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Idempotency library for Java

13 starsJava

Java/Spring Boot Idempotency Library

by anaq42·May 12, 2026·4 points·1 comment
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AI Analysis

●MidShip It

Yet another idempotency library when Spring Retry already handles this.

Strengths
  • •@Idempotent annotation makes integration trivial for Spring MVC endpoint developers
  • •TTL and lock timeout configuration handles concurrent duplicate request scenarios
  • •Published on Maven Central with BOM support for version alignment
Weaknesses
  • •JDBC-only storage backends limit deployment to MySQL and PostgreSQL databases
  • •Only 2 stars with established idempotency patterns already existing in Spring ecosystem
Target Audience

Java/Spring developers building payment or order processing endpoints

Similar To

Spring Retry · Custom idempotency implementations

Post Description

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://github.com/josipmusa/idempotency4j

I would love any feedback or review regarding the implementation - also, any recommendation is welcome.

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