Analysis of the Top 100 Most Popular Java Libraries on GitHub

We examined 47,251 import statements from 3,862 popular Java projects on GitHub, extracting 12,059 distinct Java libraries. From this data set we selected the 100 most frequently referenced libraries and present the results.

Top 20 Java Libraries

JUnit ranks first for the second consecutive year, followed by SLF4J in second place and Log4j in fourth. Google’s Guava library claims the third spot, offering a comprehensive set of core utilities.

The Rise of Spring Libraries

Spring continues to dominate the Java EE landscape, with 44 of the top 100 libraries related to Spring. Notably, Spring Boot shows rapid growth, enabling developers to create production‑ready applications with minimal configuration. The most popular Spring libraries include spring‑context, spring‑test, spring‑webmvc, spring‑core, spring‑web, spring‑jdbc, spring‑orm, spring‑tx, spring‑aop, spring‑context‑support, spring‑boot‑starter‑web, spring‑security‑web, spring‑security‑config, spring‑boot‑starter‑test, and spring‑security‑core.

Most Popular JSON Libraries

Because Java lacks native JSON support, developers rely on external libraries. The leading JSON libraries are Jackson‑databind (rank 14), Gson (rank 19), json (rank 43), json‑simple (rank 80), and XStream (rank 89).

Four Standout Libraries

Among many interesting projects, four libraries received special attention: Lombok (rank 68) simplifies Java code with annotations; Jsoup (rank 90) provides a jQuery‑like API for HTML parsing; Netty (rank 92) offers a high‑performance network framework; and dom4j (rank 98) is an open‑source XML processing library.

Ranking Methodology

We first identified top‑ranked Java projects on GitHub, then extracted Maven or Ivy dependency files (pom.xml / ivy.xml) to collect import statements, resulting in 47,251 data points. After aggregation and analysis, we derived the frequency of each library’s appearance, which formed the basis of the top‑100 list.

Reflection

Comparing this year’s data with the previous year shows a modest shift: Spring‑related libraries have generally risen in rank, while interest in MongoDB‑related libraries has declined. Most Java developers remain loyal to their chosen libraries, suggesting that the top libraries will stay popular for years to come.

For readers seeking further guidance, we recommend the article “15 Tools Java Developers Love After Version Upgrades.”

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