title: Failed to start bean 'webServerStartStop'; Unable to start embedded Tomcat server - spring-boot-starter-web
body: <p>Spring application using Maven including only Spring Web dependency gives &quot;Unable to start embedded Tomcat serve&quot; error.</p>
  <p>The same project runs on other computers like expected.</p>
  <p>Spring Boot Version: 2.4.3 <br/>
  Package Type: JAR <br/>
  Java Version: 11</p>
  <p>No additional code added from the starter project except to print to the console for testing.</p>
  <ul>
  <li>Application runs and prints to the console like expected when tomcat is excluded int the pom.xml.</li>
  <li>Tested multiple ports.</li>
  <li>Tested JDK 8 and 11.</li>
  </ul>
  <p>pom.xml dependancies:</p>
  <pre><code>    &lt;dependencies&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-test&lt;/artifactId&gt;
              &lt;scope&gt;test&lt;/scope&gt;
          &lt;/dependency&gt;
      &lt;/dependencies&gt;
  </code></pre>
  <p>Log:</p>
  <pre><code>2021-02-22 16:17:28.896  INFO 34556 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication using Java 11.0.10 on Soul with PID 34556 (C:\Users\ryne0\Desktop\FullStackWeb\Spring\demo\target\classes started by ryne0 in C:\Users\ryne0\Desktop\FullStackWeb\Spring\demo)
  2021-02-22 16:17:28.900  INFO 34556 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
  2021-02-22 16:17:28.902 DEBUG 34556 --- [           main] o.s.boot.SpringApplication               : Loading source class com.example.demo.DemoApplication
  2021-02-22 16:17:28.995 DEBUG 34556 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@457c9034
  2021-02-22 16:17:30.317 DEBUG 34556 --- [           main] .s.b.w.e.t.TomcatServletWebServerFactory : Code archive: C:\Users\ryne0\.m2\repository\org\springframework\boot\spring-boot\2.4.3\spring-boot-2.4.3.jar
  2021-02-22 16:17:30.318 DEBUG 34556 --- [           main] .s.b.w.e.t.TomcatServletWebServerFactory : Code archive: C:\Users\ryne0\.m2\repository\org\springframework\boot\spring-boot\2.4.3\spring-boot-2.4.3.jar
  2021-02-22 16:17:30.318 DEBUG 34556 --- [           main] .s.b.w.e.t.TomcatServletWebServerFactory : None of the document roots [src/main/webapp, public, static] point to a directory and will be ignored.
  2021-02-22 16:17:30.353  INFO 34556 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 81 (http)
  2021-02-22 16:17:30.374  INFO 34556 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
  2021-02-22 16:17:30.387  INFO 34556 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.43]
  2021-02-22 16:17:30.507  INFO 34556 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
  2021-02-22 16:17:30.507 DEBUG 34556 --- [           main] w.s.c.ServletWebServerApplicationContext : Published root WebApplicationContext as ServletContext attribute with name [org.springframework.web.context.WebApplicationContext.ROOT]
  2021-02-22 16:17:30.508  INFO 34556 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1513 ms
  2021-02-22 16:17:30.535 DEBUG 34556 --- [           main] o.s.b.w.s.ServletContextInitializerBeans : Mapping filters: characterEncodingFilter urls=[/*] order=-2147483648, formContentFilter urls=[/*] order=-9900, requestContextFilter urls=[/*] order=-105
  2021-02-22 16:17:30.547 DEBUG 34556 --- [           main] o.s.b.w.s.ServletContextInitializerBeans : Mapping servlets: dispatcherServlet urls=[/]
  2021-02-22 16:17:30.599 DEBUG 34556 --- [           main] o.s.b.w.s.f.OrderedRequestContextFilter  : Filter 'requestContextFilter' configured for use
  2021-02-22 16:17:30.600 DEBUG 34556 --- [           main] s.b.w.s.f.OrderedCharacterEncodingFilter : Filter 'characterEncodingFilter' configured for use
  2021-02-22 16:17:30.600 DEBUG 34556 --- [           main] o.s.b.w.s.f.OrderedFormContentFilter     : Filter 'formContentFilter' configured for use
  2021-02-22 16:17:30.817  INFO 34556 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
  2021-02-22 16:17:30.828 DEBUG 34556 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : ControllerAdvice beans: 0 @ModelAttribute, 0 @InitBinder, 1 RequestBodyAdvice, 1 ResponseBodyAdvice
  2021-02-22 16:17:30.949 DEBUG 34556 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : 2 mappings in 'requestMappingHandlerMapping'
  2021-02-22 16:17:30.991 DEBUG 34556 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Patterns [/webjars/**, /**] in 'resourceHandlerMapping'
  2021-02-22 16:17:31.003 DEBUG 34556 --- [           main] .m.m.a.ExceptionHandlerExceptionResolver : ControllerAdvice beans: 0 @ExceptionHandler, 1 ResponseBodyAdvice
  2021-02-22 16:17:31.104  WARN 34556 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Failed to start bean 'webServerStartStop'; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat server
  2021-02-22 16:17:31.110  INFO 34556 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
  2021-02-22 16:17:31.122  INFO 34556 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
