一、异常错误

• Spring-boot启动Run时，出现 o.s.j.e.a.AnnotationMBeanExporter - Unregistering JMX-exposed beans on shutdown 错误

*************************** APPLICATION FAILED TO START

---

Description:

The Tomcat connector configured to listen on port 8080 failed to
start. The port may already be in use or the connector may be
misconfigured.

Action:

Verify the connector’s configuration, identify and stop any process
that’s listening on port 8080, or configure this application to listen
on another port.

2023-01-03 12:12:42 [restartedMain] INFO
o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext -
Closing
org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@611a84d8:
startup date [Tue Jan 03 20:12:35 CST 2023]; root of context hierarchy
2023-01-03 12:12:42 [restartedMain] INFO
o.s.j.e.a.AnnotationMBeanExporter - Unregistering JMX-exposed beans on
shutdown 2023-01-03 12:12:42 [restartedMain] INFO
o.s.j.e.a.AnnotationMBeanExporter - Unregistering JMX-exposed beans
Disconnected from the target VM, address: ‘127.0.0.1:14533’,
transport: ‘socket’

***************************
APPLICATION FAILED TO START
***************************

Description:

The Tomcat connector configured to listen on port 8080 failed to start. The port may already be in use or the connector may be misconfigured.

Action:

Verify the connector's configuration, identify and stop any process that's listening on port 8080, or configure this application to listen on another port.

2023-01-03 12:12:42 [restartedMain] INFO  o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@611a84d8: startup date [Tue Jan 03 20:12:35 CST 2023]; root of context hierarchy
2023-01-03 12:12:42 [restartedMain] INFO  o.s.j.e.a.AnnotationMBeanExporter - Unregistering JMX-exposed beans on shutdown
2023-01-03 12:12:42 [restartedMain] INFO  o.s.j.e.a.AnnotationMBeanExporter - Unregistering JMX-exposed beans
Disconnected from the target VM, address: '127.0.0.1:14533', transport: 'socket'

二、原因

• Tomcat 的默认8080端口被占用

三、解决方法

• cmd输入netstat -ano|findstr 8080，找到占用8080端口的进程
• 列对应的分别是：协议-本地地址-外部地址-状态-PID
• 输入taskkill /f /pid PID终止8080端口进程，此例PID为5476，故输入taskkill /f /pid 5476

• 或者打开任务管理器，找到PID为5476的进程将其结束

• 重新Spring-boot启动Run，一直转圈但未报出SEVERE: Failed异常，表示Tomcat是正常运行的，打开浏览器输入访问地址即可