Choose 3.9 if you need a stable, enclosed library for a legacy JDK 7/8 monolith that will never be upgraded. Choose 5.x if you want HTTP client upgrades or the latest BeanUtil features.
Hutool encapsulates this complexity. In the 3.9 version, the HTTP client was robust enough for most non-critical internal API calls: Hutool 3.9
This API design reduces a 20-line native Java implementation into a single line. Choose 3
// Create a file (supports creating parent directories automatically) FileUtil.touch("/data/test.txt"); Hutool 3.9
In the lifecycle of any open-source software, certain versions mark a turning point. represents a mature phase of the library's 3.x branch. During this era, Hutool transitioned from being a niche utility to a robust framework widely adopted in production environments across Asia.