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request.getParts("file")and was confused x_xMultipartConfigcondition is violated (eg:maxFileSize), callingrequest.getParameter()returns null. Is this on purpose? What if I get some regular (text) parameters before callinggetPart(and checking for anIllegalStateException)? This causes aNullPointerExceptionto be thrown before I have a chance to check for theIllegalStateException.String fileName = Paths.get(filePart.getSubmittedFileName()).getFileName().toString(); // MSIE fix.part similar to meReaderand/orWriterfor unclear reason. Do not do that. UseInputStream/OutputStreamover all place during reading and writing an uploaded file without massaging bytes into characters. A PDF file is not a character based text file or so. It is a binary file.