Spring boot REST: Hello World Application

Below snippet creates simple REST endpoint to home page.

@RestController

public class HomeController {

    @RequestMapping("/")

    public String home() {

        return "Hello World";

    }

}

Step 1: Create new maven project ‘springRest’.

Step 2: Update pom.xml for maven dependencies.

pom.xml

<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>springRest</groupId>
  <artifactId>springRest</artifactId>
  <version>1</version>
  
  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
    </parent>

    <name>springbootApp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>

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

    </dependencies>
</project>

Step 3: Define App.java like below.

App.java

package com.sample.app;

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

@SpringBootApplication
public class App {
  public static void main(String[] args) {

    SpringApplication.run(App.class, args);

  }
}

Step 4: Define HomeController like below.

HomeController.java

package com.sample.app.cotroller;

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

@RestController
public class HomeController {

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

Total project structure looks like below.

Run App.java.

Open the url ‘http://localhost:8080/’ in browser, you can see below kind of screen.

You can download complete working application from this link.

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