Darrel Schneider created GEODE-9471:
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Summary: 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
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 iterates all the threads in the jvm checking which are in
the thread local by doing a get. This would cause the thread local to end up
containing all threads. What we could do on these scans (they only happen when
gfsh show dead-locks is executed) is if the get misses for a thread we could
turn around and call ThreadLocal.remove. A bit more expensive than the current
solution but it would be safe and work on java 16.
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