Finance Service - Spring Boot Microservices: A Finance Domain Microservices Application built using Spring Boot & Spring Cloud, implementing real-world backend architecture with clean design principles.

Architecture: Eureka Server → Service Discovery API Gateway → Centralized Routing User Service → User Management Wallet Service → Wallet Operations Transaction Service → Money Transfer

Tech Stack: Java 17 Spring Boot Spring Cloud Eureka Server Spring Cloud Gateway OpenFeign MySQL Maven

Features: Microservices Architecture API Gateway Routing Service Discovery using Eureka Inter-service Communication (Feign Client) Wallet Credit/Debit System Transaction Processing Global Exception Handling Standard API Response Structure

How to Run: Start Eureka Server Start User Service Start Wallet Service Start Transaction Service Start API Gateway

Project Versions: Demo-Finance-Working-Project: Basic working microservices implementation

Finance-Microservice-Standard-API: Global Exception Handling Standard API Response Improved error handling Cleaner architecture

Finance-Microservice-DTO-Architecture: DTO Layer Implementation Mapper Pattern Secure API responses (no entity exposure) Better separation of concerns

Finance-Microservice-JWT-Login: Implemented login API for user authentication Generated JWT token upon successful login Token contains user identity (email) Used for securing microservices in next phase

API Gateway: Base URL: http://localhost:8080

API Endpoints: User Service: POST - http://localhost:8080/api/users/register GET - http://localhost:8080/api/users/{id}

Wallet Service: POST - http://localhost:8080/api/wallet/create/{userId} GET - http://localhost:8080/api/wallet/{userId} POST - http://localhost:8080/api/wallet/credit/{userId}/{amount} POST - http://localhost:8080/api/wallet/debit/{userId}/{amount}

Transaction Service: POST - http://localhost:8080/api/transactions/send?senderId={id}&receiverId={id}&amount={amount} GET - http://localhost:8080/api/transactions/sent/{userId} GET - http://localhost:8080/api/transactions/received/{userId}

Request & Response: User Registration: Request: { "name": "User", "email": "user@gmail.com", "password": "1234", "phone": "9876543210" } Response: { "status": "SUCCESS", "message": "User registered successfully", "data": { "userId": 1, "name": "User", "email": "user@gmail.com" } }

Future Enhancements: JWT Authentication Circuit Breaker (Resilience4j) Config Server Distributed Tracing (Zipkin)

Author: Kishore Kumar R

Notes: This project demonstrates: Real-world microservices architecture Clean code practices Scalable backend design