Application failed to start

Question

I am starting to learn springboot and already encountered an error. I tried searching for this error, but i wasn't able to find it. I have inserted the pictures of the entire error as well as my code for the pom.xml and the main class.

pom.xml

  <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>1.5.2.RELEASE</version>
  </parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>

<properties>
    <java.version>1.8</java.version>
</properties>


</project>

Main

package io.java.springbootstarter;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class CourseApiApp {

     public static void main(String[] args) {


          SpringApplication.run(CourseApiApp.class, args);
        }

   }

This was the description for the error:

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.

2018-03-21 22:47:48.794  INFO 9412 --- [           main] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@f75083: startup date [Wed Mar 21 22:47:46 EDT 2018]; root of context hierarchy
2018-03-21 22:47:48.794  INFO 9412 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown

Error, Error Continued Thank you in advance.

The port 8080 is busy. Stop the process running on 8080 and retry. — Madhusudana Reddy Sunnapu, Mar 22 '18 at 03:11
https://stackoverflow.com/questions/21083170/spring-boot-how-to-configure-port — Garret, Mar 22 '18 at 03:11
no need to be so rude to him... if you not gonna add to the chat just dont... — Garret, Mar 22 '18 at 03:13
I was googling it while asking him @KenWhite, maybe he had encountered an easier solution then what I had come up with. — Denis Jones, Mar 22 '18 at 03:16
declare server.port=8081 in application properties, it might work — JavaLearner1, Mar 22 '18 at 03:17
Thanks guys, found a simple solution and changed it to port 3000 using this : System.getProperties().put( "server.port", 3000 ); — Denis Jones, Mar 22 '18 at 03:21

score 2 · Answer 1 · edited Mar 22 '18 at 09:16

If you are using linux/mac, u can try this command :

lsof -i :8080

This will return the process id along with other information, then use the following command to kill the process :

kill -9 your_process_id

This way, you need not to change the port anymore.

In case the other process is a java process as well, you could also just do jps which shows all running java processes and kill it accordingly.

score 0 · Answer 2 · answered Mar 22 '18 at 05:42

0

The port 8080 in using, you should use another port. You can config in application.properties by setting server.port

answered Mar 22 '18 at 05:42

pain

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score 0 · Answer 3 · answered Mar 22 '18 at 08:04

0

For me just restarting my computer worked. As the error message says some application was already using the specified port.

answered Mar 22 '18 at 08:04

Risalat Zaman

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Application failed to start

3 Answers3