Fails to start when using @SpringBootApplication with SpringApplicationBuilder.sources

use @SpringBootApplication with SpringApplicationBuilder，my app starts failed

// main method
new SpringApplicationBuilder()
                .sources(ParentConfig.class)
                .child(Child1Config.class)
                .sibling(Child2Config.class)
                .banner(new AppBanner())
                .logStartupInfo(false)
                .run(args);

// ParentConfig
@SpringBootApplication
@PropertySource("classpath:/parent.properties")
public class ParentConfig {
}

// Child1Config 
@SpringBootApplication
@PropertySource("classpath:/child1.properties")
public class Child1Config {

}

// Child2Config 
@SpringBootApplication
@PropertySource("classpath:/child2.properties")
public class Child2Config {

}

the error log as follow:

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.

2018-02-26 14:30:41.239  INFO 33664 --- [           main] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@109f5dd8: startup date [Mon Feb 26 14:30:39 CST 2018]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@a4102b8
2018-02-26 14:30:41.242  INFO 33664 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown

the version of springboot is “2.0.0.RC2” or “2.0.0.BUILD-SNAPSHOT”

but if i change the version to “1.5.10.RELEASE”, it work fine. Another solutation is change the @SpringBootApplication to @Configuration in ParentConfig.java.

I don’t know why, can anyone tell me? Thank you very much!!!

[rsb-tech]

I have also faced the same issue, to overcome this issue you can kill the PID using following commands.

C:\Users\Admin> netstat -ano | findstr :8080

It will show as below:

  TCP    0.0.0.0:8080           0.0.0.0:0              LISTENING       6956
  TCP    [::]:8080              [::]:0                 LISTENING       6956

Then run the below command to kill the PID

C:\Users\Admin>taskkill /PID 6956 /F
SUCCESS: The process with PID 6956 has been terminated.

Now you can re run the Spring application smoothly. Thank you!!

[Kamalesh-147]

Run the command with the port used : example : lsof -i : 8080(Port number)

Now kill the process. command -: kill -9 <PID> (example : kill -9 8080).