[jira] Resolved: (HTTPCLIENT-841) potential memory leak when using ThreadSafeClientConnManager

["Oleg Kalnichevski (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HTTPCLIENT-841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Oleg Kalnichevski resolved HTTPCLIENT-841.
------------------------------------------

    Resolution: Fixed

Patch checked in. Please re-test

Oleg

> 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
>
>         Attachments: HTTPCLIENT-841-depr.patch, HTTPCLIENT-841.patch
>
>
> 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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