Spring Boot Application Tomcat Server not running

Question

I have the following code in my CourseApiApp.java file:

package io.myapp.hellospringboot;

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);

    }

}

When I press the play button I see the following console messages:

main] i.a.hellospringboot.CourseApiApp         : Starting CourseApiApp on johndoe-MacBook-Pro.local with PID 22730 (/Users/johndoe/Documents/workspace-sts-3.8.4.RELEASE/com.myapp.hello-spring-boot/target/classes started by john doe in /Users/johndoe/Documents/workspace-sts-3.8.4.RELEASE/com.myapp.hello-spring-boot)
2017-05-02 21:28:29.454  INFO 22730 --- [           main] i.a.hellospringboot.CourseApiApp         : No active profile set, falling back to default profiles: default
2017-05-02 21:28:29.552  INFO 22730 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@5427c60c: startup date [Tue May 02 21:28:29 CDT 2017]; root of context hierarchy
2017-05-02 21:28:30.838  INFO 22730 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-05-02 21:28:30.917  INFO 22730 --- [           main] i.a.hellospringboot.CourseApiApp         : Started CourseApiApp in 2.122 seconds (JVM running for 2.614)
2017-05-02 21:28:30.919  INFO 22730 --- [       Thread-2] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@5427c60c: startup date [Tue May 02 21:28:29 CDT 2017]; root of context hierarchy
2017-05-02 21:28:30.920  INFO 22730 --- [       Thread-2] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown

UPDATE: Here is the POM.xml file:

<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>

And my GreetingController.java file:

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

@RestController
public class GreetingController {

    @RequestMapping("/hello/{name}")
      String hello(@PathVariable String name) {
        return "Hello, " + name + "!";
      }

}

Answer 1

The root cause was a corrupt jar in the maven cache. Deleting ~/.m2/repository solved the issue.

Another option would have been to run mvn dependency:purge-local-repository

Answer 2

You must add a dependency to file pom.xml :

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