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Date: Fri, 31 Aug 2012 07:37:07 +1100 (NCT)
From: "Jonathan Burke (JIRA)" <jira@apache.org>
To: dev@hc.apache.org
Message-ID: <1992043075.18141.1346359027598.JavaMail.jiratomcat@arcas>
In-Reply-To: <2123545851.18139.1346358907841.JavaMail.jiratomcat@arcas>
Subject: [jira] [Updated] (HTTPCLIENT-1229) @ThreadSafe
 BasicClientConnectionManager is not threadsafe with respect to shutdown
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     [ https://issues.apache.org/jira/browse/HTTPCLIENT-1229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Burke updated HTTPCLIENT-1229:
---------------------------------------

    Attachment: stackTrace.txt

A stack trace generated by the attached test.
                
> @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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