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Top 5 Java Reactive library Projects
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RxJava
RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
RxJava Documentation
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Project mention: Everything You Need to Know about asynchronous programming along with Kotlin + Spring WebFlux | dev.to | 2025-07-26
Project Reactor
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Project mention: Entendendo Back Pressure: O Semáforo dos Seus Sistemas Distribuídos | dev.to | 2025-06-20
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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).
Java Reactive libraries discussion
Java Reactive libraries related posts
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Mastering Reactive Programming in Modern Mobile Development
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Everything You Need to Know about asynchronous programming along with Kotlin + Spring WebFlux
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Entendendo Back Pressure: O Semáforo dos Seus Sistemas Distribuídos
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Broadcom/Spring refuses merging pull requests from Russian developers
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Broadcom/Spring refuses merging pull requests from Russian developers
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Reactive Programming with Spring Boot and Web Flux
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Why Ruby's Timeout is dangerous (and Thread.raise is terrifying) (2015)
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A note from our sponsor - SaaSHub
www.saashub.com | 13 Jun 2026
Index
What are some of the best open-source Reactive library projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | RxJava | 48,236 |
| 2 | reactor-core | 5,223 |
| 3 | Reactive Streams | 4,873 |
| 4 | rsocket-java | 2,394 |
| 5 | Mutiny | 923 |
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