bucket4j/bucket4j

Health v2 · maintenance only

Adoption not part of the score

2790 stars · 326 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Bucket4j is a Java rate-limiting library based on the token-bucket algorithm, offering lock-free, high-precision integer arithmetic implementations. It supports distributed rate limiting across JVM clusters via JCache-compatible grids like Hazelcast, Ignite, and Infinispan, as well as custom backends.

Use cases

• rate limit api requests in java
• throttle requests per user in a spring boot app
• distributed rate limiting across a cluster of jvms
• implement token bucket throttling with hazelcast
• protect an endpoint from too many requests
• limit bandwidth consumption in a java service

When to choose

• you need precise, high-performance rate limiting in a JVM application
• you need clustered/distributed rate limiting backed by JCache-compatible grids or databases
• you want lock-free concurrency and low GC overhead
• you need to change rate limit configuration at runtime

When to avoid

• you need rate limiting in a non-JVM language
• you want a ready-made API gateway or proxy rather than an embedded library
• your use case is simple single-node throttling where a smaller utility would suffice

Facets

library · maturity stable

rate-limiting caching middleware backend developer-tools microservices apis jvm cross-platform token-bucket jcache hazelcast infinispan apache-ignite distributed-rate-limiting java

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