Fix Unexpected end of ZLIB input stream using Apache POI

March 26, 2022 One-minute read

Pretty sure the problem is you overwriting the file. Try to save on a different path. If you still want to overwrite the file, save to something else, delete the original, then rename the file you wrote into place:

    String tempFilename = createTempFile(template);
    String outputFilename = StringUtils.removeEndIgnoreCase(tempFilename, ".temp");
    FileUtils.forceDelete(new File(outputFilename));
    System.out.println(outputFilename);
    try (
            XWPFDocument document = new XWPFDocument(OPCPackage.open(tempFilename));
            OutputStream outputStream = FileUtils.openOutputStream(new File(outputFilename))
    ) {
        replaceInParagraphs(document);
        replaceInTables(document);
        document.write(outputStream);
        filenames.add(outputFilename);
    }
    FileUtils.forceDelete(new File(tempFilename));