I'm creating a pdf with iText 5 and want to add a footer. I did everything like the book "iText in action" in Chapter 14 says. 

There are no errors but the footer doesn't show up.
Can somebody tell me what I'm doing wrong?

My code:

```
public class PdfBuilder {

    private Document document;

    public void newDocument(String file) {
        document = new Document(PageSize.A4);
        writer = PdfWriter.getInstance(document, new FileOutputStream(file));
        MyFooter footerEvent = new MyFooter();
        writer.setPageEvent(footerEvent);
        document.open();

        ...

        document.close();
        writer.flush();
        writer.close();
    }

    class MyFooter extends PdfPageEventHelper {

    public void onEndPage(PdfWriter writer, Document document) {
        PdfContentByte cb = writer.getDirectContent();
        ColumnText.showTextAligned(cb, Element.ALIGN_CENTER, footer(), (document.right() - document.left()) / 2
                + document.leftMargin(), document.top() + 10, 0);

    }

    private Phrase footer() {
        Font ffont = new Font(Font.FontFamily.UNDEFINED, 5, Font.ITALIC);
        Phrase p = new Phrase("this is a footer");
        return p;
    }
}

```