iText PDF/A-2 Java add total page count in footer - itext

Question

I need to add the total page count to a PDF/A-2 document created using iText in Java. The following code is being used:
public class HeaderFooterPageEvent extends PdfPageEventHelper {
Font fontHEADER = null;
/** The template with the total number of pages. */
PdfTemplate total;
public HeaderFooterPageEvent() {
try {
fontHEADER = new Font(BaseFont.createFont("OpenSans-Regular.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED), 8, Font.BOLD);
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
#Override
public void onOpenDocument(PdfWriter writer, Document document) {
total = writer.getDirectContent().createTemplate(30, 16);
super.onOpenDocument(writer, document);
}
#Override
public void onCloseDocument(PdfWriter writer, Document document) {
PdfContentByte cb = writer.getDirectContent();
ColumnText.showTextAligned(total, Element.ALIGN_RIGHT,
new Phrase(String.valueOf(writer.getPageNumber() - 1)),fontHEADER),
document.right() - document.rightMargin()+5,
document.bottom() - 10, 0);
super.onCloseDocument(writer, document);
}
}
And when creating the PDF the following code is called:
Document document = new Document(PageSize.A4, 15, 15, 30, 20);
PdfAWriter writer = PdfAWriter.getInstance(document, new FileOutputStream(dest), PdfAConformanceLevel.PDF_A_2A);
writer.createXmpMetadata();
writer.setTagged();
// add header and footer
HeaderFooterPageEvent event = new HeaderFooterPageEvent();
writer.setPageEvent(event);
document.open();
document.addLanguage("en-us");
File file = new File("sRGB_CS_profile.icm");
ICC_Profile icc = ICC_Profile
.getInstance(new FileInputStream(file));
writer.setOutputIntents("Custom", "", "http://www.color.org", "sRGB IEC61966-2.1", icc);
Paragraph p=new Paragraph("Page 1 content",fontEmbedded); //setting an embedded font
p.setSpacingBefore(30f);
document.add(p);
document.newPage();
document.add(new Paragraph("Content of next page goes here",fontEmbedded));
document.close();
Now when we add content on 2 pages and use document.newPage() to add the new page, runtime exception is generated The page 3 was requested but the document has only 2 pages. What is a solution to this problem?