Top 23 Java Reactive Projects

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1. Quarkus

   1 144 14,495 10.0 Java

   Quarkus: Supersonic Subatomic Java.

   

   Project mention: Create a simple REST application using Quarkus | dev.to | 2025-05-07

   Quarkus is a Kubernetes-native Java stack tailored for GraalVM and OpenJDK HotSpot. Quarkus offers incredibly fast boot times, low RSS memory consumption, and a fantastic developer experience with features like live coding.

2. InfluxDB

   www.influxdata.com featured

   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.

   

3. Vert.x

   2 50 14,461 9.6 Java

   Vert.x is a tool-kit for building reactive applications on the JVM

   

   Project mention: Ash Framework – Model your domain, derive the rest | news.ycombinator.com | 2025-05-14

4. Android-RxJava

   3 0 7,535 3.0 Java

   Learning RxJava for Android by example

   

5. lettuce

   4 4 5,572 9.1 Java

   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.

6. reactor-core

   5 25 5,081 9.3 Java

   Non-Blocking Reactive Foundation for the JVM

   

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

   Reactor provides an implementation called ReactorContextAccessor.

7. helidon

   6 34 3,623 9.7 Java

   Java libraries for writing microservices

   

   Project mention: Year After Switching from Java to Go: Our Experiences | news.ycombinator.com | 2025-02-18

8. vertx-examples

   7 1 3,567 8.9 Java

   Vert.x examples

   

9. SaaSHub

   www.saashub.com featured

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

   

10. rsocket-java

    8 5 2,366 6.1 Java

    Java implementation of RSocket

    

11. Rapidoid

    9 0 1,629 0.0 Java

    Rapidoid - Extremely Fast, Simple and Powerful Java Web Framework and HTTP Server!

    

12. cyclops-react

    10 2 1,323 0.0 Java

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

    

13. vertx-web

    11 0 1,131 9.0 Java

    HTTP web applications for Vert.x

    

14. r2dbc-postgresql

    12 4 1,042 7.1 Java

    Postgresql R2DBC Driver

    

15. ServiceTalk

    13 4 959 9.5 Java

    A networking framework that evolves with your application

    

16. hilla

    14 9 957 9.7 Java

    Build better business applications, faster. No more juggling REST endpoints or deciphering GraphQL queries. Hilla seamlessly connects Spring Boot and React to accelerate application development.

    

17. Mutiny

    15 0 847 9.5 Java

    An Intuitive Event-Driven Reactive Programming Library for Java

    

18. spring-data-r2dbc

    16 1 702 0.0 Java

    Provide support to increase developer productivity in Java when using Reactive Relational Database Connectivity. Uses familiar Spring concepts such as a DatabaseClient for core API usage and lightweight repository style data access.

    

19. influxdb-client-java

    17 1 459 8.6 Java

    InfluxDB 2 JVM Based Clients

    

20. hibernate-reactive

    18 1 455 9.4 Java

    A reactive API for Hibernate ORM, supporting non-blocking database drivers and a reactive style of interaction with the database.

    

    Project mention: Java News: WildFly 36, Spring Milestones, and Open Liberty Updates | dev.to | 2025-04-15

    The third beta release of Hibernate Reactive 3.0.0 includes new methods for the StatelessSession interface and fixes for specific exceptions. More details can be found in the release notes.

21. vertx-jooq

    19 2 386 0.0 Java

    A jOOQ-CodeGenerator to create vertx-ified DAOs and POJOs.

    

22. Firefly

    20 0 296 4.8 Java

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

    

23. proteus

    21 0 189 4.4 Java

    Proteus is a blazing fast minimalist Java web server framework built atop Undertow. (by noboomu)

    

24. vertx-virtual-threads-incubator

    22 1 117 1.4 Java

    Vert.x virtual threads incubator

    

25. spring-petclinic-reactive

    23 1 83 0.0 Java

    Reactive version of Spring PetClinic sample application based on Spring Webflux and Cassandra

    

26. SaaSHub

    www.saashub.com featured

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

    

Java Reactive related posts

• Show HN: Hateoflux – A Reactive-First HATEOAS Library for Spring WebFlux

  1 project | news.ycombinator.com | 3 Dec 2024

• hateoflux VS spring-hateoas - a user suggested alternative

  2 projects | 3 Dec 2024

• Error handlers and failure handlers in Vert.x

  2 projects | dev.to | 22 Nov 2024

• 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

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

  2 projects | /r/learnprogramming | 10 Dec 2023

• Modern Async Primitives on iOS, Android, and the Web

  4 projects | dev.to | 6 Dec 2023
• A note from our sponsor - InfluxDB
  www.influxdata.com | 15 May 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 →

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Sponsored

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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