Spring Boot Learning – REST API & CRUD with Spring Data JPA

A beginner-friendly Spring Boot project built to learn the fundamentals of backend development using Spring Boot, Spring Data JPA, and the H2 Database.

This project follows a layered architecture and implements complete CRUD (Create, Read, Update, Delete) operations for products. The code is written with detailed comments to understand the purpose of important classes, annotations, and methods.

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🚀 Features

• RESTful API development
• Complete CRUD Operations
• Spring Boot MVC
• Spring Data JPA
• Hibernate ORM
• H2 In-Memory Database
• Layered Architecture
• Lombok Integration
• Well-commented code for learning
• Maven Project

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🛠️ Tech Stack

• Java
• Spring Boot
• Spring Data JPA
• Hibernate
• H2 Database
• Maven
• Lombok

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📂 Project Structure

src
├── main
│   ├── java
│   │   └── com.bappy.webApp
│   │       ├── Controller
│   │       ├── Service
│   │       ├── Repo
│   │       ├── Model
│   │       └── WebAppApplication.java
│   └── resources
│       └── application.properties
└── test

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📌 CRUD APIs

Method	Endpoint	Description
GET	/products	Get all products
GET	/product/{id}	Get product by ID
POST	/product	Create a new product
PUT	/product	Update an existing product
DELETE	/product/{id}	Delete a product

Endpoint names may vary slightly depending on the controller implementation.

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🗄️ Database

This project uses the H2 In-Memory Database for development and learning.

Configuration is available in:

src/main/resources/application.properties

H2 Console:

http://localhost:8080/h2-console

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▶️ Running the Project

Clone the repository

git clone https://github.com/bappy-mallick/springboot-learning.git

Navigate into the project

cd springboot-learning

Run the application

./mvnw spring-boot:run

or simply run the project from your IDE.

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📚 Concepts Practiced

• Spring Boot Fundamentals
• REST APIs
• Controllers
• Services
• Repository Layer
• Dependency Injection
• Spring Beans
• Spring Data JPA
• Hibernate ORM
• Entity Mapping
• CRUD Operations
• H2 Database
• Maven Project Structure
• Lombok

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🎯 Purpose

This repository is a personal learning project created to understand backend development with Spring Boot.

The primary goal is to build a strong foundation before developing larger backend projects such as an E-commerce Backend and other production-ready applications.

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👨‍💻 Author

Bappy Mallick

GitHub: https://github.com/bappy-mallick

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