Top Java Open‑Source Projects on GitHub (May)

1. LeetCodeAnimation – https://github.com/MisterBooo/LeetCodeAnimation – ★ 28,897 – The project animates every LeetCode problem, providing visual explanations of algorithmic solutions.

2. CS-Notes – https://github.com/CyC2018/CS-Notes – ★ 64,336 – A comprehensive interview‑preparation repository covering nine modules: algorithms, operating systems, networking, object‑oriented concepts, databases, Java, distributed systems, tools, and coding practices.

3. JavaGuide – https://github.com/Snailclimb/JavaGuide – ★ 42,012 – A Java learning guide that consolidates core knowledge required by most Java developers.

4. mall – https://github.com/macrozheng/mall – ★ 14,608 – An e‑commerce system built with SpringBoot + MyBatis, featuring a front‑end shop and a back‑end admin panel with modules such as product management, order processing, member services, promotions, operations, content, reporting, finance, and permissions.

5. advanced-java – https://github.com/doocs/advanced-java – ★ 20,790 – Advanced Java topics covering MQ, Elasticsearch, Redis, Dubbo, Hystrix, etc.; readers are advised to first familiarize themselves with each technology via quick‑start demos.

6. spring-boot – https://github.com/spring-projects/spring-boot – ★ 38,523 – Spring Boot is a collection of libraries that simplifies building standalone Spring applications, offering an embedded Tomcat, streamlined Maven configuration, auto‑configuration, production‑ready features (metrics, health checks, external config), and requires no XML or code generation.

7. Java (TheAlgorithms/Java) – https://github.com/TheAlgorithms/Java – ★ 14,277 – A repository containing Java implementations of a wide range of algorithms.

8. tutorials – https://github.com/eugenp/tutorials – ★ 14,484 – A series of focused tutorials, primarily on the Spring Framework and Spring Security, covering core Java, Jackson, HttpClient, Guava, and other related technologies.

9. server – https://github.com/wildfirechat/server – ★ 2,239 – Wildfire IM is a cross‑platform, fully open‑source instant‑messaging solution.

10. litemall – https://github.com/linlinjava/lit – ★ 7,106 – A small e‑commerce demo consisting of a Spring Boot backend, a Vue admin front‑end, and a WeChat mini‑program front‑end, intended for local testing.

11. spring-framework – https://github.com/spring-projects/spring-framework – ★ 29,551 – The official GitHub home for the Spring Framework, encompassing all core Spring projects and libraries.