I suppose I should add that I did directory deployment and not a WAR file. Also, this is the snippet:
zip_file_name=_at_upload_file.file_name
directory = "public/data"
zip_file_name=File.join(directory, zip_file_name)
File.open(zip_file_name, "wb") { |f| f.write(@upload_file.file_contents) }
Blows up trying to save the file (last line).
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