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Top 23 Java Apache Projects
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Zookeeper is a distributed coordination service used in older versions of Kafka to manage cluster metadata, leader election, and configuration. It ensures consistency and synchronization across Kafka brokers.
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InfluxDB
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seatunnel
SeaTunnel is a next-generation super high-performance, distributed, massive data integration tool.
Project mention: Practical experience in deploying K8s clusters in Apache SeaTunnel separated cluster mode | dev.to | 2025-04-22Official Apache SeaTunnel website: https://seatunnel.apache.org/
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If you follow me on LinkedIn or Medium, you’ve probably noticed I’ve been talking a lot about Apache Iceberg. And as the founder of RisingWave — a stream processing and management system — I get this question a lot:
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Project mention: Hive: An Open-Source Data Warehouse Built on Apache Hadoop | news.ycombinator.com | 2024-08-13
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Dynamic class loading, typically when using either Java Reflection or Groovy Scripting;
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Leetcode
Solutions to LeetCode problems; updated daily. Subscribe to my YouTube channel for more. (by fishercoder1534)
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Apache Log4j 2
Apache Log4j is a versatile, feature-rich, efficient logging API and backend for Java.
Structured logging transforms debugging by providing a detailed, searchable record of an application’s state, including variable values, stack traces, and user actions. According to Gartner, organizations with robust logging systems resolve production issues 40% faster. Doug Crawford, President and Founder of Best Trade Schools, highlights their value: “Implementing a structured logging system… makes isolating the problem straightforward.” Tools like Sentry for real-time error tracking, Log4j for Java applications, or ELK Stack for log aggregation enable developers to pinpoint issues quickly, reducing the need for manual reproduction. For example, Sentry’s breadcrumb feature captures user actions leading to an error, offering a clear debugging trail.
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Language: Java | GitHub: 2.9K+ stars | link
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Iceberg decouples storage from compute. That means your data isn’t trapped inside one proprietary system. Instead, it lives in open file formats (like Apache Parquet) and is managed by an open, vendor-neutral metadata layer (Apache Iceberg).
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Flume
Apache Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log-like data
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Even ASF does not use Maven to build some of its projects anymore: Beam, Groovy, Lucene, Geode, POI, and Solr are not built with Maven. Those are not the most popular ASF projects, I know, but still, it is something.
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bookkeeper
Apache BookKeeper - a scalable, fault tolerant and low latency storage service optimized for append-only workloads
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Project mention: Show HN: Flowcode – Turing-complete visual programming platform | news.ycombinator.com | 2025-04-29
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Project mention: mina-sshd VS sshj - a user suggested alternative | libhunt.com/r/mina-sshd | 2025-03-01
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ranger
Apache Ranger - To enable, monitor and manage comprehensive data security across the Hadoop platform and beyond (by apache)
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Project mention: Show HN: Latudio – a language acquisition app with a listening-oriented approach | news.ycombinator.com | 2024-12-04
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seatunnel-web
SeaTunnel is a distributed, high-performance data integration platform for the synchronization and transformation of massive data (offline & real-time).
[Bug] [Seatunnel-web]No configuration setting found for key 'where_c…ondition' @arshadmohammad
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Ant,
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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 Apache discussion
Java Apache related posts
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Practical experience in deploying K8s clusters in Apache SeaTunnel separated cluster mode
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How to Pitch Your Boss to Adopt Apache Iceberg?
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You’re Invited: Apache SeaTunnel Biweekly Community Meeting on April 8, 2025
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Processing data with “Data Prep Kit” (part 2)
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Max severity RCE flaw discovered in widely used Apache Parquet
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Crawling web sites using “Data Prep Kit”
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🔬Public docker images Trivy scans as duckdb datas on Kaggle
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A note from our sponsor - SaaSHub
www.saashub.com | 13 May 2025
Index
What are some of the best open-source Apache projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Apache ZooKeeper | 12,465 |
| 2 | seatunnel | 8,476 |
| 3 | iceberg | 7,344 |
| 4 | Apache Storm | 6,620 |
| 5 | Apache Hive | 5,700 |
| 6 | groovy | 5,304 |
| 7 | Leetcode | 3,906 |
| 8 | Apache Log4j 2 | 3,475 |
| 9 | Apache Nutch | 3,011 |
| 10 | Apache Parquet | 2,804 |
| 11 | Flume | 2,551 |
| 12 | Apache ActiveMQ | 2,351 |
| 13 | Apache Geode | 2,299 |
| 14 | bookkeeper | 1,930 |
| 15 | Apache OpenNLP | 1,507 |
| 16 | hop | 1,132 |
| 17 | mina-sshd | 969 |
| 18 | Apache ActiveMQ Artemis | 966 |
| 19 | ranger | 950 |
| 20 | Apache Wicket | 759 |
| 21 | Apache Orc | 725 |
| 22 | seatunnel-web | 678 |
| 23 | Apache Ant | 438 |
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