Java Microservices Platform

A production-ready microservices architecture built with Spring Boot, featuring API Gateway, Service Discovery, Config Server, and multiple domain services. Demonstrates enterprise patterns, distributed systems, and cloud-native development.

Features

• API Gateway - Centralized routing and load balancing with Spring Cloud Gateway
• Service Discovery - Eureka-based service registry
• Config Server - Centralized configuration management
• User Service - Authentication and user management
• Order Service - Order processing and management
• Payment Service - Payment processing with multiple providers
• Notification Service - Email and push notifications
• Circuit Breaker - Resilience patterns with Resilience4j
• Distributed Tracing - Observability with Sleuth and Zipkin
• Database - PostgreSQL with JPA/Hibernate
• Message Queue - RabbitMQ for async communication
• Docker Support - Containerized services

Architecture

┌─────────────┐
│  API Gateway│
└──────┬──────┘
       │
   ┌───┴────┬──────────┬─────────┐
   │        │          │         │
┌──▼───┐ ┌──▼──┐ ┌─────▼──┐ ┌───▼────┐
│ User │ │Order│ │Payment │ │Notify  │
│Service│ │Service│ │Service │ │Service│
└───┬───┘ └──┬──┘ └────┬───┘ └───┬───┘
    │        │         │         │
    └────────┴─────────┴─────────┘
         Eureka Service Discovery

Tech Stack

• Java 17 - Programming language
• Spring Boot 3.x - Framework
• Spring Cloud - Microservices toolkit
• Spring Data JPA - Database access
• PostgreSQL - Database
• RabbitMQ - Message broker
• Eureka - Service discovery
• Resilience4j - Circuit breaker
• Maven - Build tool
• Docker - Containerization

Getting Started

Prerequisites

• Java 17+
• Maven 3.8+
• Docker & Docker Compose
• PostgreSQL

Build

mvn clean install

Run Services

# Start infrastructure (Eureka, Config Server, RabbitMQ)
docker-compose up -d

# Start services
java -jar gateway-service/target/gateway-service.jar
java -jar user-service/target/user-service.jar
java -jar order-service/target/order-service.jar

Project Structure

java-microservices/
├── api-gateway/          # API Gateway service
├── service-discovery/     # Eureka server
├── config-server/         # Configuration server
├── user-service/          # User management
├── order-service/         # Order processing
├── payment-service/       # Payment processing
├── notification-service/  # Notifications
├── common/               # Shared libraries
│   ├── dto/              # Data Transfer Objects
│   └── exceptions/       # Exception handlers
└── docker-compose.yml    # Infrastructure setup

License

MIT