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From "Oleg Kalnichevski (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCORE-164) DefaultConnectingIOReactor throws ConcurrentModificationException in processEvents() method
Date Fri, 31 May 2013 22:14:20 GMT

    [ https://issues.apache.org/jira/browse/HTTPCORE-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13671852#comment-13671852

Oleg Kalnichevski commented on HTTPCORE-164:

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?

> DefaultConnectingIOReactor throws ConcurrentModificationException in processEvents()
> -------------------------------------------------------------------------------------------
>                 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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