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Starred repositories

153 stars written in Java
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Apache Hadoop

Java 15,529 9,214 Updated Apr 18, 2026

Open source transactional distributed database. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure without compromising performance.

Java 9,703 3,857 Updated Apr 18, 2026

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

Java 8,629 1,825 Updated Apr 16, 2026

A programmer-oriented testing framework for Java — ⚠️ maintenance mode

Java 8,535 3,275 Updated Nov 26, 2025

jOOQ is the best way to write SQL in Java

Java 6,698 1,224 Updated Apr 16, 2026

Distributed Graph Database

Java 5,235 998 Updated Oct 19, 2022

Yahoo! Cloud Serving Benchmark

Java 5,202 2,323 Updated Apr 15, 2026

A scalable, distributed Time Series Database.

Java 5,063 1,239 Updated Dec 12, 2024

Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management

Java 4,437 2,299 Updated Apr 16, 2026

The Apache Tika toolkit detects and extracts metadata and text from over a thousand different file types (such as PPT, XLS, and PDF).

Java 3,703 922 Updated Apr 18, 2026

The official Java SDK for Model Context Protocol servers and clients. Maintained in collaboration with Spring AI

Java 3,365 869 Updated Apr 13, 2026

A process for collecting metrics using JMX MBeans for Prometheus consumption

Java 3,300 1,222 Updated Apr 17, 2026

Apache Nutch is an extensible and scalable web crawler

Java 3,150 1,264 Updated Apr 16, 2026

Plugin Framework for Java (PF4J)

Java 2,693 592 Updated Jan 28, 2026

An open source clone of Amazon's Dynamo.

Java 2,683 582 Updated Jul 24, 2023

The official AWS SDK for Java - Version 2

Java 2,569 996 Updated Apr 18, 2026

Apache Ambari simplifies provisioning, managing, and monitoring of Apache Hadoop clusters.

Java 2,300 1,741 Updated Feb 20, 2026

Apache TinkerPop - a graph computing framework

Java 2,118 848 Updated Apr 17, 2026

Elasticsearch Java Rest Client.

Java 2,105 718 Updated Mar 31, 2023

JLine is a Java library for handling console input.

Java 1,758 243 Updated Apr 17, 2026

EventMesh is a new generation serverless event middleware for building distributed event-driven applications.

Java 1,725 649 Updated Apr 2, 2026

The open source BIMserver platform

Java 1,702 642 Updated Mar 13, 2026

OpenTracing API for Java. 🛑 This library is DEPRECATED! https://github.com/opentracing/specification/issues/163

Java 1,684 339 Updated Oct 11, 2021

XChart is a light-weight Java library for plotting data.

Java 1,581 399 Updated Oct 27, 2025

This is mavenised Luke: Lucene Toolbox Project

Java 1,546 352 Updated Feb 28, 2020

Apache Jena, A free and open source Java framework for building Semantic Web and Linked Data applications.

Java 1,321 684 Updated Apr 18, 2026

Twitter's collection of LZO and Protocol Buffer-related Hadoop, Pig, Hive, and HBase code.

Java 1,134 384 Updated Apr 10, 2023

A high performance thread-safe map that expires entries

Java 1,035 148 Updated Jan 25, 2025

Mirror of Apache Usergrid

Java 990 414 Updated Jun 27, 2025

A scalable, mature and versatile web crawler based on Apache Storm

Java 974 273 Updated Apr 14, 2026
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