Itext 7 上的 ExceptionInInitializerError

Question

我尝试使用 itext 7.2.1 制作 PDF，这是我的代码：

    try{
        String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Kegiatan/" + eventName + ".pdf";

        File file = new File(path);
        file.mkdirs();

        PdfWriter writer = new PdfWriter(file);
        PdfDocument pdfDoc = new PdfDocument(writer);
        Document document = new Document(pdfDoc, new PageSize(612, 936).rotate());
        document.setMargins(0,0,0,0);

        //Title
        Paragraph paragraph = new Paragraph();
        paragraph.add(new Text(eventName).setFontSize(14).setTextAlignment(TextAlignment.CENTER).setBold());
        document.add(paragraph);
        document.close();
    }
    catch (IOException e) {
        e.printStackTrace();
    }

我收到此错误消息，指向 document.close()

java.lang.ExceptionInInitializerError

我该如何解决此问题？