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https://issues.apache.org/jira/browse/FILEUPLOAD-59?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622495#action_12622495
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Purushottam M. Nawle commented on FILEUPLOAD-59:
------------------------------------------------
Along with this the jar provides a base servlet class which does the file
uploading. The user needs to extend this class to add just business logic such
as implementing validation, process the uploaded file etc.
> [fileupload] Memory Issue
> -------------------------
>
> Key: FILEUPLOAD-59
> URL: https://issues.apache.org/jira/browse/FILEUPLOAD-59
> Project: Commons FileUpload
> Issue Type: Bug
> Affects Versions: 1.0 Final
> Environment: Operating System: All
> Platform: All
> Reporter: Vimil Saju
> Attachments: UploadTest.zip
>
>
> The reason for out of memory exception is that a FileItem object is created
> for
> each request parameter whether it is file or an ordinary string parameter.
> the
> FileItem object has a field of type DeferredFileStream which is initialized
> to
> 262144 bytes (256 Kb) so if there are around 1000 request parameters, around
> 256 MB of space will be required to hold the request parameters even though
> most parameters may require only 8 to 10 bytes of memory for storage.
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