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From "F. Andy Seidl (JIRA)" <>
Subject [jira] Commented: (FILEUPLOAD-149) Intermittent file corruption on upload
Date Mon, 14 Apr 2008 20:05:04 GMT


F. Andy Seidl commented on FILEUPLOAD-149:

Hi Jochen (and others): 

I recently re-tried FileUpload on the affected Linux servers after upgrading to the latest
release version of commons-io, but the issues remain.  I realize that Jochen does not believe
these results, but I remain stumped as to why the same code runs on most of my servers but
corrupts files on others.  It must be some type of environmental issue, but like what? This
is particularly nasty for me to debug (lacking any guidance or hypotheses) because I *only*
see failures on a small number of production machines.  I have not been able to reproduce
these failures on a development system.  As such, it is a very slow debugging cycle to deploy
debugging code and do bug hunting on a production server.

*Any* suggestions as to what might create the type of corruptions I am seeing (and I really
am seeing them) would be greatly appreciated.

Thank you,
  -- fas

> Intermittent file corruption on upload
> --------------------------------------
>                 Key: FILEUPLOAD-149
>                 URL:
>             Project: Commons FileUpload
>          Issue Type: Bug
>    Affects Versions: 1.2
>         Environment: Linux (CentOS) server; all client platforms and browsers
>            Reporter: F. Andy Seidl
>            Priority: Critical
> I have been struggling for several weeks trying to track down the root cause
> of a sporadic file corruption problem using File Upload.  I'm really stumped
> at this point and welcome any suggestions as to avenues of debugging
> pursuit.
> Here's overview of the problem:
> I have eight Linux (CentOS) servers all running the same web application--a
> set of Java servlets using Resin as a servlet runner under Apache.  All
> servers were configured using the same script that installs jars,
> config files, etc.
> On three of the servers, File Upload works reliably.  On five of the
> servers, File Upload usually (but not always) leaves me with a corrupted file.
> Corrupted files are always the correct length but contain a relatively small
> percentage of scrambled bytes.  I looked for obvious patterns like newlines
> being altered or high-bit bytes being converted to or from UTF-8, but there
> is no obvious (to me, anyway) pattern in the failure.
> I have also tested with IE, FireFox, and Safari on both Windows and MacOS.
> The issue appears to be independent of client browser and OS.
> Looking at Java system properties, I notice that while the classpath and
> bootclasspath have the same jars lists on all servers, they are not listed
> in the same order (probably listed in directory order as the paths are
> constructed by a script that inspects lib directories.)
> Is anyone aware of classpath order dependencies that could break File
> Upload?
> Can anyone offer any suggestions about what *might* be breaking File Upload?
> Or what other questions I should be asking?  At the moment, I'm feeling
> rather stumped.

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