Top 10 Must-Explore Java Open‑Source Projects for 2020

2019 December GitHub's most popular Java open‑source projects ranking is released. Below are the top 10 projects with links, star counts and brief descriptions.

1. Alink

URL: https://github.com/alibaba/Alink

Stars: 1695

Alink is Alibaba's machine‑learning platform built on Flink, offering a rich algorithm component library and a one‑click framework for data processing, feature engineering, model training and prediction. It is widely used in Alibaba's search, recommendation and advertising services.

2. halo

URL: https://github.com/halo-dev/halo

Stars: 11617

Halo is a modern, lightweight, clean and powerful blog system developed in Java.

3. Spring‑boot‑demo

URL: https://github.com/xkcoding/spring-boot-demo

Stars: 8866

Spring Boot Demo is a project for deep learning and practicing Spring Boot, containing 63 integrated demos (52 completed) covering Actuator, Admin, Logback, AOP logging, unified exception handling, template engines (Freemarker, Thymeleaf, Beetl, Enjoy), JdbcTemplate, JPA and more.

4. BigData‑Notes

URL: https://github.com/heibaiying/BigData-Notes

Stars: 4341

BigData‑Notes is an introductory tutorial covering core concepts and basics of common big‑data technologies such as Hadoop, Spark, Storm, HBase, Hive, ZooKeeper and Kafka.

5. vhr

URL: https://github.com/lenve/vhr

Stars: 12987

VHR is a front‑back separated human‑resource management system built with SpringBoot and Vue.

6. flink‑learning

URL: https://github.com/zhisheng17/flink-learning

Stars: 4280

This project includes Flink basics, concepts, principles, practical cases, performance tuning, source code analysis, and covers Flink Connector, Metrics, Library, DataStream API, Table API & SQL, plus large‑scale application examples.

7. LeetCodeAnimation

URL: https://github.com/MisterBooo/LeetCodeAnimation

Stars: 47297

LeetCodeAnimation visualizes all LeetCode problems with animations; the creator aims to complete the animation set over 3‑4 years.

8. jeecg‑boot

URL: https://github.com/zhangdaiscott/jeecg-boot

Stars: 9044

Jeecg‑boot is a rapid Java development platform based on a code generator, using a front‑back separated architecture (SpringBoot 2.x, Ant Design & Vue, Mybatis‑plus, Shiro, JWT). It can generate full‑stack code with a single click, reducing 70% of repetitive work.

9. advanced‑java

URL: https://github.com/doocs/advanced-java

Stars: 36863

Advanced‑Java provides comprehensive knowledge for Java engineers, covering MQ, ES, Redis, Dubbo, Hystrix and more, serving as a complete reference for intermediate‑level Java topics.

10. mall

URL: https://github.com/macrozheng/mall

Stars: 27700

Mall is an e‑commerce system with front‑end storefront and back‑end management, built with SpringBoot and MyBatis. It includes modules such as product catalog, search, shopping cart, order processing, member center, and extensive admin features like product, order, promotion, content, reporting, finance and permission management.