  2021-02-22 16:17:31.197 DEBUG 34556 --- [           main] ConditionEvaluationReportLoggingListener : 
  
  
  
  2021-02-22 16:17:32.117 ERROR 34556 --- [           main] 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-5.3.4.jar:5.3.4]
          at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.4.jar:5.3.4]
          at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.4.jar:5.3.4]
          at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
          at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.4.jar:5.3.4]
          at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.4.jar:5.3.4]
          at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:934) ~[spring-context-5.3.4.jar:5.3.4]
          at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:585) ~[spring-context-5.3.4.jar:5.3.4]
          at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.3.jar:2.4.3]
          at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.3.jar:2.4.3]
          at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.3.jar:2.4.3]
          at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.3.jar:2.4.3]
          at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.3.jar:2.4.3]
          at org.springframework.boot.SpringApplication.run(SpringApplication.java:1311) ~[spring-boot-2.4.3.jar:2.4.3]
          at org.springframework.boot.SpringApplication.run(SpringApplication.java:1300) ~[spring-boot-2.4.3.jar:2.4.3]
          at com.example.demo.DemoApplication.main(DemoApplication.java:10) ~[classes/:na]
  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-2.4.3.jar:2.4.3]
          at org.springframework.boot.web.servlet.context.WebServerStartStopLifecycle.start(WebServerStartStopLifecycle.java:43) ~[spring-boot-2.4.3.jar:2.4.3]
          at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.4.jar:5.3.4]
          ... 15 common frames omitted
  Caused by: java.lang.IllegalArgumentException: standardService.connector.startFailed
          at org.apache.catalina.core.StandardService.addConnector(StandardService.java:244) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:282) ~[spring-boot-2.4.3.jar:2.4.3]
          at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:213) ~[spring-boot-2.4.3.jar:2.4.3]
          ... 17 common frames omitted
  Caused by: org.apache.catalina.LifecycleException: Protocol handler start failed
          at org.apache.catalina.connector.Connector.startInternal(Connector.java:1074) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.StandardService.addConnector(StandardService.java:240) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          ... 19 common frames omitted
  Caused by: java.io.IOException: Unable to establish loopback connection
          at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:94) ~[na:na]
          at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:61) ~[na:na]
          at java.base/java.security.AccessController.doPrivileged(Native Method) ~[na:na]
          at java.base/sun.nio.ch.PipeImpl.&lt;init&gt;(PipeImpl.java:171) ~[na:na]
          at java.base/sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50) ~[na:na]
          at java.base/java.nio.channels.Pipe.open(Pipe.java:155) ~[na:na]
          at java.base/sun.nio.ch.WindowsSelectorImpl.&lt;init&gt;(WindowsSelectorImpl.java:142) ~[na:na]
          at java.base/sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44) ~[na:na]
          at java.base/java.nio.channels.Selector.open(Selector.java:295) ~[na:na]
          at org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector(NioSelectorPool.java:52) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.tomcat.util.net.NioSelectorPool.close(NioSelectorPool.java:119) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.tomcat.util.net.NioEndpoint.unbind(NioEndpoint.java:386) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1198) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1279) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:608) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.connector.Connector.startInternal(Connector.java:1071) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          ... 21 common frames omitted
  Caused by: java.net.BindException: Cannot assign requested address: connect
          at java.base/sun.nio.ch.Net.connect0(Native Method) ~[na:na]
          at java.base/sun.nio.ch.Net.connect(Net.java:476) ~[na:na]
          at java.base/sun.nio.ch.Net.connect(Net.java:468) ~[na:na]
          at java.base/sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:694) ~[na:na]
          at java.base/java.nio.channels.SocketChannel.open(SocketChannel.java:194) ~[na:na]
          at java.base/sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:127) ~[na:na]
          at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:76) ~[na:na]
          ... 36 common frames omitted
  </code></pre>