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From "Ralf Hauser (JIRA)" <>
Subject [jira] [Commented] (IO-497) DeferredFileOutputStream produces unhandled IOExceptions if the is deleted
Date Mon, 15 Aug 2016 15:52:20 GMT


Ralf Hauser commented on IO-497:

see also IO-512

> DeferredFileOutputStream produces unhandled IOExceptions if the is deleted
> -----------------------------------------------------------------------------------------
>                 Key: IO-497
>                 URL:
>             Project: Commons IO
>          Issue Type: Bug
>          Components: Streams/Writers
>    Affects Versions: 2.4
>         Environment: unix-like operating systems where temporary disk storage is routinely
purged; CentOS specifically
>            Reporter: Nicholas Byrd
>         Attachments: dfos-bug-v2.tar.gz, dfos-bug.tar.gz, example_stack.txt
> In the event that the Java temporary directory is deleted prior to the DeferredFileOutputStream
trying to use it, the stream will throw one of two different IOExceptions (depending on how
the Stream was constructed). 
> This may sound like an unrealistic use-case at first, but it is legitimate as one of
my company's applications encountered it after the underlying operating system (CentOS) automatically
purged the contents of its tmp directory. (The application uses Commons FileUpload, which
invokes DeferredFileOutputStream and does not handle the error itself.) Our current work-around
is to restart the server when this happens, but we feel that the underlying library should
perhaps be intelligent enough to recover from such an error.
> Additionally, it seems an awkward experience that two different errors are produced based
on how the stream was constructed. One approach produces a FileNotFoundException while the
other produces a plain IOException. 
> A small maven project containing a single JUnit test that highlights the error will be
attached (see [dfos-bug.tar.gz|]).

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