Hutool 3.9 Upd =link= -

His solution was elegant: a new thread-local Pattern cache. But as he fixed it, he noticed a secondary issue in FileUtil.tail —it leaked file handles on Linux systems when interrupted. Then a third issue: SecureUtil.sha256() collided with the new FIPS-compliant providers in Java 17.

I believe you're asking about and what were the good/notable features in that update. Hutool 3.9 UPD

If you are maintaining a legacy system:

: Enhanced support for copying properties between beans, including better handling of different data types and improved performance for large-scale data mapping. Cryptographic Improvements His solution was elegant: a new thread-local Pattern cache

"What do we do?" Lina whispered. "Downgrade?" Hutool 3.9 UPD

Use DateUtil.beginOfDay(date, TimeZone.getTimeZone("GMT+8")) .

Hutool 3.9.x was a significant release series (around late 2020–early 2021). Here are the that stood out in Hutool 3.9: