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https://issues.apache.org/jira/browse/LUCENE-6518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14571646#comment-14571646
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Dawid Weiss commented on LUCENE-6518:
-------------------------------------
This class's source is even provided in IBM's jdk. Interesting. The
{{QuickPatchThreadsFilter}} has a list of ignored threads. This is by large
hard to predict, so I'd just include it there.
> "classcache reaper" needs exemption from thread leaks
> -----------------------------------------------------
>
> Key: LUCENE-6518
> URL: https://issues.apache.org/jira/browse/LUCENE-6518
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-6518.patch
>
>
> This happens on IBM JDK (some system thread or what have you).
> its 100% reproducible if you just cd lucene/analysis/smartcn and run 'ant
> test': we time out waiting for the thread to die and fail like this:
> {noformat}
> [junit4] Suite:
> org.apache.lucene.analysis.cn.smart.TestHMMChineseTokenizerFactory
> [junit4] 2> Jun 03, 2015 12:30:39 PM
> com.carrotsearch.randomizedtesting.ThreadLeakControl checkThreadLeaks
> [junit4] 2> WARNING: Will linger awaiting termination of 1 leaked
> thread(s).
> [junit4] 2> Jun 03, 2015 12:30:59 PM
> com.carrotsearch.randomizedtesting.ThreadLeakControl checkThreadLeaks
> [junit4] 2> SEVERE: 1 thread leaked from SUITE scope at
> org.apache.lucene.analysis.cn.smart.TestHMMChineseTokenizerFactory:
> [junit4] 2> 1) Thread[id=27, name=ClassCache Reaper, state=WAITING,
> group=TGRP-TestHMMChineseTokenizerFactory]
> [junit4] 2> at java.lang.Object.wait(Native Method)
> [junit4] 2> at java.lang.Object.wait(Object.java:201)
> [junit4] 2> at
> java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:119)
> [junit4] 2> at
> java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:91)
> [junit4] 2> at java.io.ClassCache$Reaper.run(ClassCache.java:222)
> [junit4] 2> Jun 03, 2015 12:30:59 PM
> com.carrotsearch.randomizedtesting.ThreadLeakControl tryToInterruptAll
> [junit4] 2> INFO: Starting to interrupt leaked threads:
> [junit4] 2> 1) Thread[id=27, name=ClassCache Reaper, state=WAITING,
> group=TGRP-TestHMMChineseTokenizerFactory]
> [junit4] 2> Jun 03, 2015 12:31:02 PM
> com.carrotsearch.randomizedtesting.ThreadLeakControl tryToInterruptAll
> [junit4] 2> SEVERE: There are still zombie threads that couldn't be
> terminated:
> [junit4] 2> 1) Thread[id=27, name=ClassCache Reaper, state=WAITING,
> group=TGRP-TestHMMChineseTokenizerFactory]
> [junit4] 2> at java.lang.Object.wait(Native Method)
> [junit4] 2> at java.lang.Object.wait(Object.java:201)
> [junit4] 2> at
> java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:119)
> [junit4] 2> at
> java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:91)
> [junit4] 2> at java.io.ClassCache$Reaper.run(ClassCache.java:222)
> [junit4] 2> NOTE: test params are: codec=Asserting(Lucene50): {},
> docValues:{}, sim=RandomSimilarityProvider(queryNorm=true,coord=no): {},
> locale=ar_JO, timezone=Europe/Andorra
> [junit4] 2> NOTE: Linux 3.13.0-49-generic amd64/IBM Corporation 1.8.0
> (64-bit)/cpus=8,threads=2,free=1204464,total=20643840
> [junit4] 2> NOTE: All tests run in this JVM:
> [TestHMMChineseTokenizerFactory]
> [junit4] 2> NOTE: reproduce with: ant test
> -Dtestcase=TestHMMChineseTokenizerFactory -Dtests.seed=4546D15E2A47A285
> -Dtests.locale=ar_JO -Dtests.timezone=Europe/Andorra -Dtests.asserts=true
> -Dtests.file.encoding=UTF-8
> {noformat}
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