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https://issues.apache.org/jira/browse/HTTPCORE-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13671852#comment-13671852
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Oleg Kalnichevski commented on HTTPCORE-164:
--------------------------------------------
Frédéric,
I took a brief look at the stack trace and one thing that strikes as really odd
is that your code attempts to initiate new requests form _inside_
ResponseConsumer#failed event. New connection requests can also fail. As a
result you end up with multiple recursive calls to #lease and
#processPendingRequests method. I suspect this is what may lead to
ConcurrentModificationException as the same collection gets iterated
recursively. I will further investigate the problem but I do think you should
reconsider this approach. In any way this is not the same issue as the one
originally reported. Could you please raise a new JIRA?
Oleg
> DefaultConnectingIOReactor throws ConcurrentModificationException in
> processEvents() method
> -------------------------------------------------------------------------------------------
>
> Key: HTTPCORE-164
> URL: https://issues.apache.org/jira/browse/HTTPCORE-164
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.0-beta2
> Environment: Win XP
> JDK 1.6.0-b105
> httpcore-nio-beta2-20080510.140437-10.jar
> httpcore-beta2-20080510.140437-10.jar
> Reporter: Denis Rogov
> Priority: Critical
>
> Using httpcomponents nio to serve as http client.
> Occasionally getting exception that stops reactor and therefore all engine
> work:
> Exception in thread "IO Reactor Execution Thread"
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at
> org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:93)
> at
> org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:162)
> at
> <...>HttpManagerApacheAsyncEngineImpl$1.run(HttpManagerApacheAsyncEngineImpl.java:294)
> at java.lang.Thread.run(Thread.java:619)
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