Top 13 Java Stream Processing Projects

Stream Processing

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1. Hazelcast

   1 7 6,572 9.9 Java

   Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.

   

2. SaaSHub

   www.saashub.com featured

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

   

3. hudi

   2 25 6,175 9.9 Java

   Upserts, Deletes And Incremental Processing on Big Data.

   

   Project mention: Top Open-Source Data Engineering Tools- Unravelling the Best in 2026 | dev.to | 2025-12-10

   Apache Hudi

4. Siddhi

   3 1 1,587 3.1 Java

   Stream Processing and Complex Event Processing Engine

   

5. Smooks

   4 0 416 4.4 Java

   An extensible Java framework for building event-driven applications that break up XML and non-XML data into chunks for data integration

   

6. ksql

   5 4 305 10.0 Java

   The database purpose-built for stream processing applications.

   

7. dagger

   6 1 278 2.7 Java

   Dagger is an easy-to-use, configuration over code, cloud-native framework built on top of Apache Flink for stateful processing of real-time streaming data. (by raystack)

   

8. kafka-streams-in-action

   7 1 269 0.0 Java

   Source code for the Kafka Streams in Action Book

   

9. RemoteCodeCompiler

   8 5 185 8.6 Java

   An online code compiler supporting 11 programming languages (Java, Kotlin, Scala, C, C++, C#, Golang, Python, Ruby, Rust and Haskell) for competitive programming and coding interviews.

   

10. examples

    9 1 90 6.9 Java

    🌟 Examples of use cases that utilize Decodable, as well as demos for related open-source projects such as Apache Flink, Debezium, and Postgres. (by decodableco)

    

11. scotty-window-processor

    10 1 80 4.6 Java

    This repository provides Scotty, a framework for efficient window aggregations for out-of-order Stream Processing.

    

12. kafka-streams-cassandra-state-store

    11 1 25 0.0 Java

    'Drop-in' Kafka Streams State Store implementation that persists data to Apache Cassandra / ScyllaDB

    

13. Event-Meshinery

    12 1 10 6.0 Java

    A new Framework for asynchronous signaling of processes via Kafka/Mysql/anything.

    

14. flink-statefun

    13 1 0 - Java

    Stateful actors on Apache Flink 2.x and Java 21 — durable per-key state, exactly-once messaging, Kafka and Kinesis I/O, Kubernetes-native deployment. Continues the Apache Stateful Functions programming model on the modern Flink line. (by kzmlabs)

    

    Project mention: We forked Apache Stateful Functions for Flink 2.x — here's why | dev.to | 2026-05-03

    We needed it on Flink 2.x. So we maintained the continuation: kzmlabs/flink-statefun.

Java Stream Processing related posts

• Kafka’s creators just replaced it should you burn your cluster or wait it out?

  3 projects | dev.to | 10 Sep 2025

• Apache Pulsar VS quix-streams - a user suggested alternative

  2 projects | 7 Dec 2023

• flink-statefun VS quix-streams - a user suggested alternative

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• beam VS quix-streams - a user suggested alternative

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• debezium VS quix-streams - a user suggested alternative

  2 projects | 7 Dec 2023

• Seeking Feedback on Siddhi

  3 projects | /r/dataengineering | 13 Mar 2023

• Supercharge your Kafka Clusters with Consumer Best Practices

  1 project | /r/programming | 12 Mar 2023
• A note from our sponsor - SaaSHub
  www.saashub.com | 20 Jun 2026

  SaaSHub helps you find the best software and product alternatives Learn more →

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