使用Spring Boot引发Web服务时出错

Question

I'm doing these days my first steps with Spring Boot. I used this article https://spring.io/guides/gs/rest-service/#use-maven to build a simple web service.

This is the code I wrote:

package com.example;

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

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}


package com.example;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String sayHi() {
        return "Hi";
    }

}

I run it by "sprint-boot:run".The code compiles successfully and after a few seconds exits with exit code 1. The error is:

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.4.3.RELEASE:run (default-cli) on project demo: An exception occurred while running. null: InvocationTargetException: Connector configured to listen on port 8080 failed to start -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

Answer 1

The fact that it stops right away indicates that Spring-Boot did not find tomcat in its classpath.

You need to include spring-boot-starter-web so that tomcat is found, autoconfigured and launched at startup with your application.

So basically, just add:

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

---

The other issue isn't a true problem:

Connector configured to listen on port 8080 failed to start

It's simply caused by another process already using port 8080. To bypass this, add the following in your application.properties :

server.port=8081