eclipse-paho / eclipse-paho/paho.mqtt.java

Still receive messgae though mqtt broker has stopped

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Description

- [ ] Bug exists Release Version 1.2.3 ( Master Branch)
- [ ] Bug exists in MQTTv3 Client on Snapshot Version 1.2.4-SNAPSHOT (Develop Branch)
- [ ] Bug exists in MQTTv5 Client on Snapshot Version 1.2.3-SNAPSHOT (Develop Branch)

I don't know which classification my problem belongs to, because I just use paho mqtt in springboot where I can integrate paho mqtt with Maven tools. But it is indeed paho mqtt,like below:
![image](https://user-images.githubusercontent.com/22230082/85359110-f5d67700-b547-11ea-8341-450637507851.png)

My problem is that there is still mqtt messages printed by MqttCallback.messageArrived function though my mqtt broker has stopped. By the way, my mqtt broker is emqx broker 4.0.

What I want to know is that is there a message buffer in paho mqtt client ?

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