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From "Sam Berlin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HTTPCLIENT-841) potential memory leak when using ThreadSafeClientConnManager
Date Thu, 16 Apr 2009 12:57:14 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699686#action_12699686
] 

Sam Berlin commented on HTTPCLIENT-841:
---------------------------------------

I have a little familiarity with it. I'll take a look -- I think the garbage collection closing
is a useful thing to keep, if possible.  

> potential memory leak when using ThreadSafeClientConnManager
> ------------------------------------------------------------
>
>                 Key: HTTPCLIENT-841
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-841
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient
>    Affects Versions: 4.0 Beta 2
>         Environment: Leopard 10.5.6, Java 1.5.0_16, Jetty 6.1.7
>            Reporter: Ted Slusser
>             Fix For: 4.0 Beta 3
>
>
> When using ThreadSafeClientConnManager and developing with Jetty using auto-redeploy
feature eventually I run into a PermGen out of memory exception.  I investigated with YourKit
8.0.6 and found a class loader circular reference in RefQueueWorker.  Not really sure what
I was doing I made the refQueueHandler non-final and nulled it in the shutdown method of RedQueueWorker.
 I don't seem to have the problem any longer with circular class loader references.
> Here is a diff from 4.0-beta2
> --- httpclient/src/main/java/org/apache/http/impl/conn/tsccm/RefQueueWorker.jav(revision
763223)
> +++ httpclient/src/main/java/org/apache/http/impl/conn/tsccm/RefQueueWorker.jav(working
copy)
> @@ -50,7 +50,7 @@
>      protected final ReferenceQueue<?> refQueue;
>  
>      /** The handler for the references found. */
> -    protected final RefQueueHandler refHandler;
> +    protected RefQueueHandler refHandler;
>  
>  
>      /**
> @@ -112,6 +112,8 @@
>              this.workerThread = null; // indicate shutdown
>              wt.interrupt();
>          }
> +
> +        refHandler = null;
>      }
>  
>  

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