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Ao iniciar a aplicação aparece isso no console.

Referente ao curso Spring Boot API REST: construa uma API, no capítulo Introdução ao Spring Boot e atividade Hello World

por Danilo Souza
| 133.3k xp | 15 posts
técnico em informática 
org.apache.catalina.LifecycleException: Protocol handler start failed
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1008) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    at org.apache.catalina.core.StandardService.addConnector(StandardService.java:226) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:259) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:197) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.startWebServer(ServletWebServerApplicationContext.java:311) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:164) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at br.com.alura.forum.ForumApplication.main(ForumApplication.java:10) ~[classes/:na]
Caused by: java.net.BindException: Address already in use: bind
    at java.base/sun.nio.ch.Net.bind0(Native Method) ~[na:na]
    at java.base/sun.nio.ch.Net.bind(Net.java:469) ~[na:na]
    at java.base/sun.nio.ch.Net.bind(Net.java:458) ~[na:na]
    at java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:220) ~[na:na]
    at java.base/sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:88) ~[na:na]
    at org.apache.tomcat.util.net.NioEndpoint.initServerSocket(NioEndpoint.java:236) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:210) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1103) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1189) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:568) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1005) ~[tomcat-embed-core-9.0.17.jar:9.0.17]
    ... 14 common frames omitted
3 respostas
por Danilo Souza
| 133.3k xp | 15 posts
técnico em informática

fiz tudo denovo e agora tá assim.

 .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.6.RELEASE)

2020-05-05 19:48:52.293  INFO 10576 --- [           main] br.com.alura.forum.ForumApplication      : Starting ForumApplication on DESKTOP-V92DE0I with PID 10576 (C:\Users\Danilo\Downloads\forum\target\classes started by Danilo in C:\Users\Danilo\Downloads\forum)
2020-05-05 19:48:52.303  INFO 10576 --- [           main] br.com.alura.forum.ForumApplication      : No active profile set, falling back to default profiles: default
2020-05-05 19:48:57.628  INFO 10576 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-05-05 19:48:57.681  INFO 10576 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-05-05 19:48:57.681  INFO 10576 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.33]
2020-05-05 19:48:57.884  INFO 10576 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-05-05 19:48:57.885  INFO 10576 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 5111 ms
2020-05-05 19:48:58.614  INFO 10576 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-05-05 19:48:59.859  INFO 10576 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2020-05-05 19:48:59.876  INFO 10576 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-05-05 19:48:59.881 ERROR 10576 --- [           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.

2020-05-05 19:48:59.898  INFO 10576 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
por Danilo Souza
| 133.3k xp | 15 posts
técnico em informática

Eu to achando que terei que configurar a porta 8080 pra outra, vou tentar fazer isso.

solução!
por Danilo Souza
| 133.3k xp | 15 posts
técnico em informática

alterei o arquivo application.properties localizado no package src/main/resources e mudei a porta, pra quem teve o mesmo problema aí esta a solução.