E383ace383bce38388e383aae3839fe38383e38388 Articles

How to Implement API Rate Limiting in Spring Boot - Limiting Request Count with Bucket4j and Filter

Step-by-step guide to implementing rate limiting per IP and per API key from scratch by combining Bucket4j with Spring Boot's Servlet Filter. Covers how to return HTTP 429 on limit exceeded, and clarifies the differences in use cases compared to Resilience4j @RateLimiter.

2026-05-07