🛒 Product Management API (Spring Boot + JPA + MySQL)

📌 Overview

A backend RESTful API built using Spring Boot to manage products with full CRUD operations.
This project follows clean architecture principles and uses JPA for database interaction, DTOs for data transfer, and validation for robust input handling.

---

🚀 Features

• ➕ Add Product (POST)
• 📄 Get All Products (GET)
• 🔍 Get Product by ID (GET)
• ✏️ Update Product (PUT)
• ❌ Delete Product (DELETE)
• ⚠️ Global Exception Handling
• ✅ Input Validation (@NotBlank, @Positive)
• 🔄 DTO-based Architecture (separating API & Entity)
• 📦 Structured API Responses (ApiResponse)

---

🧠 Concepts Used

• Spring Boot
• REST APIs
• JPA (Hibernate)
• DTO (Data Transfer Object)
• Validation (@Valid, constraints)
• Exception Handling (@RestControllerAdvice)
• Layered Architecture (Controller → Service → Repository)
• ResponseEntity
• JSON Processing

---

🛠️ Tech Stack

• Java
• Spring Boot
• Spring Data JPA
• MySQL
• Maven
• Postman (API testing)

---

📂 Project Structure

com.trisha.productapp
├── controller
│ └── ProductController
├── service
│ └── ProductService
├── repository
│ └── ProductRepository
├── entity
│ └── Product
├── dto
│ └── ProductDTO
├── exception
│ └── GlobalExceptionHandler
├── response
│ └── ApiResponse
└── ProductAppApplication

---

🔗 API Endpoints

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

---

📥 Sample Request

➕ Add Product

{
  "name": "Laptop",
  "price": 50000
}

📤 Sample Response

{
  "status": 201,
  "message": "Product created successfully",
  "data": {
    "id": 1,
    "name": "Laptop",
    "price": 50000
  },
  "timestamp": "2026-04-23T16:30:00"
}

---

⚙️ How to Run

• Clone the repository:

    git clone https://github.com/your-username/product-management-system-java.git

• Open in IntelliJ / any IDE
• Configure MySQL in application.properties
• Run:

   mvn spring-boot:run

---

🎯 Learning Outcomes

• Built a real-world backend application using Spring Boot
• Implemented clean layered architecture
• Used JPA for database persistence (no manual SQL)
• Applied DTO pattern for secure and flexible API design
• Added validation for reliable input handling
• Designed structured and consistent API responses
• Handled exceptions globally for better error management

---

🚀 Future Improvements

• Add Swagger for API documentation
• Implement pagination and filtering
• Add authentication (Spring Security + JWT)
• Deploy application (Render / AWS)

---

👩‍💻 Author

Trisha Kammati