ChatAPP

A simple chat application with a Spring Boot backend and React frontend.

Features

• Chat interface with a virtual assistant
• Real-time message display
• Error handling
• Responsive design for mobile and desktop

Technology Stack

Backend

• Java 17
• Spring Boot 3.5.3
• LangChain4j with Google AI Gemini integration

Frontend

• React 18
• Axios for API communication
• CSS for styling

Project Structure

ChatAPP/
├── src/
│   ├── main/
│   │   ├── frontend/         # React frontend
│   │   ├── java/             # Java backend
│   │   └── resources/        # Application properties
│   └── test/                 # Test files
└── pom.xml                   # Maven configuration

Getting Started

Prerequisites

• Java 17 or higher
• Maven
• Node.js and npm (automatically installed by Maven during build)
• Google AI Gemini API key

Environment Variables

Set the following environment variable:

GEMINI_API_KEY=your_gemini_api_key

Building the Application

mvn clean install

This will:

1. Compile the Java code
2. Install Node.js and npm
3. Install frontend dependencies
4. Build the React frontend
5. Package everything into a single JAR file

Running the Application

java -jar target/ChatAPP-0.0.1-SNAPSHOT.jar

Or using Maven:

mvn spring-boot:run

The application will be available at http://localhost:8080

Development

Running the Backend Separately

mvn spring-boot:run

Running the Frontend Separately

cd src/main/frontend
npm install
npm start

The development server will start at http://localhost:3000 and proxy API requests to the backend at http://localhost:8080.

API Endpoints

• GET /api/v1/assistant/chat?message=<message> - Send a message to the assistant and get a response