Show HN: Java/Spring Boot Idempotency Library

Category: library

Tags: java, spring-boot, idempotency, api-reliability, distributed-systems

Score: 6.0/10 (Innovation: 4, Technical: 6, Documentation: 7, Utility: 7)

idempotency4j is a Spring Boot library that provides idempotency enforcement for HTTP APIs via annotation-based keyed request deduplication, with pluggable storage backends (JDBC, in-memory) and configurable TTL and concurrency handling. Its focus on a specific reliability pattern in distributed systems makes it practically useful for payment and order processing APIs, though it is an incremental improvement over existing idempotency solutions.

Target audience: backend devs

Repository: https://github.com/josipmusa/idempotency4j · Java · NOASSERTION · 2 stars

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