将程序用作JAR文件时未保存pdf文件

Question

该程序在netbeans中运行良好，但是当通过jar文件pdf文件运行时，它会创建但为空。我也无法打开它。它说不支持该文件。

 public void print() {
    // TODO add your handling code here:
    try {
        document = new Document(PageSize.A4, 36, 36, 110, 80);
        writer = PdfWriter.getInstance(document, new FileOutputStream("Weekly Report.pdf"));
        //  ReportHeader();.
        HeaderFooterPageEvent event = new HeaderFooterPageEvent();
        writer.setPageEvent(event);
        document.open();
        // add table
        PdfPTable pdfTable = new PdfPTable(5);
        pdfTable.setTotalWidth(527);
        pdfTable.setLockedWidth(true);
        pdfTable.setWidths(new int[]{5, 3, 11, 5, 4});
        //adding table headers
        int H[] = {4, 0, 1, 2, 3};
        for (int i = 0; i < jTable_Display_Users.getColumnCount(); i++) {
            PdfPCell cell = new PdfPCell(new Paragraph(jTable_Display_Users.getColumnName(H[i]), bold));
            cell.setBackgroundColor(background_color);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setBorder(Rectangle.NO_BORDER);
            cell.setBorderWidth(1);
            cell.setFixedHeight(30);
            pdfTable.addCell(cell);

        }

        //extracting data from the JTable 

    } catch (DocumentException | FileNotFoundException e) {
        JOptionPane.showMessageDialog(null,e.getMessage());
    }

    //closePdf();
    document.close();
    writer.close();
}