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Spring(boot)ing to the Web With Java and Pom.xml

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Spring(boot)ing to the Web With Java and Pom.xml

Following along as one developer shows you how to set up an app with Spring Boot using some Java and a single Pom.xml file.

· Java Zone
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What every Java engineer should know about microservices: Reactive Microservices Architecture.  Brought to you in partnership with Lightbend.

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

Image title

Before getting to the files, make sure you have installed and configured the following:

  • Java: Set up Java_Home, as it is required by Maven.
  • Maven: Maven would be used to package our app.

Java Code Sample

Below is the code for the 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);
    }

}

 

Pom.xml Code Sample

The following is the code for the Pom.xml file. Make sure to put Pom.xml at the topmost level (alongside the 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 

Microservices for Java, explained. Revitalize your legacy systems (and your career) with Reactive Microservices Architecture, a free O'Reilly book. Brought to you in partnership with Lightbend.

Topics:
java ,spring boot

Published at DZone with permission of Ajitesh Kumar, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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