Java Backend

A reference implementation using Spring Boot 3, running on port 8080.

Quick Start

cd server/java
./mvnw spring-boot:run

Server runs at http://localhost:8080.

Framework

• Runtime: Java 17+
• Framework: Spring Boot 3
• Port: 8080 (override with PORT)

Endpoints

Implements the shared API endpoints:

• GET /api/captcha — generate captcha image
• POST /api/captcha/verify — verify captcha
• GET /api/health — health check
• GET /api/info — server info
• GET/POST/DELETE /api/security/* — IP blacklist management

Environment Variables

See the shared environment variables. Java defaults: PORT=8080, HOST=localhost.

TIP

This is a reference implementation, not a published package. Copy the code you need into your own Spring Boot project.