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https://issues.apache.org/jira/browse/HTTPASYNC-154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952564#comment-16952564
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Egbert commented on HTTPASYNC-154:
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Thanks, [~olegk] . I checked the versions and there was no explicit dependency
on HttpClient nor HttpCore. I added them with the latest versions as you
mentioned, but the problem persists.
I'll work on collecting the information you requested, it may take a couple of
days before I get around to it.
> Deadlock (?) when using HttpAsyncClient in Java 11
> --------------------------------------------------
>
> Key: HTTPASYNC-154
> URL: https://issues.apache.org/jira/browse/HTTPASYNC-154
> Project: HttpComponents HttpAsyncClient
> Issue Type: Bug
> Affects Versions: 4.1.4
> Environment: Ubuntu 19.04 amd64
> openjdk-8-jdk ~8u222-b10-1ubuntu1~19.04.1
> openjdk-11-jdk ~11.0.4+11-1ubuntu2~19.04
> Reporter: Egbert
> Priority: Minor
>
> I'm working on with a Java Webcrawler based on HttpAsyncClient, and I've
> encountered a situation where a deadlock occurs in Java 11, where it does not
> in Java 8. The software is based on a fork of crawler4j, jcrawler ([
> https://bintray.com/pointpro/jcrawler/JCrawler#files/nl%2Fpointpro%2Fjcrawler%2F2.0.0-snapshot-201910090600|https://bintray.com/pointpro/jcrawler/JCrawler#files/nl%2Fpointpro%2Fjcrawler%2F2.0.0-snapshot-201910090600]
> to be exact)
> The lock occurs in `org.apache.http.nio.pool.AbstractNIOConnPool#lease(T,
> java.lang.Object, long, long, java.util.concurrent.TimeUnit,
> org.apache.http.concurrent.FutureCallback<E>)` on line 278 where the
> `ReentrantLock` `lock` is locked.
> A set of several dozen pages is fetched successfully, but after the 20th
> request, it just hangs there. A created a thread dump that shows the thread
> is waiting to lock, but the thread dump doesn't show any other thread locking
> this lock. It never acquires the lock - it just waits there indefinitely. I
> left it running for an hour or so before killing it. The lock
> AbstractNIOConnPool is waiting for never becomes available but no other
> thread seems to have locked it.
> I'm not sure where to begin gathering more information on this issue. The two
> versions I've tried are:
> openjdk-8-jdk ~8u222-b10-1ubuntu1~19.04.1
> and
> openjdk-11-jdk ~11.0.4+11-1ubuntu2~19.04
> I'm willing to collect additional information but I can see so many
> directions in where I can debug that I don't know where to start.
> I've switched back to Java 8 for now.
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