Springboot Web Hello World with a Java & Pom.xml file

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This blog presents instructions on how to quickly get started with Springboot Hello World with just one Java file and a Pom.xml.

Before getting set up with files, make sure you have installed and configured following

  • Java; Setup Java_Home as it is required by maven
  • Maven; Maven would be used to package our app.

 

Java Code Sample

Following is the code for Java file. Make sure to create hello/HelloController.java file within src/main/java. This is required for maven to package it correctly.

package hello;

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

import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.web.bind.annotation.*;

@RestController
@SpringBootApplication
public class HelloController {

    @RequestMapping("/")
    String home() {
        return "Hello World!";
    }

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

}

 

Code Sample for POM.xml

Following is the code for pom.xml. Make sure to put pom.xml at the topmost level (along side src folder)

<?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>hello</groupId>
    <artifactId>SpringBootSampleWeb</artifactId>
    <version>0.0.1</version>
	<properties>
	    <!-- The main class to start by executing java -jar -->
	    <start-class>hello.HelloController</start-class>
	</properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.0.RELEASE</version>
    </parent>

    <!-- Additional lines to be added here... -->
    <dependencies>
	    <dependency>
	        <groupId>org.springframework.boot</groupId>
	        <artifactId>spring-boot-starter-web</artifactId>
	    </dependency>
	</dependencies>
	<build>
	    <plugins>
	        <plugin>
	            <groupId>org.springframework.boot</groupId>
	            <artifactId>spring-boot-maven-plugin</artifactId>
	        </plugin>
	    </plugins>
	</build>
</project>
Package and Run the App

Once you have created the file, execute the following command to run the code:

mvn package
java -jar target/SpringBootSampleWeb-0.0.1.jar
Ajitesh Kumar

Ajitesh Kumar

Ajitesh is passionate about various different technologies including programming languages such as Java/JEE, Javascript, PHP, .NET, C/C++, mobile programming languages etc and, computing fundamentals such as application security, cloud computing, API, mobile apps, google glass, big data etc.Recently, he has been digging deep into the field of data science and machine learning.

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Ajitesh Kumar

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