URL Shortener

A minimal Spring Boot service to shorten long URLs and redirect them efficiently using PostgreSQL and Redis.

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Tech Stack

• Java 17, Spring Boot (no Spring Data)
• PostgreSQL for persistence
• Redis (Jedis) for caching and maintaining key pool
• HikariCP for DB connection pooling

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Features

• Converts long URLs into short keys
• 302 redirects for short URLs
• Redis caching for performance
• Retry logic for key collisions
• Clean separation: Controller → Service → Repository

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Usage

1. Configure application.properties with DB and Redis.

2. Start PostgreSQL and Redis.

3. Run the app:

   mvn spring-boot:run

4. Use POST /api/shorten and GET /{shortKey} to shorten and resolve URLs.

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Next Steps

• Add logging
• Add authentication to APIs
• Docker support