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https://issues.apache.org/jira/browse/HTTPCORE-331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Kalnichevski resolved HTTPCORE-331.
----------------------------------------

       Resolution: Fixed
    Fix Version/s: 4.3-alpha2
                   4.2.4

I think this change alone should have fixed the problem [1]. But fundamentally 
there is no reason why future notifications should be executed within a 
synchronized block (those callbacks can be massively complex and should not 
lock other threads from accessing future's internal state). Fixed by [2].

Could you please re-test your application with the latest 4.2.x snapshot and 
confirm whether or not the problem has been fixed?

Oleg 

[1] http://svn.apache.org/viewvc?rev=1435160&view=rev
[2] http://svn.apache.org/viewvc?rev=1435144&view=rev 
http://svn.apache.org/viewvc?rev=1435147&view=rev
                
> deadlock in AbstractNIOConnPool
> -------------------------------
>
>                 Key: HTTPCORE-331
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-331
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>          Components: HttpCore NIO
>    Affects Versions: 4.2.3
>         Environment: jjdk 1.7.0_u10
>            Reporter: Scott Stanton
>            Priority: Critical
>             Fix For: 4.2.4, 4.3-alpha2
>
>         Attachments: stacks
>
>
> I have run into a deadlock in the AbstractNIOConnPool.  I have attached the 
> deadlock stacks.  I'm not entirely sure what's going on yet, but it appears 
> that nested futures are causing lock ordering problems.

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