Spring Boot 3 Hello World Example

In the section, we will create a project for Hello Word Example with Spring Boot.

Step 1: Creating a simple spring boot web application.

First, open the Spring initializr https://start.spring.io/ Then, Provide the Group and Artifact name. We have provided Group name com.knf.dev.demo and Artifact helloworld. Here I selected the Maven project - language Java - Spring Boot 3.0.1 and add Spring web dependency.

Then, click on the Generate button. When we click on the Generate button, it starts packing the project in a .zip(helloworld.zip) file and downloads the project.

Then, Extract the Zip file.

Step 2: Import the project on your favourite IDE, I am using IntelliJ IDEA

Final Project Directory:

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 
   https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>3.0.1</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.knf.dev.demo</groupId>
   <artifactId>helloworld</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>helloworld</name>
   <description>Demo project for Spring Boot</description>
   <properties>
      <java.version>17</java.version>
   </properties>
   <dependencies>
      <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>

HelloWorldController.java

package com.knf.dev.demo.helloworld.controller;

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

@CrossOrigin(origins = "*", maxAge = 4800)
@RestController
@RequestMapping("/api/v1/")
public class HelloWorldController {

    @GetMapping("/hello")
    public String hello() {
        return "Hello World";
    }
}

HelloworldApplication.java

package com.knf.dev.demo.helloworld;

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

@SpringBootApplication
public class HelloworldApplication {

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

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