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Selected Work · 2026

Online Shopping & Supply Chain System

Enterprise Java Desktop Application with 3-Tier Layered Architecture, MySQL Persistence, Multi-Role Fulfillment & Automated Financial Ledger.

Role Lead Desktop Software Architect
Architecture 3-Tier Layered & DAO Pattern
Stack Java SE · Swing & AWT · MySQL
Module / Context KDU OOP Sem 2 · ACID Database

Project Overview

The Online Shopping & Supply Chain Management System is an enterprise-grade desktop software platform engineered using Java and MySQL for General Sir John Kotelawala Defence University (KDU). The system unifies three critical commercial stakeholders—Customers, Suppliers, and Administrators—into a tightly synchronized, event-driven workflow managing the end-to-end commerce lifecycle from product discovery to logistics fulfillment and automated returns.

Key Highlights

3-Tier Layered DAO Architecture: Decouples Java Swing Presentation, DAO Business Services (ProductDao, PurchaseDao, CategoryDao, UserDao, SupplierDao), and MySQL Persistence via JDBC.
3-Role Coordinated Workflows: Multi-role authentication with dynamic radio switching, real-time executive KPI metrics, live stock reservation, and POS invoice printing via Java Print API.
Finite State Machine & Returns Engine: 4-stage order lifecycle (Pending → On The Way → Received → Refunded) featuring double-click delivery completion and automated 30-day millisecond-delta refund calculations.

Visual Showcase

Multi-Role Authentication & Enterprise Admin Control Center
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Multi-Role Authentication & Enterprise Admin Control Center

Unified role-based access for Customers, Suppliers, and Admins alongside real-time business KPIs, category CRUD, and inventory dispatching.

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