Hutool 3.9 Upd May 2026

If you are maintaining a legacy system:

Maven Coordinates (Current Standard):

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.8.26</version> <!-- Or latest 6.x -->
</dependency>

Fix: Use DateUtil.beginOfDay(date, TimeZone.getTimeZone("GMT+8")). Hutool 3.9 UPD

Cause: Using raw types.
Solution: Always parameterize: Convert.convert(List.class, myObject) → Convert.convert(new TypeReference<List<String>>(){}, myObject).

They called the maintainer of Hutool—a reclusive, brilliant engineer known only as "Looly" in the commit history. Looly listened, then responded with a single line: If you are maintaining a legacy system:

"3.9.1 incoming. 30 minutes."

But 30 minutes was too long. Every second, the Order Processing Tower was logging thousands of exceptions. The logs were filling disks. The monitoring alarms were screaming red. Fix: Use DateUtil

So Old Kai did something dangerous. He wrote a runtime patch—a Java agent that intercepted calls to blankToDefault and rewrote the bytecode on the fly, restoring the old null-check logic.

"It's ugly," he said, "but it buys us time."

Lina deployed the agent. The errors stopped. Silence returned to the tower.