🛒 Spring Boot Order API with H2 and External Product Check

This is a Spring Boot REST API that simulates placing an order. Before creating an order, it checks product availability from a free public API (https://fakestoreapi.com). If the product is available, the order is saved in an in-memory H2 database.

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✅ Features

• 📦 Fetch product details from a 3rd-party API (with RestTemplate)
• ✅ Place an order if the product is available
• ❌ Return "Product not available" if out of stock
• 💾 Save order data into H2 in-memory DB
• 🔁 Uses RestTemplate for HTTP calls
• 🔧 Clean separation between Controller and Service layers
• ⚠️ Simple exception handling

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Test Evidences:

• APIs on Swagger

• Postman Request

• H2 DB console

🚀 Getting Started

🔧 Prerequisites

• Java 17+
• Spring Boot 3.x
• Spring Web
• Spring Data JPA
• H2 Database
• Lombok (optional)
• Springdoc OpenAPI (Swagger UI)

▶️ Run the App

mvn spring-boot:run

API Endpoints

POST /api/orders?productId=1&quantity=2

GET /api/orders?page=0&size=5

GET http://localhost:8080/api/ai/ask?prompt=Tell me a joke

📦 Sample JSON Response

✅ Success

{
  "id": 1,
  "productId": 1,
  "productName": "Fjallraven - Foldsack No. 1 Backpack",
  "price": 109.95,
  "createdAt": "2025-08-24T13:45:21.123"
}

❌ Product Not Available Product not available.

❌ Invalid ID or API Error Error occurred: 404 Not Found

Swagger UI

http://localhost:8080/swagger-ui.html

License

This project is licensed under the MIT License.

You have some query?

If you have some query, feel free to connect with me here -- Ranjan Kumar Mandal