Deep Chat - Real-time Chat Application

A modern, full-stack real-time chat application built with Java Spring Boot, WebSocket, and PostgreSQL. Featuring a sleek Discord-inspired dark theme, multi-channel support, and secure authentication.

🚀 Features

• Real-time Messaging: Instant message delivery powered by WebSocket and STOMP protocol.
• Multi-Channel Support: Seamlessly switch between distinct channels (#general, #off-topic, #help) with isolated chat histories.
• Live User Tracking: See who is currently online in the sidebar.
• Secure Authentication: User registration and login protected by JWT (JSON Web Tokens).
• Persistent History: All messages are stored securely in a PostgreSQL database.
• Modern UI/UX: Responsive, dark-themed interface with custom message bubbles and avatars.
• Message Types: Handles chat messages, user join/leave events, and system notifications intelligently.

🛠️ Tech Stack

Backend

• Java 17+
• Spring Boot 3.x (Web, Security, Data JPA, WebSocket)
• Spring Security 6.x (Stateless JWT Authentication)
• PostgreSQL (Database)
• Lombok (Boilerplate reduction)

Frontend

• HTML5 & CSS3 (Custom Flexbox layouts, Variables)
• JavaScript (ES6+)
• SockJS & Stomp.js (WebSocket client)

⚙️ Prerequisites

• Java 17 or higher
• Maven 3.6+
• PostgreSQL 14+

📥 Installation & Setup

1. Clone the Repository

   git clone https://github.com/sujan58/Chat_application.git
   cd Chat_application

2. Database Configuration Ensure PostgreSQL is running and create a database named chatapp_db.

   • Default credentials are set to postgres / password.
   • Update src/main/resources/application.properties if your credentials differ:

     spring.datasource.url=jdbc:postgresql://localhost:5432/chatapp_db
     spring.datasource.username=your_username
     spring.datasource.password=your_password

3. Build the Project

   mvn clean install

4. Run the Application

   mvn spring-boot:run

   The application will start on http://localhost:8080.

🖥️ Usage

1. Open your browser and navigate to http://localhost:8080.
2. Register a new account.
3. Login with your credentials.
4. Start chatting in the #general channel or switch to others!
5. Open a second browser window (incognito) to simulate multiple users and see real-time updates.

🤝 Contributing

Contributions are welcome! Please fork the repository and submit a pull request.

📄 License

This project is licensed under the MIT License.