Introduction to Spring Boot for Beginners

Spring Boot is a very impressive Java framework designed to untangle the development of stand-alone, production-grade Spring-based applications. It aims to eliminate the boilerplate configuration required when building Spring applications and provides a powerful list of defaults and auto-configuration options.

In this tutorial, we’ll cover the following topics:

  1. Setting up a Spring Boot project
  2. Creating a simple RESTful API
  3. Building and running the application
  4. Testing the API endpoints


Before getting started, ensure you have the following prerequisites:

  1. Java Development Kit (JDK) installed on your system.
  2. An Integrated Development Environment (IDE) such as IntelliJ IDEA or Eclipse.

Step 1: Setting up a Spring Boot project

To begin, let’s set up a new Spring Boot project. You can use Spring Initializr, which is a web-based tool that generates a project structure with the required dependencies.

  1. Open your web browser and go to Spring Initializer.
  2. Set the following project details:
  • Project: Maven Project
  • Language: Java
  • Spring Boot: {Choose the latest stable version}
  • Group: com.example
  • Artifact: spring-boot-demo
  • Packaging: Jar
  • Java: {Choose the Java version you have installed}
  1. Click on the “Add Dependencies” button and add the following dependencies:
  • Spring Web
  • Spring Data JPA (optional, if you plan to use a database)
  1. Click the “Generate” button to download the project as a ZIP file.
  2. Extract the downloaded ZIP file to a directory of your choice.

Step 2: Creating a simple RESTful API

In this step, we’ll create a simple RESTful API that exposes some endpoints for managing a collection of entities. Let’s assume we’re building a TODO application.

  1. Open your IDE and import the project you generated in Step 1.
  2. Create a new Java class named Todo under the com.example.demo package with the following content:
package com.example.demo;

public class Todo {
    private Long id;
    private String title;
    private boolean completed;

    // Constructors, getters, and setters
  1. Create a new Java class named TodoController under the com.example.demo package with the following content:
package com.example.demo;

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

import java.util.ArrayList;
import java.util.List;

public class TodoController {
    private List<Todo> todos = new ArrayList<>();

    public List<Todo> getAllTodos() {
        return todos;

    public Todo createTodo(@RequestBody Todo todo) {
        return todo;

    // Additional CRUD operations can be added here

Step 3: Building and running the application

Now, let’s build and run the Spring Boot application.

  1. Open a terminal or command prompt and navigate to the project’s root directory.
  2. Build the application using the following command:
mvn clean install
  1. Once the build completes successfully, run the application with the following command:
java -jar target/spring-boot-demo.jar

Step 4: Testing the API endpoints

Now that the application is up and running, let’s test the API endpoints using a tool like cURL or Postman.

  1. Open your preferred API testing tool.
  2. Send a GET request to http://localhost:8080/todos to retrieve all todos. You should receive an empty JSON array.
  3. Send a POST request to http://localhost:8080/todos with the following JSON payload to create a new todo:
    "id": 1,
    "title": "Finish tutorial",
    "completed": false
  1. Send another GET request to http://localhost:8080/todos to verify that the newly created todo is returned.

That’s it! You’ve created a simple Spring Boot application with a RESTful API.

Feel free to explore more advanced features of Spring Boot, such as connecting to a database, adding security, or implementing more complex business logic. The official Spring Boot documentation is a great resource to learn more about the framework and its capabilities.

Happy coding!

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