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From "Oleg Kalnichevski (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HTTPCLIENT-1229) @ThreadSafe BasicClientConnectionManager is not threadsafe with respect to shutdown
Date Sun, 09 Sep 2012 10:52:08 GMT

     [ https://issues.apache.org/jira/browse/HTTPCLIENT-1229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Oleg Kalnichevski resolved HTTPCLIENT-1229.
-------------------------------------------

    Resolution: Fixed

This turned out to be more of an internal state management issue than a synchronization bug.
I committed a fix for this defect to SVN trunk and 4.2.x branch.

Oleg
                
> @ThreadSafe BasicClientConnectionManager is not threadsafe with respect to shutdown
> -----------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1229
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1229
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpConn
>    Affects Versions: 4.2.1
>            Reporter: Jonathan Burke
>            Priority: Minor
>         Attachments: BasicClientConnectionManager.java, stackTrace.txt, test.txt
>
>
> Since the assignment to variable shutdown in the shutdown method (line 262) is not part
of the synchronize block and none of the assertNotShutdown method calls are within the synchronized
blocks of their enclosing methods, it is possible to have threads execute the commands of
BasicClientConnectionManager methods in the following sequence.
> Thread 1
> releaseConnection (or some other method that uses assertNotShutdown is called)
>   assertNotShutdown - Passes - Line 183
> Thread 2
> shutdown
>   the shutdown flag becomes true - Line 262
>   shutdown releases this.poolEntry and this.conn in the synchronized(this) block
>   
> Thread 1
>   release connection's synchronized(this) block get's executed 
>   	this.poolEntry is null in the try block causing a null pointer exception - Line 211
>   	this.poolEntry is null in the finally block causing a null pointer exception - Line
224

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