Spring Boot Microservices – Learning Project

A Spring Boot Microservices architecture project built for learning modern backend system design and cloud-native development.

This project demonstrates how to build a scalable microservices-based system using Spring Cloud ecosystem, event-driven architecture, and modern DevOps tools.

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Tech Stack

• Java
• Spring Boot
• Spring Cloud
• Eureka Discovery Server
• Spring Cloud Config Server
• API Gateway
• OpenFeign
• REST Template
• Apache Kafka
• Zookeeper
• Spring Actuator
• Keycloak (Authentication & Authorization)
• Docker & Docker Compose
• GitHub Actions (CI/CD)

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Architecture

This project follows a Microservices Architecture with Domain Driven Design (DDD) principles.

Core Components

• Configuration Server

  • Centralized configuration management

• Discovery Server (Eureka)

  • Service registration and discovery

• API Gateway

  • Single entry point for all services

• Customer Service

  • Manage customer data

• Product Service

  • Manage product catalog

• Order Service

  • Handle order creation and order lines

• Payment Service

  • Manage payment processing

• Notification Service

  • Send notifications and order confirmations

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Communication

The system demonstrates both synchronous and asynchronous communication.

Synchronous

• OpenFeign
• REST Template

Asynchronous

• Apache Kafka

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Security

Authentication and authorization are handled using:

• Keycloak
• Secured API Gateway
• OAuth2 / JWT based authentication

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Observability

Monitoring and tracing are implemented using:

• Spring Actuator
• Zipkin for distributed tracing

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Infrastructure

The project uses Docker & Docker Compose to run infrastructure services:

• Kafka
• Zookeeper
• Zipkin
• Keycloak
• Databases