Java Vanilla

Overview

Java Vanilla is a plain Java project using only the standard library and a lightweight HTTP server. It provides a clean starting point for building web applications and REST APIs without any framework overhead.

Quick Start

git clone https://<git-server>/<username>/<repo-name>.git
cd <repo-name>

mvn clean package

java -jar target/app.jar

git add .
git commit -m "Initial setup"
git push origin main

Local Development with Docker

If you don't have Java or Maven installed locally, you can use Docker to build and run your project.

Running Commands with Docker

# Build the project
docker run --rm -v $(pwd):/app -w /app maven:3-eclipse-temurin-21 mvn clean package

# Run the application
docker run --rm -v $(pwd):/app -w /app -p 8080:8080 eclipse-temurin:21 java -jar target/app.jar

Project Structure

├── src/
│   └── main/
│       └── java/
│           └── com/example/
│               ├── App.java              # Entry point & HTTP server
│               ├── handlers/             # Request handlers
│               └── models/               # Data models
├── pom.xml                               # Maven dependencies
└── Dockerfile                            # Docker config
        

Common Tasks

Creating an HTTP Handler

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import java.io.IOException;
import java.io.OutputStream;

public class UsersHandler implements HttpHandler {
    @Override
    public void handle(HttpExchange exchange) throws IOException {
        String response = "{\"message\": \"Hello from Java!\"}";
        exchange.getResponseHeaders().set("Content-Type", "application/json");
        exchange.sendResponseHeaders(200, response.length());
        try (OutputStream os = exchange.getResponseBody()) {
            os.write(response.getBytes());
        }
    }
}

Database Connection with JDBC

import java.sql.*;

String url = "jdbc:mysql://db.<session-domain>:3306/<username>";
Connection conn = DriverManager.getConnection(url, "username", "password");

PreparedStatement stmt = conn.prepareStatement("SELECT * FROM users WHERE id = ?");
stmt.setInt(1, userId);
ResultSet rs = stmt.executeQuery();

Useful Commands

Troubleshooting

Deployment Workflow