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Am getting the below error while starting my spring-boot application . This is my first spring-boot project. so, am not sure about the error and how to fix it.

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.

2018-04-28 21:42:16.248 INFO 13196 --- [lication.main()] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@57ac5b74: startup date [Sat Apr 28 21:42:11 IST 2018]; root of context hierarchy 2018-04-28 21:42:16.249 INFO 13196 --- [lication.main()] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown [WARNING] java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.boot.maven.RunMojo$LaunchRunner.run(RunMojo.java:423) at java.lang.Thread.run(Thread.java:748) Caused by: org.springframework.boot.context.embedded.tomcat.ConnectorStartFailedException: Connector configured to listen on port 8080 failed to start at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.checkThatConnectorsHaveStarted(TomcatEmbeddedServletContainer.java:222) at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:198) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:297) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:145) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) at com.journaldev.elasticsearch.Elastic6Application.main(Elastic6Application.java:12) ... 6 more
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    Looks like a process uses 8080 already. Check lsof -n -i4TCP:8080 Commented Apr 28, 2018 at 16:22

4 Answers 4

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Run lsof -n -i4TCP:8080 to find PID of the process that use 8080. You will get an output something like that:

COMMAND PID USER FD TYPE NODE NAME java 72180 hisener 223u IPv6 TCP *:http-alt (LISTEN)

And then run kill -9 72180 to kill the process. (Change 72180 to your PID).

Now, you should be able to run your spring boot application.

For windows, the equivalent of commands above:

Find PID of process that use a port: netstat -aon | find "8080"

Kill the process by PID: taskkill /F /PID 72180

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  1. Run sudo lsof -i tcp:8080 to get the PID and then kill the process using kill -9 xxxxx where "xxxxx" is your PID and now you can restart your application at port 8080

  2. Change your application's server port to something other than 8080. You can do this by going to application.properties and typing server.port = xxxx where xxxx is the port you want to run your application at. You can also type server.port=0 this will allocate a random port which is available. You can find the port in your logs while the application starts and run your application at that port

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I assume that you have already a process that is listening on port 8080. Have a look for a java (or others) process in your process table and kill it. This happens sometimes when spring boot doesn't stop and run in the background

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Use some other port. Manually configure the port in the application.properties like below server.port=8082 or some other port.

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