🏦 Banking Activity Simulation - Backend API

A high-performance Java-based Banking API built with the Spark Framework. This repository serves as the core engine for banking operations, providing a RESTful interface for account management and real-time security notifications.

🚀 Backend Key Features

• RESTful API: Provides endpoints for Account Creation, Deposits, Withdrawals, and Transfers.
• Real-time Email Alerts: Automated low-balance triggers ($1000 limit) that notify users via Gmail SMTP.
• Fast Data Processing: Utilizes Gson for high-speed JSON serialization and SparkJava for lightweight request handling.
• In-Memory Storage: Uses a thread-safe Concurrent Repository for local data persistence during simulation.

🛠️ Tech Stack

• Language: Java 21
• Framework: Spark Framework (SparkJava)
• JSON Library: Google Gson
• Communication: Jakarta Mail for SMTP
• Build Tool: Maven

📂 Project Structure (Maven Standard)

• src/main/java/com/bank/BankSimulator/ApiServer.java: Main server entry point and route definitions.
• .../model/Account.java: Account data model using BigDecimal for financial accuracy.
• .../repository/AccountRepository.java: In-memory data management.
• .../util/EmailUtil.java: SMTP utility for sending real-time alerts.

💻 How to Run Locally

1. Clone the repository.
2. Ensure Maven is installed and run mvn clean install to sync dependencies.
3. Run ApiServer.java as a Java Application.
4. The server will start locally on http://localhost:8080.# banking-simulator