Hey, André,
Thanks for your note.
After his second email, I understood better Konstantin's point (there
are subsequent exchanges, after the one you're quoting), and I agree
with you and him that the exception seems related to a file system
permission issue.
- when it starts doing this (writing to disk), it is going to create
this temporary file in the directory indicated by .setRepository().
If this is not explicitly set, it will default to "/".
So what happened on your first iteration, was that when the size
exceeded the default of 1 MB, it tried to create a temporary file in
"/", and failed because Tomcat does not have permission to write
there. From there came the (accurate) error message.
So, interestingly, I actually tried the opposite and simply removed the
setRepository() call altogether, to let fileupload use its default value
(which I had avoided doing for the reasons you list). I am no longer
getting the exception. I think that means the default value for
setRepository is not "/", but javax.servlet.context.tempdir or
java.io.tmpdir or another temp directory.
I still don't quite understand why setting the temp directory expressly
failed (as Tomcat had permission to write to it), and I haven't checked
the default temp directories yet to see if that is in fact where the
temp file is now being written (it should be written somewhere, since
the images have exceeded the threshold size). But this seems to confirm
that, as you both suggested, the exception results from a file system
permission.
Best wishes,
Paul
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