谢谢！这就解决了问题