Spring Boot 3 Hello World Example

In this source code example, we will show you how to create a simple Spring boot Hello World REST API. We will use the Spring Boot 3 (the latest version) in this tutorial.

Technologies and tools used:

  • Spring Boot 3.0.0 (SNAPSHOT)
  • Maven 3.x
  • Java 17 or later
Note:
Spring Boot 3 needs Java 17 or later

1. Creating a Spring Boot Application

Let's use https://start.spring.io/ to quickly create and bootstrap the Spring boot project:
Spring Boot 3 Hello World Example

2. Maven Dependencies

<?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>3.0.0-SNAPSHOT</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>net.javaguides</groupId>
	<artifactId>springboot-hello-world-example</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot-hello-world-example</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>
	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<releases>
				<enabled>false</enabled>
			</releases>
		</repository>
	</repositories>
	<pluginRepositories>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</pluginRepository>
		<pluginRepository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<releases>
				<enabled>false</enabled>
			</releases>
		</pluginRepository>
	</pluginRepositories>

</project>

3. Project Directory Structure



4. Spring Boot Hello World REST API

Let's create HelloWorldController and add the following content to it:
package net.javaguides.springboot;

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

@RestController
@RequestMapping("/api/v1")
public class HelloWorldController {

    @GetMapping("/hello-world")
    public String helloWorld(){
        return "Spring Boot Hello World! Example";
    }
}

5. Run Spring Boot Application

We have successfully developed /hello-world REST API. Now it's time to deploy our application in a servlet container(embedded tomcat). 
Two ways we can start the standalone Spring boot application. 
1. From the root directory of the application and type the following command to run it -
$ mvn spring-boot:run
2. From your IDE, runSpringbootHelloWorldExampleApplicatio.main() method as a standalone Java class that will start the embedded Tomcat server on port 8080 and point the browser to http://localhost:8080/.

6. Demo

We use the Postman client tool to test the /hello-world REST API.
spring boot 3

Spring Boot Source Code Examples


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