Java 订阅主题时报错

[chenhao8650]

Java连接mqqt后，订阅主题时，报错：
MqttException (128)
at org.eclipse.paho.client.mqttv3.MqttClient.subscribe(MqttClient.java:466)
at org.eclipse.paho.client.mqttv3.MqttClient.subscribe(MqttClient.java:429)
at org.eclipse.paho.client.mqttv3.MqttClient.subscribe(MqttClient.java:422)
at com.chinawinddata.transfer.MqttOneWayTlsSample.main(MqttOneWayTlsSample.java:82)

[blankalupo]

从你提供的内容，发现不了什么，建议你先在你的客户端 Debug 下

[chenhao8650]

debug了，走到client.subscribe(TOPIC, QoS);这行代码报错