Curated List of Notable Java Open‑Source Projects and Resources

1. JavaGuide – https://github.com/Snailclimb/JavaGuide (26396 stars). A comprehensive Java learning guide covering the core knowledge most Java programmers need.

2. DoraemonKit – https://github.com/didi/DoraemonKit (4826 stars). Also known as DoKit, this is a feature‑rich client‑side development assistant for iOS and Android.

3. advanced-java – https://github.com/doocs/advanced-java (10801 stars). An advanced Java knowledge series that helps engineers master topics such as MQ, Elasticsearch, Redis, Dubbo, Hystrix, etc.

4. mall – https://github.com/macrozheng/mall (7184 stars). A complete e‑commerce system built with Spring Boot and MyBatis, featuring both a front‑end storefront and a back‑office management console.

5. Flink – https://github.com/apache/flink (7603 stars). An open‑source, declarative data‑processing engine that combines the efficiency of distributed MapReduce‑style platforms with flexible programming and extensibility.

6. Fescar – https://github.com/alibaba/fescar (5703 stars). Fast & Easy Commit And Rollback, a high‑performance distributed transaction solution for micro‑service architectures.

7. Symphony – https://github.com/b3log/symphony (10988 stars). A modern Java‑based community platform offering forum, Q&A, social networking, and blogging features.

8. Spring Boot – https://github.com/spring-projects/spring-boot (34663 stars). A collection of libraries that simplify the creation of stand‑alone Spring applications, providing embedded Tomcat, auto‑configuration, CLI, and production‑ready features.

9. tutorials – https://github.com/eugenp/tutorials (11957 stars). A series of focused tutorials covering core Java, Jackson, HttpClient, Guava, and especially Spring Framework and Spring Security.

10. h4cker – https://github.com/The-Art-of-Hacking/h4cker (2064 stars). A repository of thousands of security‑related references, including ethical hacking, penetration testing, DFIR, vulnerability research, and reverse engineering.

11. miaosha – https://github.com/qiurunze123/miaosha (5281 stars). A high‑concurrency “flash‑sale” system demonstrating how to handle massive traffic using MQ, Spring Boot, Redis, Dubbo, Zookeeper, Maven, Lua, and other technologies.