title: The Tomcat connector configured to listen on port 8080 failed
body: <p>Description:</p>
  
  <p>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.</p>
  
  <p>you see the controller class</p>
  
  <pre><code>@Controller
  public class HomeController implements ErrorController {
  
  
      @RequestMapping("/v1")
      public String home()
      {
          return "index";
      }
  
  
       private static final String PATH = "/error";
  
          @RequestMapping(value = PATH)
          public String error() {
              return "Error handling kova";
          }
  
          @Override
          public String getErrorPath() {
              return PATH;
          }
  }//CLASS
  </code></pre>
  
  <p>I have added the following attribute into the file.</p>
  
  <p>application.properties add</p>
  
  <blockquote>
    <p>server.port=8087</p>
  </blockquote>
  
  <p>and the error output looks like this:
  I am having problems changing my port number.</p>
  
  <p>and <strong>error</strong> port problem</p>
  
  <pre><code> org.apache.catalina.LifecycleException: Failed to start component [Connector[HTTP/1.1-8080]]
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
      at org.apache.catalina.core.StandardService.addConnector(StandardService.java:225) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
      at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:256) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:198) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.startWebServer(ServletWebServerApplicationContext.java:300) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553) [spring-context-5.0.6.RELEASE.jar:5.0.6.RELEASE]
      at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.1.0.BUILD-SNAPSHOT.jar:2.1.0.BUILD-SNAPSHOT]
      at com.userfront.UserFront1Application.main(UserFront1Application.java:10) [classes/:na]
  Caused by: org.apache.catalina.LifecycleException: Protocol handler start failed
      at org.apache.catalina.connector.Connector.startInternal(Connector.java:1020) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
      ... 13 common frames omitted
  Caused by: java.net.BindException: Address already in use: bind
      at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_171]
      at sun.nio.ch.Net.bind(Unknown Source) ~[na:1.8.0_171]
      at sun.nio.ch.Net.bind(Unknown Source) ~[na:1.8.0_171]
      at sun.nio.ch.ServerSocketChannelImpl.bind(Unknown Source) ~[na:1.8.0_171]
      at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source) ~[na:1.8.0_171]
      at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:210) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
      at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1150) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
      at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:591) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
      at org.apache.catalina.connector.Connector.startInternal(Connector.java:1018) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
      ... 14 common frames omitted
  
  2018-05-26 23:19:10.439  INFO 1460 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
  2018-05-26 23:19:10.460  INFO 1460 --- [           main] ConditionEvaluationReportLoggingListener : 
  
  Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
  2018-05-26 23:19:10.468 ERROR 1460 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
  
  ***************************
  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.
  
  2018-05-26 23:19:10.470  INFO 1460 --- [           main] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@1761df8: startup date [Sat May 26 23:19:05 EEST 2018]; root of context hierarchy
  2018-05-26 23:19:10.473  INFO 1460 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown
  </code></pre>