Java Reactive libraries

Open-source Java projects categorized as Reactive libraries
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Top 5 Java Reactive library Projects

Reactive libraries

  1. RxJava

    RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

  2. Stream

    Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

    Stream logo

  3. reactor-core

    Non-Blocking Reactive Foundation for the JVM

    Project mention: About Micrometer Context Propagation | dev.to | 2025-02-07

    Reactor provides an implementation called ReactorContextAccessor.

  4. Reactive Streams

    Reactive Streams Specification for the JVM

    Project mention: Entendendo Back Pressure: O Semáforo dos Seus Sistemas Distribuídos | dev.to | 2025-06-20

  5. rsocket-java

    Java implementation of RSocket

  6. Mutiny

    An Intuitive Event-Driven Reactive Programming Library for Java

  7. 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
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 Reactive libraries related posts

  • Entendendo Back Pressure: O Semáforo dos Seus Sistemas Distribuídos

    1 project | dev.to | 20 Jun 2025

  • Broadcom/Spring refuses merging pull requests from Russian developers

    2 projects | news.ycombinator.com | 7 Nov 2024

  • Broadcom/Spring refuses merging pull requests from Russian developers

    1 project | news.ycombinator.com | 7 Nov 2024

  • Reactive Programming with Spring Boot and Web Flux

    2 projects | dev.to | 20 Jun 2024

  • Why Ruby's Timeout is dangerous (and Thread.raise is terrifying) (2015)

    4 projects | news.ycombinator.com | 3 Jun 2024

  • RSocket – An alternative to gRPC with first-class browser support

    1 project | news.ycombinator.com | 9 Jan 2024

  • Is it wrong to use "try-catch" inside a reactive stream operator (project reactor)?

    2 projects | /r/learnprogramming | 10 Dec 2023
  • A note from our sponsor - InfluxDB
    www.influxdata.com | 14 Jul 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 Reactive library projects in Java? This list will help you:

# Project Stars
1 RxJava 48,212
2 reactor-core 5,110
3 Reactive Streams 4,842
4 rsocket-java 2,375
5 Mutiny 862

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Stream - Scalable APIs for Chat, Feeds, Moderation, & Video.
Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
getstream.io

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