問題

? ? ? ? 在win10電腦上啟動SpringBoot項目出現以下報錯

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:185) ~[spring-context-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
? ? ? ? at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53) ~[spring-context-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
? ? ? ? at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360) ~[spring-context-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
? ? ? ? at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158) ~[spring-context-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
? ? ? ? at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122) ~[spring-context-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
? ? ? ? at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:895) ~[spring-context-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
? ? ? ? at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) ~[spring-context-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
? ? ? ? at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at com.zw.msuite.MsuiteApplication.main(MsuiteApplication.java:22) [classes!/:1.0.0]
? ? ? ? at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_202]
? ? ? ? at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49) [msuite-service-1.0.0.jar:1.0.0]
? ? ? ? at org.springframework.boot.loader.Launcher.launch(Launcher.java:107) [msuite-service-1.0.0.jar:1.0.0]
? ? ? ? at org.springframework.boot.loader.Launcher.launch(Launcher.java:58) [msuite-service-1.0.0.jar:1.0.0]
? ? ? ? at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88) [msuite-service-1.0.0.jar:1.0.0]
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-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.boot.web.servlet.context.WebServerStartStopLifecycle.start(WebServerStartStopLifecycle.java:43) ~[spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182) ~[spring-context-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
? ? ? ? ... 22 common frames omitted
Caused by: java.lang.IllegalArgumentException: standardService.connector.startFailed
? ? ? ? at org.apache.catalina.core.StandardService.addConnector(StandardService.java:231) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:282) ~[spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:213) ~[spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
? ? ? ? ... 24 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-9.0.38.jar!/:9.0.38]
? ? ? ? at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? at org.apache.catalina.core.StandardService.addConnector(StandardService.java:227) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? ... 26 common frames omitted
Caused by: java.io.IOException: Unable to establish loopback connection
? ? ? ? at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.PipeImpl.<init>(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at java.nio.channels.Pipe.open(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at java.nio.channels.Selector.open(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector(NioSelectorPool.java:52) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? at org.apache.tomcat.util.net.NioSelectorPool.close(NioSelectorPool.java:119) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? at org.apache.tomcat.util.net.NioEndpoint.unbind(NioEndpoint.java:346) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1146) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1227) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:592) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? at org.apache.catalina.connector.Connector.startInternal(Connector.java:1064) ~[tomcat-embed-core-9.0.38.jar!/:9.0.38]
? ? ? ? ... 28 common frames omitted
Caused by: java.net.ConnectException: Connection timed out: connect
? ? ? ? at sun.nio.ch.Net.connect0(Native Method) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.Net.connect(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.Net.connect(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.SocketChannelImpl.connect(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at java.nio.channels.SocketChannel.open(Unknown Source) ~[na:1.8.0_202]
? ? ? ? at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(Unknown Source) ~[na:1.8.0_202]

問題定位和解決

? ? ? ? 在上述報錯中，標紅的那一行是至關重要的報錯信息。

Caused by: java.io.IOException: Unable to establish loopback connection

? ? ?? ?翻譯為中文：不能建立環回連接。而回環地址就是指127.0.0.1。后來想到可能跟我本機配置的IP安全策略有關。有關安全策略的配置見下面博客。

Windows 10 布置IP安全策略_李劭卓保護美好一切的博客-CSDN博客_windows ip安全策略

? ? ? ? 我在一條安全策略中，啟用了一個"All Deny"的IP篩選器，該篩選器會禁用所有IP訪問我的電腦，并放在篩選器列表的最后生效，作為兜底。

? ? ? ? 關鍵在于這個"All Deny"的IP篩選器的目標地址，我配置了"任何IP地址"（如下圖），這就導致了環回地址（127.0.0.1）也不能被訪問。將目標地址更改為"我的IP地址"之后，上述報錯就消失了，服務能夠正常啟動。

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