content not allowed in prolog from document created by DOM when printing using flying saucer

Question

I'm trying to print some text using my flying saucer (https://xhtmlrenderer.dev.java.net). The document is generated using DOM-API but when the print starts there is a 'content not allowed in prolog' exception. What is the reason for this exception?

My code is this:

DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder;
documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.newDocument();
Element html = document.createElement("html");
document.appendChild(html);
Element body = document.createElement("body");
html.appendChild(body);
for (String paragraph : paragraphs) {
    Element paragraphTag = document.createElement("p");
    paragraphTag.setTextContent(paragraph);
    body.appendChild(paragraphTag);
}
XHTMLPanel panel = new XHTMLPanel();
panel.setDocument(document);

print(new XHTMLPrintable(panel));

The print method takes a Printable and puts it into a PrintJob.

Answer 1

The XHTMLPrintable does not work with Documents that just exist in RAM. The XHTMLPrintable trys to generate a URL using the given document. This 'url' is then used a document for the Graphics2DRenderer - fail. I then wrote my own XHTMLPrintable that takes a Document instead of a XHTMLPanel.