Best open source Java repositories on GitHub

iluwatar/java-design-patterns

Java

Design patterns implemented in Java

elastic/elasticsearch

Java

Free and Open Source, Distributed, RESTful Search Engine

TheAlgorithms/Java

Java

All Algorithms implemented in Java

Stirling-Tools/Stirling-PDF

Java

#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere

dbeaver/dbeaver

Java

Free universal database tool and SQL client

YunaiV/ruoyi-vue-pro

Java

🔥 官方推荐 🔥 RuoYi-Vue 全新 Pro 版本，优化重构所有功能。基于 Spring Boot + MyBatis Plus + Vue & Element 实现的后台管理系统 + 微信小程序，支持 RBAC 动态权限、数据权限、SaaS 多租户、Flowable 工作流、三方登录、支付、短信、商城、CRM、ERP、MES、IM、AI 大模型、IoT 物联网等功能。你的 ⭐️ Star ⭐️，是作者生发的动力！

xuxueli/xxl-job

Java

A distributed task scheduling framework.（分布式任务调度平台XXL-JOB）

openjdk/jdk

Java

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

Anuken/Mindustry

Java

The automation tower defense RTS

apache/shardingsphere

Java

Empowering Data Intelligence with Distributed SQL for Sharding, Scalability, and Security Across All Databases.

JetBrains/intellij-community

Java

IntelliJ IDEA & IntelliJ Platform

YunaiV/yudao-cloud

Java

ruoyi-vue-pro 全新 Cloud 版本，优化重构所有功能。基于 Spring Cloud Alibaba + MyBatis Plus + Vue & Element 实现的后台管理系统 + 用户小程序，支持 RBAC 动态权限、多租户、数据权限、工作流、三方登录、支付、短信、商城、CRM、ERP、MES、IM、AI 大模型、IoT 物联网等功能。你的 ⭐️ Star ⭐️，是作者生发的动力！

baomidou/mybatis-plus

Java

An powerful enhanced toolkit of MyBatis for simplify development

apache/doris

Java

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

itwanger/toBeBetterJavaer

Java

一份通俗易懂、风趣幽默的Java学习指南，内容涵盖Java基础、Java并发编程、Java虚拟机、Java企业级开发、Java面试等核心知识点。学Java，就认准二哥的Java进阶之路😄

ben-manes/caffeine

Java

A high performance caching library for Java

PaperMC/Paper

Java

The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies

codecentric/spring-boot-admin

Java

Admin UI for administration of spring boot applications

opensearch-project/OpenSearch

Java

🔎 Open source distributed and RESTful search engine.

StarRocks/starrocks

Java

The world's fastest open query engine for sub-second analytics both on and off the data lakehouse. With the flexibility to support nearly any scenario, StarRocks provides best-in-class performance for multi-dimensional analytics, real-time analytics, and ad-hoc queries. A Linux Foundation project.