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461 stars written in Java
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Design patterns implemented in Java

Java 93,692 27,384 Updated Jan 17, 2026

Free and Open Source, Distributed, RESTful Search Engine

Java 76,021 25,797 Updated Feb 6, 2026

Google core libraries for Java

Java 51,459 11,141 Updated Feb 5, 2026

Free universal database tool and SQL client

Java 48,574 4,028 Updated Feb 6, 2026

RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

Java 48,522 7,605 Updated Feb 6, 2026

Dex to Java decompiler

Java 47,207 5,422 Updated Feb 4, 2026

Getting Started with Spring Boot 3:

Java 37,339 53,866 Updated Feb 6, 2026

A libre lightweight streaming front-end for Android.

Java 37,032 3,442 Updated Feb 6, 2026

An image loading and caching library for Android focused on smooth scrolling

Java 35,018 6,180 Updated Jan 29, 2026

Open Source Identity and Access Management For Modern Applications and Services

Java 32,686 8,035 Updated Feb 6, 2026

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Java 26,317 2,480 Updated Feb 6, 2026

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Java 25,758 7,377 Updated Feb 6, 2026

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex di…

Java 24,469 4,714 Updated Dec 17, 2025

JDK main-line development https://openjdk.org/projects/jdk

Java 22,466 6,251 Updated Feb 6, 2026

光 HikariCP・A solid, high-performance, JDBC connection pool at last.

Java 20,990 3,009 Updated Nov 4, 2025

Modular and customizable Material Design UI components for Android

Java 17,146 3,214 Updated Feb 3, 2026

Apache Doris is an easy-to-use, high performance and unified analytics database.

Java 14,992 3,704 Updated Feb 6, 2026

Very spicy additions to the Java programming language.

Java 13,380 2,468 Updated Feb 6, 2026

greenDAO is a light & fast ORM solution for Android that maps objects to SQLite databases.

Java 12,625 2,881 Updated Apr 30, 2024

Fast Android Development. Easy maintainance.

Java 11,022 2,328 Updated May 31, 2022

Java JWT: JSON Web Token for Java and Android

Java 11,011 1,383 Updated Oct 17, 2025

A Java API for generating .java source files.

Java 10,868 1,390 Updated Oct 10, 2024

LangChain4j is an open-source Java library that simplifies the integration of LLMs into Java applications through a unified API, providing access to popular LLMs and vector databases. It makes impl…

Java 10,658 1,950 Updated Feb 6, 2026

A collection of source code generators for Java.

Java 10,549 1,213 Updated Feb 3, 2026

Resilience4j is a fault tolerance library designed for Java8 and functional programming

Java 10,540 1,445 Updated Feb 6, 2026

A simple expressive web framework for java. Spark has a kotlin DSL https://github.com/perwendel/spark-kotlin

Java 9,667 1,571 Updated Oct 8, 2023

A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users.

Java 9,067 2,807 Updated Feb 4, 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 8,574 1,795 Updated Feb 3, 2026

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

Java 8,537 3,283 Updated Nov 26, 2025

Code for Quartz Scheduler

Java 6,683 1,991 Updated Jan 30, 2026
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