Hutool 3.9 -

There are no breaking changes in the public API between 3.8 and 3.9. You can drop in the new JAR and recompile. The only “gotcha” is that some deprecated methods (mostly from 3.1) were finally removed—check your logs for warnings.

Whether you are processing collections, scraping HTTP endpoints with HttpUtil , generating QR codes (yes, 3.9 supports basic QR via QrCodeUtil ), or just formatting dates – Hutool 3.9 makes Java feel like a modern, high-level language. Hutool 3.9

// Check port availability boolean isOpen = NetUtil.isUsableLocalPort(8080); There are no breaking changes in the public API between 3