Top 12 Popular Java Open-Source Projects on GitHub in June

1. Halo – https://github.com/halo-dev/halo – 6,139 stars – A lightweight, simple yet powerful blog system built with Java.

2. jeecg-boot – https://github.com/zhangdaiscott/jeecg-boot – 2,873 stars – A rapid Java development platform based on a code generator, offering online configuration, form/report design, and a no‑code development mode.

3. CS-Notes – https://github.com/CyC2018/CS-Notes – 68,580 stars – An interview‑preparation repository covering nine major modules: algorithms, operating systems, networking, OOP, databases, Java, distributed systems, tools, and coding practice.

4. FEBS-Shiro – https://github.com/wuyouzhuguli/FEBS-Shiro – 2,477 stars – A simple and efficient backend permission‑management system built with Spring Boot, Shiro, and Layui.

5. JavaGuide – https://github.com/Snailclimb/JavaGuide – 46,223 stars – A comprehensive Java learning guide covering most core knowledge required by Java developers.

6. advanced-java – https://github.com/doocs/advanced-java – 23,576 stars – Advanced Java topics; readers are advised to first familiarize themselves with MQ, Elasticsearch, Redis, Dubbo, Hystrix, etc., via quick‑start demos.

7. mall-learning – https://github.com/macrozheng/mall-learning – 335 stars – A tutorial that thoroughly analyzes architecture, business, and technical highlights of a demo e‑commerce project, using SpringBoot 2.1.3, MyBatis 3.4.6, Elasticsearch 6.2.2, RabbitMQ 3.7.15, Redis 3.2, MongoDB 3.2, MySQL 5.7, and Docker.

8. tutorials – https://github.com/eugenp/tutorials – 15,193 stars – A collection of small, focused tutorials, most of which concentrate on the Spring Framework (and Spring Security) and cover core Java, Jackson, HttpClient, Guava, etc.

9. vhr – https://github.com/lenve/vh – 4,651 stars – A front‑back separated human‑resource management system built with SpringBoot and Vue.

10. mall – https://github.com/macrozheng/mall – 16,668 stars – An e‑commerce system implemented with mainstream technologies: SpringBoot 2.1.3, MyBatis 3.4.6, Elasticsearch 6.2.2, RabbitMQ 3.7.15, Redis 3.2, MongoDB 3.2, MySQL 5.7, and Docker deployment.

11. p3c – https://github.com/alibaba/p3c – 16,435 stars – Alibaba’s Java code‑style checking plugin, launched at the 2017 Hangzhou Cloud Conference.

12. dubbo – https://github.com/apache/dubbo – 27,468 stars – A high‑performance RPC framework from Alibaba that integrates seamlessly with Spring, providing networking, load‑balancing, fault‑tolerance, and service registry capabilities.