[ http://issues.apache.org/jira/browse/IO-99?page=comments#action_12450687 
] 
            
Vera Mickaël commented on IO-99:
--------------------------------

I don't know if a daemon thread prevents a classloader from being garbaged ?

I worked for several days on classloader leaks, classloaders that are never 
garbaged because a system class or a container class keeps a reference on the 
webapp classloader. In memory dumps I can see that FileCleaner thread keeps 
references on my webapp classloader, this thread is referenced by the JBoss 
thread pool wich is a container class.

I can't say if this thread is responsible for my classloader leak, my opinion 
is that it does (look links provided, the fist one)

But this thread adds many references to a dump that is already difficult read 
(I use a modified version of jhat). A service in the API stopping the thread 
would really simplify the task of developpers like me working on classlodaer 
leaks.

I will open an issue in commons.fileupload referencing this one, maybe this 
package have more concerns about webapp environments.

http://opensource.atlassian.com/confluence/spring/pages/viewpage.action?pageId=2669
http://blogs.sun.com/fkieviet/entry/how_to_fix_the_dreaded

Thanks to whole developpers team for their work

> FileCleaner thread never ends and cause memory leak in AS
> ---------------------------------------------------------
>
>                 Key: IO-99
>                 URL: http://issues.apache.org/jira/browse/IO-99
>             Project: Commons IO
>          Issue Type: Bug
>    Affects Versions: 1.2
>         Environment: JBOssPortal with commons.fileupload
>            Reporter: Vera Mickaël
>            Priority: Critical
>
> FileCleaner opens a thread and no solution is given to the user to end it. So 
> when an application is undeployed
> in an Application Server, a thread is still alive. The WebApp can't be 
> undeployed and this results in a classloader
> leak that will cause an OutOfMemoryError.
> I think the API should be extended so that a user can end the thread. A 
> better way would be to provide a class that
> cleans everything for commons IO.

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