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Blog Platform - Microservices Architecture

A modern, scalable blog platform built with microservices architecture using Spring Boot, Spring Cloud, and React.

🏗️ Architecture Overview

This project implements a microservices architecture with the following components:

┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐
│   React Frontend│    │   API Gateway   │    │  Eureka Server  │
│    (Port 5173)  │◄──►│   (Port 8084)   │◄──►│   (Port 8761)   │
└─────────────────┘    └─────────────────┘    └─────────────────┘
                                │
                ┌───────────────┼───────────────┐
                │               │               │
        ┌───────▼──────┐ ┌──────▼──────┐ ┌─────▼──────┐
        │ User Service │ │ Blog Service│ │ Engagement │
        │ (Port 8081)  │ │ (Port 8082) │ │   Service  │
        └──────────────┘ └─────────────┘ │ (Port 8083)│
                                         └────────────┘
                                │
                        ┌───────▼──────┐
                        │ Notification │
                        │   Service    │
                        │ (Port 8085)  │
                        └──────────────┘

🚀 Services

1. Eureka Server (Port 8761)

  • Purpose: Service discovery and registration
  • Technology: Spring Cloud Netflix Eureka
  • Features:
    • Service registry for all microservices
    • Health monitoring and load balancing
    • Automatic service discovery

2. API Gateway (Port 8084)

  • Purpose: Single entry point for all client requests
  • Technology: Spring Cloud Gateway
  • Features:
    • Request routing to appropriate microservices
    • JWT authentication and authorization
    • CORS configuration
    • Rate limiting and security filters

3. User Service (Port 8081)

  • Purpose: User management and authentication
  • Technology: Spring Boot, Spring Security, JPA
  • Features:
    • User registration and login
    • JWT token generation and validation
    • User profile management
    • Role-based access control

4. Blog Service (Port 8082)

  • Purpose: Blog content management
  • Technology: Spring Boot, Spring Data JPA
  • Features:
    • Create, read, update, delete blog posts
    • Blog categorization and tagging
    • Content validation and sanitization
    • Author-based blog management

5. Engagement Service (Port 8083)

  • Purpose: User interactions with blog content
  • Technology: Spring Boot, Spring Data JPA
  • Features:
    • Comments: Nested commenting system with up to 5 levels deep
    • Likes: Toggle like/unlike functionality
    • Views: Anonymous and authenticated view tracking
    • Real-time engagement statistics

6. Notification Service (Port 8085)

  • Purpose: Email notifications and event-driven messaging
  • Technology: Spring Boot, Spring Mail, Apache Kafka
  • Features:
    • Email Notifications: Automated email sending via Gmail SMTP
    • Event Processing: Kafka consumer for real-time event handling
    • Blog Notifications: New blog post alerts to followers
    • Engagement Alerts: Milestone notifications (likes, comments, views)
    • User Registration: Welcome emails for new users
    • Configurable Templates: Customizable email templates
    • Rate Limiting: Configurable email sending limits
    • Health Monitoring: Comprehensive health checks and metrics

7. Frontend Application (Port 5173)

  • Purpose: User interface for the blog platform
  • Technology: React 19, Vite, TailwindCSS
  • Features:
    • Responsive modern UI design
    • User authentication and registration
    • Blog creation and management
    • Interactive comment system with nested replies
    • Real-time engagement features
    • Admin dashboard

🛠️ Technology Stack

Backend

  • Framework: Spring Boot 3.5.4
  • Cloud: Spring Cloud 2025.0.0
  • Database: MySQL
  • Security: Spring Security + JWT
  • Service Discovery: Netflix Eureka
  • API Gateway: Spring Cloud Gateway
  • Configuration Management: Spring Cloud Config Server
  • Message Queue: Apache Kafka
  • Email Service: Spring Mail (Gmail SMTP)
  • Build Tool: Maven
  • Java Version: 24

Frontend

  • Framework: React 19.1.1
  • Build Tool: Vite 7.1.0
  • Styling: TailwindCSS 4.1.11
  • HTTP Client: Axios 1.11.0
  • Routing: React Router DOM 7.8.0
  • Form Handling: React Hook Form 7.62.0
  • Validation: Zod 4.0.17
  • Icons: Lucide React 0.539.0

📋 Prerequisites

  • Java 24 or higher
  • Node.js 18 or higher
  • MySQL 8.0 or higher
  • Maven 3.8 or higher
  • Apache Kafka (for notification service)
  • Git

🚀 Quick Start

1. Clone the Repository

git clone <repository-url>
cd MSA/project

2. Database Setup

Create MySQL databases for each service:

CREATE DATABASE user_service_db;
CREATE DATABASE blog_service_db;
CREATE DATABASE engagement_service_db;

3. Start Apache Kafka (Required for Notification Service)

# Start Zookeeper
bin/zookeeper-server-start.sh config/zookeeper.properties

# Start Kafka Server
bin/kafka-server-start.sh config/server.properties

4. Start Services (Recommended Order)

Step 1: Start Eureka Server

cd eureka-server
mvn spring-boot:run

Wait for Eureka to start completely (check http://localhost:8761)

Step 2: Start API Gateway

cd api-gateway
mvn spring-boot:run

Step 3: Start Microservices (can be started in parallel)

# Terminal 1
cd user-service
mvn spring-boot:run

# Terminal 2
cd blog-service
mvn spring-boot:run

# Terminal 3
cd engagement-service
mvn spring-boot:run

# Terminal 4
cd notification-service
mvn spring-boot:run

Step 4: Start Frontend

cd blog-frontend
npm install
npm run dev

5. Access the Application

🔧 Configuration

Environment Variables

Each service can be configured using the following environment variables:

