KlassTrainingData in AOT cache without holder

[María Arias de Reyna Dominguez]

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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