MqttException (0)
at org.eclipse.paho.client.mqttv3.persist.MqttDefaultFilePersistence.restoreBackups(MqttDefaultFilePersistence.java:276)
at org.eclipse.paho.client.mqttv3.persist.MqttDefaultFilePersistence.open(MqttDefaultFilePersistence.java:126)
at org.eclipse.paho.client.mqttv3.internal.ConnectActionListener.connect(ConnectActionListener.java:174)
at org.eclipse.paho.client.mqttv3.internal.ConnectActionListener.onFailure(ConnectActionListener.java:137)
at org.eclipse.paho.client.mqttv3.internal.CommsCallback.fireActionEvent(CommsCallback.java:326)
at org.eclipse.paho.client.mqttv3.internal.CommsCallback.handleActionComplete(CommsCallback.java:260)
at org.eclipse.paho.client.mqttv3.internal.CommsCallback.asyncOperationComplete(CommsCallback.java:445)
at org.eclipse.paho.client.mqttv3.internal.ClientComms.shutdownConnection(ClientComms.java:418)
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:170)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
hi
请检查 mqtt 客户端是否能够成功启动以及有无连接到 EMQX
建议使用 trace 功能，对该客户端进行追踪以观察其行为