I wanna to create PDF Report Error

I wanna to create PDF Report in my Java Desktop Application ...
Error :: (Uncompilable Source code - javax.swing.text.Document is abstract can't be instantiated)

 try {
            Document document = new Document();
            PdfWriter.getInstance(document, new FileInputStream("Report.pdf"));
            document.open();
            document.add(new Paragraph("hello World"));
            document.close();
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, e);
        }