[SpringBoot] spring boot failed to start : The port may already be in use or the connector may be misconfigured.

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APPLICATION FAILED TO START
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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.
 
2018-10-31 11:21:06.701  INFO 888496 --- [           main] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3745e5c6: startup date [Wed Oct 31 11:20:58 KST 2018]; root of context hierarchy
2018-10-31 11:21:06.712  INFO 888496 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown
 
> Task :bootRun FAILED
 
FAILURE: Build failed with an exception.
 
* What went wrong:
Execution failed for task ':bootRun'.
> Process 'command 'C:\Program Files\Java\jdk1.8.0_91\bin\java.exe'' finished with non-zero exit value 1

IntelliJ terminal에서 netstat 으로 listening인 port를 검색해보니, server.port로 설정했던 port가 검색되었다. 

> netstat -ao |find /i "listening"

netstat -ao |find /i "listening"
  TCP    0.0.0.0:8080           LAPTOP-I5UEB5UM:0      LISTENING
    136432
  TCP    0.0.0.0:8090           LAPTOP-I5UEB5UM:0      LISTENING
    848480
  TCP    0.0.0.0:8099           LAPTOP-I5UEB5UM:0      LISTENING
    853020
  TCP    [::]:8080              LAPTOP-I5UEB5UM:0      LISTENING       136432
  TCP    [::]:8090              LAPTOP-I5UEB5UM:0      LISTENING       848480
  TCP    [::]:8099              LAPTOP-I5UEB5UM:0      LISTENING       853020

일단 위 port를 kill 해보겠다.

> Taskkill /F /IM [PID]

C:\Users\sy.yoon.CONIN\Downloads\demo (1)\demo>Taskkill /F /IM 136432
성공: 프로세스(PID 136432)가 종료되었습니다.
 
C:\Users\sy.yoon.CONIN\Downloads\demo (1)\demo>Taskkill /F /IM 848480
성공: 프로세스(PID 848480)가 종료되었습니다.
 
C:\Users\sy.yoon.CONIN\Downloads\demo (1)\demo>Taskkill /F /IM 853020
성공: 프로세스(PID 853020)가 종료되었습니다.

그리고 나서 다시 bootRun

오전 11:31:59: Executing task 'bootRun'...
 
> Task :compileJava UP-TO-DATE
> Task :processResources UP-TO-DATE
> Task :classes UP-TO-DATE
 
> Task :bootRun
 
  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.6.RELEASE)
 
2018-10-31 11:32:04.189  INFO 893800 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication on LAPTOP-I5UEB5UM with PID 893800 (started by sy.yoon in C:\Users\sy.yoon.CONIN\Downloads\demo (1)\demo)
2018-10-31 11:32:04.221  INFO 893800 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2018-10-31 11:32:04.349  INFO 893800 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@75c072cb: startup date [Wed Oct 31 11:32:04 KST 2018]; root of context hierarchy
2018-10-31 11:32:09.182 ERROR 893800 --- [           main] o.a.catalina.core.AprLifecycleListener   : An incompatible version [1.1.3] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]
2018-10-31 11:32:09.867  INFO 893800 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-10-31 11:32:09.901 ERROR 893800 --- [           main] o.a.catalina.core.AprLifecycleListener   : An incompatible version [1.1.3] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]
2018-10-31 11:32:09.924  INFO 893800 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-10-31 11:32:09.925  INFO 893800 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.34
2018-10-31 11:32:09.944 ERROR 893800 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : An incompatible version [1.1.3] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]
2018-10-31 11:32:10.538  INFO 893800 --- [ost-startStop-1] org.apache.jasper.servlet.TldScanner     : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2018-10-31 11:32:10.550  INFO 893800 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-10-31 11:32:10.551  INFO 893800 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 6206 ms
2018-10-31 11:32:10.719  INFO 893800 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2018-10-31 11:32:10.725  INFO 893800 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-10-31 11:32:10.725  INFO 893800 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-10-31 11:32:10.725  INFO 893800 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-10-31 11:32:10.725  INFO 893800 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-10-31 11:32:10.983  INFO 893800 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-31 11:32:11.255  INFO 893800 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@75c072cb: startup date [Wed Oct 31 11:32:04 KST 2018]; root of context hierarchy
2018-10-31 11:32:11.389  INFO 893800 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/posts/new],methods=[GET]}" onto public java.lang.String com.example.demo.controller.DemoController.newPost(org.springframework.ui.Model)
2018-10-31 11:32:11.393  INFO 893800 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-10-31 11:32:11.394  INFO 893800 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-10-31 11:32:11.426  INFO 893800 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-31 11:32:11.427  INFO 893800 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-31 11:32:11.730  INFO 893800 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-10-31 11:32:13.456  INFO 893800 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-10-31 11:32:13.476  INFO 893800 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 9.984 seconds (JVM running for 10.787)

다시 정상적으로 작동된다.