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Top Java repositories on GitHub

Enterprise-grade JVM language behind much of the world's backend infrastructure.

Ranked by stars across 26,739 Java repositories on GitHub. Refreshed daily.

  1. 1
    NationalSecurityAgency/ghidra★ 98,184 · ⑂ 11,112

    Ghidra is a software reverse engineering (SRE) framework

    • software-analysis
    • disassembler
    • reverse-engineering
  2. 2
    iluwatar/java-design-patterns★ 94,851 · ⑂ 27,357

    Design patterns implemented in Java

    • java
    • principles
    • design-patterns
    • awesome-list
    • snippets
    • snippets-collection
  3. 3
    macrozheng/mall★ 85,013 · ⑂ 29,831

    mall项目是一套电商系统，包括前台商城系统及后台管理系统，基于Spring Boot+MyBatis实现，采用Docker容器化部署。 前台商城系统包含首页门户、商品推荐、商品搜索、商品展示、购物车、订单流程、会员中心、客户服务、帮助中心等模块。 后台管理系统包含商品管理、订单管理、会员管理、促销管理、运营管理、内容管理、统计报表、财务管理、权限管理、设置等模块。

    • spring-boot
    • spring-security
    • mybatis
    • docker
    • swagger-ui
    • mysql
  4. 4
    spring-projects/spring-boot★ 81,739 · ⑂ 43,443

    Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss.

    • java
    • spring-boot
    • spring
    • framework
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  6. 5
    doocs/advanced-java★ 79,171 · ⑂ 19,108

    😮 Core Interview Questions & Answers For Experienced Java(Backend) Developers | 互联网 Java 工程师进阶知识完全扫盲：涵盖高并发、分布式、高可用、微服务、海量数据处理等领域知识

    • java
    • distributed-systems
    • message-queue
    • redis
    • distributed-search-engine
    • high-availability
  7. 6
    elastic/elasticsearch★ 78,498 · ⑂ 26,200

    Free and Open Source, Distributed, RESTful Search Engine

    • elasticsearch
    • java
    • search-engine
  8. 7
    MisterBooo/LeetCodeAnimation★ 76,715 · ⑂ 13,851

    Demonstrate all the questions on LeetCode in the form of animation.（用动画的形式呈现解LeetCode题目的思路,完整单步/回看/变速/语音讲解在 algomooc.com）

    • leetcode
    • leetcode-solutions
    • leetcode-java
    • animation
    • leetcode-c
  9. 8
    TheAlgorithms/Java★ 66,737 · ⑂ 21,467

    All Algorithms implemented in Java

    • java
    • algorithms
    • algorithms-datastructures
    • algorithm-challenges
    • sorting-algorithms
    • search
  10. 9
    kdn251/interviews★ 65,553 · ⑂ 12,925

    Everything you need to know to get the job.

    • java
    • interview
    • interview-questions
    • interview-practice
    • interview-preparation
    • interview-prep
  11. 10
    termux/termux-app★ 64,198 · ⑂ 8,207

    Termux - a terminal emulator application for Android OS extendible by variety of packages.

    • android
    • terminal
    • termux
    • linux
    • hacktoberfest
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  13. 11
    spring-projects/spring-framework★ 60,310 · ⑂ 38,762

    Spring Framework

    • spring
    • spring-framework
    • spring-mvc
  14. 12
    dbeaver/dbeaver★ 52,320 · ⑂ 4,451

    Free universal database tool and SQL client

    • sql
    • database
    • dbeaver
    • gui
    • mysql
    • postgresql
  15. 13
    google/guava★ 51,923 · ⑂ 11,233

    Google core libraries for Java

    • guava
    • java
  16. 14
    skylot/jadx★ 51,621 · ⑂ 5,905

    Dex to Java decompiler

    • android
    • dex
    • java
    • decompiler
  17. 15
    jeecgboot/JeecgBoot★ 48,389 · ⑂ 16,219

    【AI 时代的业务系统基座】企业级 AI 低代码平台：权限、多租户、工作流、报表、大屏、AI 知识库等通用能力开箱即用，AI 只需生成业务差异部分。AI Skills 一句话生成完整系统——建表、前后端代码、菜单权限、BPM 流程、表单、报表、大屏全自动。内置 AI 应用平台（聊天、知识库、流程编排、MCP），兼容主流大模型。Java + Vue3，支持单体/微服务与信创国产化。

    • antd
    • activiti
    • codegenerator
    • springcloud
    • springboot
    • low-code
  18. 16
    ReactiveX/RxJava★ 48,156 · ⑂ 7,575

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

    • java
    • rxjava
    • flow
    • reactive-streams
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  20. 17
    lysine-dev/retrofit★ 43,937 · ⑂ 7,327

    A type-safe HTTP client for Android and the JVM

    • java
    • android
  21. 18
    ashishps1/awesome-system-design-resources★ 43,098 · ⑂ 8,932

    Learn System Design concepts and prepare for interviews using free resources.

    • awesome
    • backend
    • computer-science
    • distributed-systems
    • high-level-design
    • interview
  22. 19
    apache/dubbo★ 41,572 · ⑂ 26,310

    The java implementation of Apache Dubbo. An RPC and microservice framework.

    • dubbo
    • distributed-systems
    • framework
    • java
    • microservices
    • restful
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Find Java engineers and maintainers

The list above ranks the most-starred public Java repositories, drawn from the public GitHub graph. Across 26,739 Java repositories in the public graph, the maintainers, top contributors, and recurring committers are a powerful signal for where Java expertise lives.

Behind every popular Java project is a small group of people who actually shipped it. They’re the Java engineers, library authors, and infrastructure builders worth knowing - whether you’re hiring, partnering, or doing technical research.

Refolk turns this list into a search. Ask for “Java maintainers hiring”, “contributors to Java repos based in Europe”, or “companies whose engineers ship Java” and Refolk returns a ranked shortlist with the commits, repos, and profiles that earned each person a spot.

How this list is built

Refolk searched GitHub for public repositories whose primary language is Java, ranked them by stargazer count, and kept those with at least 100 stars. The list refreshes once a day.

Last refreshed: Fri, 06 Nov 2026 05:21:52 GMT

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How are these repositories ranked?

By stars, with forks and recent activity as tiebreakers, read from the public GitHub API. The methodology section above has the details.

How fresh is the data?

The ranking re-renders at least daily. Last refreshed: Fri, 06 Nov 2026 05:21:52 GMT.

Can I find the maintainers and contributors behind these repos?

Yes. Stars rank the projects; I can rank the engineers - maintainers, top contributors, and the people they work with. You start with 500 free credits, no card required.

Can I use this list for hiring?

That's the point. I read hiring signals across GitHub, LinkedIn, and the open web, so a repo list turns into a shortlist of engineers worth talking to.

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  1. 01Describe them

    One plain sentence. Role, city, stack, stage, whatever matters to you.

  2. 02I read the web live

    GitHub, public LinkedIn and Crunchbase records, the open web. Not a database that went stale last quarter.

  3. 03You read the shortlist

    Ranked, with the reasoning under every name. Open a profile, ask a follow-up, narrow it down.

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  • Read at search time, so a profile updated yesterday counts today.
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