Hello Geotools developers
We've noticed that running geotools on a java version of 22 or higher
causes warning logs to output like:
WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::invokeCleaner has been called by
org.geotools.util.NIOUtilities$CleanupAfterJdk8
(file:/home/glennw/projects/riskscape/riskscape/engine/app/build/install/riskscape/lib/gt-metadata-31.2.jar)
WARNING: Please consider reporting this to the maintainers of class
org.geotools.util.NIOUtilities$CleanupAfterJdk8
WARNING: sun.misc.Unsafe::invokeCleaner will be removed in a future release
I've created a pull request
(https://github.com/geotools/geotools/pull/5695) to add a new memory
cleanup method using the MemorySegment api
(https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/foreign/MemorySegment.html).
The MemorySegment based cleanup will be used if available otherwise it
will fall back to use Unsafe.
I think this is the correct way to do this kind of thing now. But I'm
not entirely sure as I've never had to worry about releasing memory
before the garbage collector gets to it. Can you advise if this is good
or not.
We've also considering if we could no-op the cleanup so our users don't
see this message. Our application is single user so maybe this wouldn't
I thought setting the system property `
geotools.nioutilities.direct=false` would prevent this warning but that
doesn't seem to be the case.
Regards
Glenn
--
*Glenn Walbran*
Software Developer
*Catalyst.Net Ltd - Expert Open Source Solutions
*Catalyst.Net Ltd - a Catalyst IT group company
Mob: +64 21 211 1301 | www.catalyst.net.nz <http://www.catalyst.net.nz>
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