Java Asynchronous

Open-source Java projects categorized as Asynchronous
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Top 18 Java Asynchronou Projects

Asynchronous

  1. transmittable-thread-local

    📌 a missing Java std lib(simple & 0-dependency) for framework/middleware, provide an enhanced InheritableThreadLocal that transmits values between threads even using thread pooling components.

  2. InfluxDB

    InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

    InfluxDB logo

  3. lettuce

    Advanced Java Redis client for thread-safe sync, async, and reactive usage. Supports Cluster, Sentinel, Pipelining, and codecs.

    Project mention: How TBMQ Uses Redis for Reliable P2P MQTT Messaging | dev.to | 2025-02-13

    To overcome this limitation, we migrated to Lettuce, an asynchronous Redis client built on top of Netty. With Lettuce, our throughput increased to 60k msg/s, demonstrating the benefits of non-blocking operations and improved parallelism.

  4. reactor-core

    Non-Blocking Reactive Foundation for the JVM

    Project mention: Everything You Need to Know about asynchronous programming along with Kotlin + Spring WebFlux | dev.to | 2025-07-26

    Project Reactor

  5. Awaitility

    Awaitility is a small Java DSL for synchronizing asynchronous operations

    Project mention: Testing MongoDB Atlas Search Java Apps Using TestContainers | dev.to | 2025-04-24

    We also used the nice awaitility library to await the READY status on the MongoDB Atlas Search index. This is important because you can’t use the index until it has fully indexed all the data. In this case, we are inserting the data first and then adding the index, so once it is READY, we can be sure all the data can be searched.

  6. atmosphere

    Event Driven WebSockets Framework with Cross-Browser Fallbacks (by Atmosphere)

  7. ea-async

    EA Async implements async-await methods in the JVM.

  8. cyclops-react

    An advanced, but easy to use, platform for writing functional applications in Java 8. (by aol)

  9. Sevalla

    Deploy and host your apps and databases, now with $50 credit! Sevalla is the PaaS you have been looking for! Advanced deployment pipelines, usage-based pricing, preview apps, templates, human support by developers, and much more!

    Sevalla logo

  10. Mutiny

    An Intuitive Event-Driven Reactive Programming Library for Java

  11. webtau

    WebTau (web test automation) is a testing API, command line tool and a framework to write unit, integration and end-to-end tests. Test across REST-API, WebSocket, GraphQL, Browser, Database, CLI and Business Logic with a consistent set of matchers and concepts. REPL mode speeds-up tests development. Rich reporting cuts down investigation time.

  12. Firefly

    Firefly is an asynchronous web framework for rapid development of high-performance web application. (by hypercube1024)

  13. rupy

    HTTP App. Server and JSON DB - Shared Parallel (Atomic) & Distributed

    Project mention: A low power 1U Raspberry Pi cluster server for inexpensive colocation | news.ycombinator.com | 2025-07-23

    I built the cluster thick instead: https://github.com/tinspin/rupy

    And selfhost on home fiber.

    Saves space and cools better.

    Mixing old 2 and 4 for different use cases.

    Raspberry 5 and 3588 are too hot.

  14. conditional

    A super lightweight library that helps you to compose multiple conditional expressions and make them asynchronous easily.

  15. rqueue-task-exector

    Rqueue Task Executor Sample app

  16. Composer

    Library for composability of interdependent non-blocking I/O tasks (by krupalshah)

  17. safeql

    Composable / async / functional / type-safe / parallel-pipelined queries and relations without SQL injection or N+1s. (by karmakaze)

  18. vertx-async-to-sync

    Consume an async api (with callback) from sync endpoint using vert.x

  19. chain-z

    Asynchronous execution made simple

  20. OpenLoom

    🧵 OpenLoom — Smart & speedy Java file reader with async, streaming, and zero config!

    Project mention: 🚀 Introducing: OpenLoom – Lightweight Java Library for File Reading (Sync & Async) | dev.to | 2025-06-20

    🔗 GitHub: https://github.com/raghul-tech/OpenLoom

  21. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    SaaSHub logo
NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).

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Java Asynchronous related posts

  • A low power 1U Raspberry Pi cluster server for inexpensive colocation

    2 projects | news.ycombinator.com | 23 Jul 2025

  • Node.js + ioredis + elasticache

    1 project | dev.to | 4 Dec 2024

  • What Kind of Asynchronous Is Right for You?

    1 project | news.ycombinator.com | 17 Jun 2023

  • An unknown Swedish startup’s €3B bid to build a green rival to AWS

    1 project | news.ycombinator.com | 10 Jun 2023

  • Redis Cluster with heavy write application results in bad redis read latency

    1 project | /r/redis | 5 Jun 2023

  • WebTau 1.52 release, now with WebSocket and Lazy HTTP response values

    1 project | /r/java | 18 Apr 2023

  • Relearning Java Thread Primitives

    1 project | dev.to | 11 Apr 2023
  • A note from our sponsor - InfluxDB
    www.influxdata.com | 1 Sep 2025
    InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now. Learn more →

Index

What are some of the best open-source Asynchronou projects in Java? This list will help you:

# Project Stars
1 transmittable-thread-local 8,112
2 lettuce 5,628
3 reactor-core 5,131
4 Awaitility 3,953
5 atmosphere 3,721
6 ea-async 1,411
7 cyclops-react 1,327
8 Mutiny 872
9 webtau 376
10 Firefly 297
11 rupy 146
12 conditional 64
13 rqueue-task-exector 27
14 Composer 18
15 safeql 14
16 vertx-async-to-sync 12
17 chain-z 3
18 OpenLoom 1

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InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com
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