Hutool 39 New High Quality -

Hutool 6.x New Features Guide (What’s New After 5.x)

1. Overview

Hutool 6.x is a major upgrade from 5.x, with JDK 17+ baseline, improved performance, and new modules.
If you are still on JDK 8, stick with Hutool 5.8.x LTS.

hutool-crypto: Encapsulates common encryption algorithms like MD5, SHA, AES, and RSA into easy-to-use static methods. 🛠️ Standout Features in the 3.9 Era hutool 39 new

Preparing our codebase for the eventual migration to Hutool 6.0/7.0. Update your to the latest version at Maven Central Hutool 6

3.2 crypto Module Overhaul

• Modern AEAD support (AES/GCM, ChaCha20).
• SymmetricCrypto now auto-chooses mode/padding.
• Asymmetric encryption with SM2 (Chinese national standard) improved.

Feature Activation: Enabling hidden features like Apple CarPlay, Android Auto, or custom navigation maps. Modern AEAD support (AES/GCM, ChaCha20)

A. Improved Convert Engine

The universal conversion class (String to Date, Number to Boolean) was refactored in 3.9 to cache conversion logic. If you convert a String "123" to Integer twice, the second conversion bypasses the parsing algorithm and uses a cached result. In high-throughput log processing, this reduced GC pressure by roughly 15%.

💡 Why Update?

While "minor" versions often seem skippable, Hutool 5.8.39 contains patches for specific edge cases that could cause runtime exceptions in production environments. If your application relies on Reflection or File I/O, this update is highly recommended to prevent hard-to-trace bugs.