Spring Boot 启动错误：Failed to start component [Connector[HTTP/1.1-8081]]

问题描述

启动Spring Boot项目提示如下错误

ERROR org.apache.catalina.util.LifecycleBase:175 - Failed to start component [Connector[HTTP/1.1-8081]]
org.apache.catalina.LifecycleException: Protocol handler start failed
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1008)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.addConnector(StandardService.java:226)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:259)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:197)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.startWebServer(ServletWebServerApplicationContext.java:311)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:164)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
at org.jeecg.JeecgApplication.main(JeecgApplication.java:48)
Caused by: java.net.BindException: Address already in use: bind
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:433)
at sun.nio.ch.Net.bind(Net.java:425)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.apache.tomcat.util.net.NioEndpoint.initServerSocket(NioEndpoint.java:236)
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:210)
at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1085)
at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1171)
at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:568)
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1005)
… 14 common frames omitted

解决方案

1、错误信息提示 Protocol handler start failed，说明是Protocol 协议出现问题；

2、进一步查看错误信息发现此行：由此抛出的异常发现：地址已被使用
Caused by: java.net.BindException: Address already in use: bind

3、由最上面的一行看出，系统中使用了端口8081，把相关的程序关闭即可
ERROR org.apache.catalina.util.LifecycleBase:175 - Failed to start component [Connector[HTTP/1.1-8081]]

4、相关的程序关闭，重启服务即可解决