Show HN: Java/Spring Boot Idempotency Library https://ift.tt/sxZNCiy

Show HN: Java/Spring Boot Idempotency Library Idempotency4j is a Java idempotency library with pluggable storage backends and Spring Web / Spring Boot support. This library solves the problem of ensuring that sensitive endpoints do not trigger side-effects multiple times - this is especially useful for any endpoints that handle financial operations. Currently, the library supports Spring MVC (Servlet-based) applications and MySQL and PostgreSQL with jdbc regarding storage backends. It is very simple to integrate, all that you have to do is add @Idempotent to any endpoints that need idempotency. Full explanation of the functionalities and configuration is available in the readme of the repository. Repository : https://ift.tt/gdxnHSi I would love any feedback or review regarding the implementation - also, any recommendation is welcome. https://ift.tt/gdxnHSi May 12, 2026 at 01:23AM