🧩 DrodXAuctionBid - Distributed Online Auction System

DrodXAuctionBid is a scalable, modular, and database-free Distributed Online Auction System developed using Java EE technologies such as EJB, JMS, and WebSocket (Payara). It simulates real-time bidding scenarios with support for manual and auto-bidding, designed for academic, enterprise learning, and demonstration purposes.

🎯 Project Overview

• Real-time product views
• Manual and auto-bid functionalities
• Live bid updates via WebSocket
• Centralized in-memory data storage for users and products

The system uses Message-Driven Beans for asynchronous processing and Singleton Session Beans for centralized product and user management.

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🛠️ Technologies Used

• Java 11

• Jakarta EE / Java EE

  • EJB (Stateless and Singleton Session Beans)
  • Message-Driven Beans (MDB)
  • JMS (Java Messaging Service)
  • Servlets
  • WebSocket (Payara Server)

• Gson (for JSON parsing)

• Payara Server (with OpenMQ for JMS)

• HTML, CSS, JavaScript for frontend

• In-memory collections simulate persistence (no external database)

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📦 Architecture

Client (Browser)
      ↓
Web Tier (Servlet + HTML/JS/CSS)
      ↓
EJB Tier (Business Logic with Session Beans)
      ↓
Core Module (DTOs, Static Repositories)

JMS is used for real-time communication between bidding components, and WebSocket updates clients instantly.

📂 Module Structure

DrodXAuctionBid/
├── core/           # DTOs, Static data
├── ejb/            # EJBs (Session Beans, Bid Manager, AutoBid Manager)
├── web/            # HTML pages, Servlets, WebSocket endpoints
├── ear/            # EAR module with application.xml
└── README.md

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✨ Key Features

🔐 User Management

• Registration and login using session beans
• Data stored in-memory without a database

🛍️ Product Catalog

• Products loaded statically using shared lists
• No external DB dependency

⚙️ Bidding System

• Manual bids processed with concurrency safety
• Auto-bidding engine that increments automatically up to a user's max limit

⏱️ Real-time Bidding with JMS + WebSocket

• JMS topics broadcast bid updates
• Web clients receive instant updates via WebSocket

🔄 Bid Prioritization

• Manual bids temporarily pause auto-bids
• Queue-based bid handling ensures fairness and order

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🔧 How to Run

1. Clone the repository:

git clone https://github.com/DisanduRodrigo/DrodXAuctionBid.git

2. Use JDK 11.
3. Import as a Maven multi-module project in IntelliJ or Eclipse.
4. Deploy the EAR module to Payara Server.
5. Access via browser: http://localhost:8080/DrodXAuctionBid-web

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🖼️ Screenshots

Login Page

Register Page

Home Page

Bidding Page

📜 License

This project is licensed under the MIT License. See LICENSE.md for details.

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