Rale4j (Rate Limiting Enhancement for Java Devs) is a powerful, lightweight, and configurable rate-limiting library for Java applications.

✅ Simple Annotations – Just use @Rale4j to control API access for spring boot.
✅ Flexible Configuration – Customize limits via application.properties or application.yml.
✅ In-Memory & Redis Support – Choose between Guava Cache (in-memory) or Redis for distributed rate limiting.
✅ High Performance – Uses efficient algorithms like Token Bucket, Sliding Window, and Leaky Bucket.
✅ Observability – Integrates with Prometheus & Grafana for monitoring.