Unsafe.invokeCleaner warning with Java 25

[ebourg]

Unsafe.invokeCleaner usage in CleanerUtil triggers a warning with Java 25:

WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::invokeCleaner has been called by org.apache.poi.poifs.nio.CleanerUtil (file:~/.m2/repository/org/apache/poi/poi/5.5.1/poi-5.5.1.jar)
WARNING: Please consider reporting this to the maintainers of class org.apache.poi.poifs.nio.CleanerUtil
WARNING: sun.misc.Unsafe::invokeCleaner will be removed in a future release

The code in CleanerUtil comes from Hadoop and Lucene. Hadoop still uses the same version but Lucene upgraded it in 2022 (apache/lucene#912, apache/lucene@3b9c728) to use the Foreign Function & Memory API (JEP 454).

Would it be possible to update CleanerUtil to also use the FFM API on Java 22 and later?

[pjfanning]

This is a warning message. It means very little. Java takes years to remove these APIs.
JEP 454 was only finalised in Java 22 and is only in one LTS release, Java 25.