SpringBoot Port Configuration

Port Problem

• Launching multiple instance of SpringBoot Server results to crash.

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 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
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  '  |____| .__|_| |_|_| |_\__, | / / / /
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 :: Spring Boot ::                (v2.4.2)

2021-02-18 15:41:58.469  INFO 11196 --- [           main] c.k.node.NodeServerApplicationKt         : Starting NodeServerApplicationKt using Java 14.0.2 on kdr-navi-server with PID 11196 (/home/hyunwoo286_gmail_com/kdr_cl/CLNodeServer/build/libs/NodeServer-0.0.1-SNAPSHOT.jar started by hyunwoo286_gmail_com in /home/hyunwoo286_gmail_com/kdr_cl/CLNodeServer)
2021-02-18 15:41:58.523  INFO 11196 --- [           main] c.k.node.NodeServerApplicationKt         : No active profile set, falling back to default profiles: default
2021-02-18 15:41:58.895  WARN 11196 --- [kground-preinit] o.s.h.c.j.Jackson2ObjectMapperBuilder    : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2021-02-18 15:42:01.007  INFO 11196 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-02-18 15:42:01.047  INFO 11196 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-02-18 15:42:01.047  INFO 11196 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.41]
2021-02-18 15:42:01.155  INFO 11196 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-02-18 15:42:01.156  INFO 11196 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2331 ms
2021-02-18 15:42:02.260  INFO 11196 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2021-02-18 15:42:02.543  WARN 11196 --- [           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.PortInUseException: Port 8080 is already in use
2021-02-18 15:42:02.545  INFO 11196 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2021-02-18 15:42:02.556  INFO 11196 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2021-02-18 15:42:02.586  INFO 11196 --- [           main] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-02-18 15:42:02.614 ERROR 11196 --- [           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.

Cause

• Multiple Port Conflict/collision

Solution

• Just put --server.port=port_number after after jar command