# Database Configuration
DB_HOST=localhost
DB_PORT=3306
DB_NAME=<service_db_name>
DB_USERNAME=root
DB_PASSWORD=<your_password>

# JWT Configuration
JWT_SECRET=<your_jwt_secret>
JWT_EXPIRATION=86400000

# Service Ports
EUREKA_PORT=8761
GATEWAY_PORT=8084
USER_SERVICE_PORT=8081
BLOG_SERVICE_PORT=8082
ENGAGEMENT_SERVICE_PORT=8083
NOTIFICATION_SERVICE_PORT=8085

# Email Configuration (for Notification Service)
MAIL_USERNAME=your-email@gmail.com
MAIL_PASSWORD=your-app-password

# Kafka Configuration
KAFKA_BOOTSTRAP_SERVERS=localhost:9092

Application Properties

Key configuration files:

  • eureka-server/src/main/resources/application.properties
  • api-gateway/src/main/resources/application.properties
  • user-service/src/main/resources/application.properties
  • blog-service/src/main/resources/application.properties
  • engagement-service/src/main/resources/application.properties
  • notification-service/src/main/resources/application.properties
  • config-server/src/main/resources/application.properties

📚 API Documentation

Authentication Endpoints

POST /auth/register - User registration
POST /auth/login    - User login
GET  /auth/profile  - Get user profile

Blog Endpoints

GET    /blogs              - Get all blogs (paginated)
POST   /blogs              - Create new blog
GET    /blogs/{id}         - Get blog by ID
PUT    /blogs/{id}         - Update blog
DELETE /blogs/{id}         - Delete blog
GET    /blogs/user/{userId} - Get blogs by user

Engagement Endpoints

# Comments
POST   /blogs/{id}/comments           - Add comment
GET    /public/blogs/{id}/comments    - Get comments
PUT    /blogs/{id}/comments/{commentId} - Update comment
DELETE /blogs/{id}/comments/{commentId} - Delete comment

# Likes
POST   /blogs/{id}/likes/toggle       - Toggle like
GET    /blogs/{id}/likes/status       - Get like status
GET    /public/blogs/{id}/likes/count - Get like count

# Views
POST   /public/blogs/{id}/views       - Record view
GET    /public/blogs/{id}/views/count - Get view count

Notification Endpoints

# Health and Status
GET    /actuator/health              - Service health check
GET    /actuator/info                - Service information
GET    /actuator/metrics             - Service metrics

# Email Notifications (Internal)
POST   /notifications/blog-created   - Send new blog notification
POST   /notifications/milestone      - Send engagement milestone notification
POST   /notifications/user-welcome   - Send user registration welcome email

🎨 Frontend Features

User Interface

  • Responsive Design: Mobile-first approach with TailwindCSS
  • Modern UI Components: Clean, intuitive interface
  • Dark/Light Theme: User preference support
  • Real-time Updates: Live engagement statistics

Key Components

  • Authentication: Login/Register forms with validation
  • Blog Management: Create, edit, delete blog posts
  • Comment System: Nested comments with visual hierarchy
  • User Dashboard: Personal blog management
  • Admin Panel: System administration features

Comment System Features

  • Nested Structure: Up to 5 levels of comment depth
  • Visual Indicators: Color-coded depth levels
  • User Avatars: Generated gradient avatars
  • Real-time Validation: Character limits and content validation
  • Responsive Actions: Reply, edit, delete functionality

🔒 Security Features

  • JWT Authentication: Stateless authentication across services
  • Role-based Access Control: User and admin roles
  • CORS Configuration: Proper cross-origin resource sharing
  • Input Validation: Comprehensive request validation
  • SQL Injection Protection: JPA and parameterized queries

🐛 Troubleshooting

Common Issues

1. Service Discovery Issues

If services can't find each other:

# Check Eureka dashboard at http://localhost:8761
# Ensure all services are registered
# Verify hostname configuration in application.properties

2. Database Connection Issues

# Verify MySQL is running
# Check database credentials in application.properties
# Ensure databases are created

3. CORS Issues

# Check API Gateway CORS configuration
# Verify frontend is making requests to gateway (port 8084)
# Check browser developer tools for CORS errors

4. Port Conflicts

# Check if ports are already in use
netstat -an | findstr :8761
netstat -an | findstr :8084
netstat -an | findstr :8085
# etc.

5. Notification Service Issues

# Check if Kafka is running
# Verify email configuration (MAIL_USERNAME, MAIL_PASSWORD)
# Check notification service logs for email sending errors
# Verify Gmail app password is correct

📈 Monitoring and Health Checks

All services include Spring Boot Actuator for monitoring:

  • Health: /actuator/health
  • Info: /actuator/info
  • Metrics: /actuator/metrics

🤝 Contributing

  1. Fork the repository
  2. Create a feature branch (git checkout -b feature/amazing-feature)
  3. Commit your changes (git commit -m 'Add some amazing feature')
  4. Push to the branch (git push origin feature/amazing-feature)
  5. Open a Pull Request

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

  • Spring Boot and Spring Cloud communities
  • React and Vite development teams
  • TailwindCSS for the amazing styling framework
  • All contributors and maintainers

Note: This project demonstrates modern microservices architecture patterns and is suitable for learning and production use with proper security configurations.

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