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Subject DO NOT REPLY [Bug 46075] New: FileUpload memory usage
Date Thu, 23 Oct 2008 10:35:54 GMT

           Summary: FileUpload memory usage
           Product: Tomcat 6
           Version: 6.0.18
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Servlet & JSP API

The DefaultFileItem class in pacakge org.apache.tomcat.util.http.fileupload
creates a ByteArrayOutputStream of the full threshold size for every control on
the submitted form. I have a form with 63 controls (checkboxes, text boxes and
one File input), and I set the threshold to 20 Meg to allow upload of large
image files into memory. I get an OutOfMemory exception since it tries to
allocate 63 lots of 20M, although only 1 control requires the requested size.

I think it would be much more sensible to create the ByteArrayOutputStream with
an initial size of only a few kilobytes size it automatically increases its
size as data is written to it.

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