KlassTrainingData in AOT cache without holder

[María Arias de Reyna Dominguez]

Hi!

This also happens to MethodTrainingData objects so I guess this is either
me understanding wrong what "excluded" means or a bug on the way the
cleanup of excluded elements from AOT Cache work.

Cheers!
María. <ariasdereyna at redhat.com>


On Wed, Oct 8, 2025 at 1:00 PM María Arias de Reyna Dominguez <
mariasde at redhat.com> wrote:

> Hi!
>
> I'm working on adding the class name to the KlassTrainingData line in the
> AOT map file: https://bugs.openjdk.org/browse/JDK-8369418
>
> I found that some of the KlassTrainingData have no InstanceKlass
> associated to it ( _holder is a null pointer). If I follow the logs, it is
> because that KlassTrainingData was excluded from the AOT:
>
> https://github.com/openjdk/jdk/blob/master/src/hotspot/share/oops/trainingData.cpp#L550-L561
>
> $ cat aot.log* | grep "Cleanup KTD" | head
> [debug][aot,training             ] Cleanup KTD
> org.infinispan.commons.logging.log4j.XmlConfiguration
> [debug][aot,training             ] Cleanup KTD
> org.infinispan.manager.DefaultCacheManager
> [debug][aot,training             ] Cleanup KTD
> org.infinispan.distribution.DistributionInfo
> [debug][aot,training             ] Cleanup KTD
> org.apache.logging.log4j.core.config.Node
> [debug][aot,training             ] Cleanup KTD
> org.infinispan.factories.impl.BasicComponentRegistry
> [debug][aot,training             ] Cleanup KTD
> org.apache.logging.log4j.util.Lazy
> [debug][aot,training             ] Cleanup KTD
> org.infinispan.factories.AnyScopeComponentFactory
> [debug][aot,training             ] Cleanup KTD
> org.infinispan.rest.framework.impl.PathItem
> [debug][aot,training             ] Cleanup KTD
> io.micrometer.core.instrument.ImmutableTag
> [debug][aot,training             ] Cleanup KTD
> org.infinispan.commons.util.ArrayMap$KeySet
>
> But the KlassTrainingData with the null pointer is there, on the AOT Cache
> (or at least on the AOT Map File logger).
>
> Am I missing something here? If it is excluded, why is it on the cache?
>
> If not, how do we relate this training data to anything useful?
>
> Cheers!
> María Arias de Reyna Domínguez
> Senior Software Engineer
> She / Her / Hers
>
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