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https://issues.apache.org/jira/browse/GEODE-9471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Darrel Schneider resolved GEODE-9471.
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Fix Version/s: 1.15.0
Resolution: Fixed
> gfsh show dead-locks will fail on java 16 and later
> ---------------------------------------------------
>
> Key: GEODE-9471
> URL: https://issues.apache.org/jira/browse/GEODE-9471
> Project: Geode
> Issue Type: Bug
> Components: core
> Reporter: Darrel Schneider
> Priority: Major
> Labels: Java16, Java17
> Fix For: 1.15.0
>
>
> The gfsh show dead-locks command ends up depending on this class:
> org.apache.geode.distributed.internal.deadlock.UnsafeThreadLocal
> Most of the time this UnsafeThreadLocal just behaves like a normal jdk
> ThreadLocal (its super class). But when the gfsh command is executed it
> causes "get" to be called on UnsafeThreadLocal. It uses a bunch of reflection
> to prevent "get" from setting an initial value in the case of a miss. This
> reflection calls setAccessible which will cause get to fail on java 16 and
> later (see:
> [https://softwaregarden.dev/en/posts/new-java/illegal-access-in-java-16]).
> To workaround this failure set the JVM command line option:
> --illegal-access=permit
> The current solution adds get(Thread) to UnsafeThreadLocal which is different
> than ThreadLocal.get(). To fix this we probably need to stop using
> ThreadLocal and instead keep some kind of collection of the threads waiting
> for a resource. It might also be possible to ask the resource what threads
> are waiting for it.
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