Springboot Failed to start bean 'webServerStartStop'

1　　报错信息

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-12-01 23:46:25.130 ERROR 15644 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.context.ApplicationContextException: Failed to start bean 'webServerStartStop'; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat server
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.1.jar:5.3.1]
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.1.jar:5.3.1]
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.1.jar:5.3.1]
    at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_77]
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.1.jar:5.3.1]
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.1.jar:5.3.1]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:942) ~[spring-context-5.3.1.jar:5.3.1]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:591) ~[spring-context-5.3.1.jar:5.3.1]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298) [spring-boot-2.4.0.jar:2.4.0]
    at com.example.demo.DemoApplication.main(DemoApplication.java:10) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_77]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_77]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_77]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_77]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.4.0.jar:2.4.0]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat server
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:229) ~[spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.web.servlet.context.WebServerStartStopLifecycle.start(WebServerStartStopLifecycle.java:43) ~[spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.1.jar:5.3.1]
    ... 20 common frames omitted
Caused by: java.lang.IllegalArgumentException: standardService.connector.startFailed
    at org.apache.catalina.core.StandardService.addConnector(StandardService.java:231) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:282) ~[spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:213) ~[spring-boot-2.4.0.jar:2.4.0]
    ... 22 common frames omitted
Caused by: org.apache.catalina.LifecycleException: Protocol handler start failed
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1067) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    at org.apache.catalina.core.StandardService.addConnector(StandardService.java:227) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    ... 24 common frames omitted
Caused by: java.net.BindException: Cannot assign requested address: bind
    at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_77]
    at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_77]
    at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_77]
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_77]
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_77]
    at org.apache.tomcat.util.net.NioEndpoint.initServerSocket(NioEndpoint.java:228) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:211) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1141) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1227) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:592) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1064) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
    ... 26 common frames omitted

 

2　　问题排查：

2.a　　是否是自己修改了哪个文件？导致报错

由于本人初学springboot，学习上一节时，springboot还可以正常启动，但是在学习freemarker之后，就不行了。

 

排查方法：按照intelligentidea 进行快照还原，还原到上一版时点，进行重启，发现还是不行，无法启动。

 

2.b　　是否是pom.xml导入的依赖导致？

最开是的问题是freemarker，引用的properties配置文件的中文乱码，百度说用yml不会乱码，自己进行了尝试yml，是否是因为pom.xml 引入了依赖，后来虽然依赖删除了，但是相关jar包资源还在？（事实上是我多想了，当时没有在pom.xml引入相关依赖）

 

排查方法：idea找到对应的maven导入jar包的路径，全部清空。然后重新保存pom.xml（自动导入jar包）。然并卵。

 

2.c　　实在没有办法了，FQ找，这种问题我看大部分都是端口，配置文件什么的，但是自己的端口又没有被占用啊。没办法，再查查吧

 

排查方法：win10 以管理员身份运行命令窗口，netstat -ano|findstr 808*,结果也没有看到相关的端口被占用，没办法，这个端口占用的又被排除了。

 

2.d　　端口没问题了，是不是ip有问题呢？因为以前学习的是server端的配置，有绑定ip的时候根据ipv4去配置的，没有用localhost或者127.0.0.1，

 

排查方法：重新查看ipv4，在application.properties中进行修改，重新启动，问题解决。

 

3　　总结：

总结了下，上次学习的时候在国图，电脑连的是手机开的热点，遇到问题的时候是在家里，练的wifi。所以ipv4的网址是变动的（而我以前一直认为ipv4是不变的），这也是最大的收获吧！花了两天，解决出来了一个问题啊