[Spring] Web server failed to start. Port 8080 was already in use. 해결 방법

윈도우 기준입니다.

 

 

Application을 Run하니 이런 에러가 떴다.

 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-02-04 00:22:40.284 ERROR 34156 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Web server failed to start. Port 8080 was already in use.

Action:

Identify and stop the process that's listening on port 8080 or configure this application to listen on another port.


Process finished with exit code 1

 

Web server failed to start. Port 8080 was already in use.

8080 포트를 이미 사용중이라서 웹 서버가 시작하는 것을 실패했다.

 

 

🧚‍♀️ 해결 방법

 

해당 포트를 사용하는 프로세스를 종료시키는 방법과 서버 포트를 임의로 설정해주는 방법이 있다.

 

두번째 방법이 더 쉬우니까 나중에 알아보자.

 

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프로세스 강제 종료

명령 프롬프트(CMD) 관리자 권한으로 실행

 

 

netstat -ano

(Ctrl C - 종료)

 

taskkill /F /pid 5132

8080 포트의 process id인 5132를 강제 종료한다.

 

 

mac

sudo lsof -i :<port>

포트 열려있는지 확인

ex) sudo lsof -i :10001

 

kill -9 <PID>

강제종료

ex ) kill -9 7113

 

 

해결

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.6.3)

2022-02-04 00:41:04.337  INFO 26024 --- [           main] hello.servlet.ServletApplication         : Starting ServletApplication using Java 11.0.12 on DESKTOP-16SSFG6 with PID 26024 (C:\Spring\Projects\servlet\out\production\classes started by mycom in C:\Spring\Projects\servlet)
2022-02-04 00:41:04.343  INFO 26024 --- [           main] hello.servlet.ServletApplication         : No active profile set, falling back to default profiles: default
2022-02-04 00:41:05.845  INFO 26024 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2022-02-04 00:41:05.861  INFO 26024 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2022-02-04 00:41:05.861  INFO 26024 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.56]
2022-02-04 00:41:05.988  INFO 26024 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2022-02-04 00:41:05.988  INFO 26024 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1513 ms
2022-02-04 00:41:06.392  INFO 26024 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2022-02-04 00:41:06.405  INFO 26024 --- [           main] hello.servlet.ServletApplication         : Started ServletApplication in 2.932 seconds (JVM running for 6.848)

 

 

---

서버 포트 설정

매번 프로세스 종료하기 귀찮으니 사용 포트를 설정해주자.

src/resources/application.properties에 들어가서 설정

server.port=지정할 포트번호

 

해결

설정한 포트로 잘 실행되는 것을 볼 수 있다.

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.6.3)

2022-02-04 00:47:52.669  INFO 28352 --- [           main] hello.servlet.ServletApplication         : Starting ServletApplication using Java 11.0.12 on DESKTOP-16SSFG6 with PID 28352 (C:\Spring\Projects\servlet\out\production\classes started by mycom in C:\Spring\Projects\servlet)
2022-02-04 00:47:52.674  INFO 28352 --- [           main] hello.servlet.ServletApplication         : No active profile set, falling back to default profiles: default
2022-02-04 00:47:54.315  INFO 28352 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8086 (http)
2022-02-04 00:47:54.326  INFO 28352 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2022-02-04 00:47:54.326  INFO 28352 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.56]
2022-02-04 00:47:54.421  INFO 28352 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2022-02-04 00:47:54.421  INFO 28352 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1563 ms
2022-02-04 00:47:54.873  INFO 28352 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8086 (http) with context path ''
2022-02-04 00:47:54.887  INFO 28352 --- [           main] hello.servlet.ServletApplication         : Started ServletApplication in 2.943 seconds (JVM running for 5.08)