This project demonstrates a modular and scalable Spring Boot-based microservices architecture simulating a basic e-commerce system. It includes three core services working together to manage products, handle orders, and check inventory — all routed through a secured API Gateway.

Manages product information including:

• Adding new products
• Updating product details
• Listing available products
• Uses MongoDB as the database, managed via Docker

Handles stock management:

• Checks inventory status for requested products
• Updates stock on successful order placement
• Uses MySQL as the database

Processes customer orders:

• Receives order requests from the client
• Validates product availability via Inventory Service
• Confirms and stores the order if inventory is sufficient
• Uses MySQL as the database
• Uses Resilience4j for circuit breaker pattern to ensure fault tolerance

• Central entry point for all client interactions
• Built using Spring Cloud Gateway
• Secured using OAuth2 authentication
• Routes requests to the appropriate microservices
• Uses Spring Cloud OpenFeign to simplify and abstract service-to-service communication

1. Client sends a POST request to place an order.
2. The request first goes through the API Gateway.
3. The Order Service receives the request, then performs a nested REST call to the Inventory Service using OpenFeign.
4. If inventory is available, the order is confirmed and saved.
5. All services are registered with Eureka and communicate internally using OpenFeign Clients.