Hutool 3.9 Hot! May 2026

Hutool 3.9: A Comprehensive Java Library for Simplifying Development

No Transitive Chaos: Unlike the newer Hutool 5.x (which added a modular system, but also brought in dependencies like jakarta), Hutool 3.9 has zero external dependencies. Zero. It runs on a raw JDK. For microservices or library authors, this is golden.
Java 8 Mainstay: A vast majority of enterprise systems (banking, logistics, legacy SaaS) are still on Java 8 or 11. Hutool 3.9 was the final polished version before the breaking changes of 5.0.
Spring Boot 2.x Compatibility: Hutool 3.9 works flawlessly with Spring Boot 2.3 through 2.7. No version clashes, no module path issues.

Version 3.9 solidified many of the core modules that developers still rely on today: hutool-core (The Heart) Hutool 3.9

The 3.x branch (including 3.9) laid the groundwork for the modern library's philosophy of being "sweet"—making Java as elegant as a functional language. It primarily improved stability in its JDBC (hutool-db) and Excel (hutool-poi) handling. Hutool 3

Low Learning Curve: The method names are intuitive (e.g., isBlank, isEmpty, unzip). No Transitive Chaos: Unlike the newer Hutool 5

Encapsulation: Wrapping complex native Java APIs into easy-to-use static methods.

public class StringExample public static void main(String[] args) String text = " Hello, World! ";

Maven:

<dependency>
  <groupId>cn.hutool</groupId>
  <artifactId>hutool-all</artifactId>
  <version>3.9.0</version>
</dependency>

Gradle:

implementation 'cn.hutool:hutool-all:3.9.0'