Spring Boot App Terminating at Startup

Question

I am trying out a simple spring boot application it always shuts down automatically

 :: Spring Boot ::        (v1.4.1.RELEASE)
2016-10-23 13:05:21.681  INFO 16532 --- [           main] com.example.RestBootApplication          : No active profile set, falling back to default profiles: default
2016-10-23 13:05:21.766  INFO 16532 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@6e20b53a: startup date [Sun Oct 23 13:05:21 EDT 2016]; root of context hierarchy
2016-10-23 13:05:23.682  INFO 16532 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2016-10-23 13:05:23.704  INFO 16532 --- [           main] com.example.RestBootApplication          : Started RestBootApplication in 2.632 seconds (JVM running for 5.168)
2016-10-23 13:05:23.705  INFO 16532 --- [       Thread-2] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@6e20b53a: startup date [Sun Oct 23 13:05:21 EDT 2016]; root of context hierarchy
2016-10-23 13:05:23.708  INFO 16532 --- [       Thread-2] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>rest-boot</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.1.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

Main Class

@SpringBootApplication
public class RestBootApplication {

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

Controller

@Controller
public class HelloController {

    @RequestMapping("/hello")
    String helloWorld(){
        return "helloWorld";
    }

}

Trying to run in spring tool suite. it always stops after starting. I even added "spring-boot-starter-web" after looking at some stackoverflow questions, but still facing the issue.

Please can you someone point out the issue.

Answer 1

In my case just adding following to pom file

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

Answer 2

Check what exit code you are getting.

If you get "Process finished with exit code 1" means an exception is being thrown. Thus you can put a try catch block around your SpringApplication.run() statement and print out the stack trace.

public static void main(String[] args) {
    try {
        SpringApplication.run(MyApplication.class, args);
    } catch (Exception e) {
        e.printStackTrace(); 
    }
}

Example talen from: https://stackoverflow.com/a/59017774/9531109