can not get nsidomdocument from html file using mozilla browser instance

The following java works as java appliation. It spits out all tags in
the HTML file. When I integrate the app with eclipse application,  the
app does not pass the while loop.   Does anybody provide me a sample
code to get nsIDOMDocument from HTML file using Mozilla browser
instance.

public class TestSwtBrowser {
    public static void main(String[] args)  {

    	//Display display = new Display();
    	Display display = Display.getDefault();
        final Shell shell = new Shell(display);
    	//final Shell shell = new Shell();
		final Browser browser;

        browser = new Browser(shell, SWT.MOZILLA);


        if (browser.setUrl("C:\\eclipse\\eclipse\\TestHtml\\html\
\forms_e.html")) {

              browser.addProgressListener(new ProgressListener() {
               public void changed(ProgressEvent event) {
                	//Browser browser = (Browser)event.getSource();
                	nsIWebBrowser webBrowser =
(nsIWebBrowser)browser.getWebBrowser();
            		if (webBrowser == null) {
            			System.out.println("Could not get the nsIWebBrowser
from the Browser widget");

            		}
            		nsIDOMWindow window = webBrowser.getContentDOMWindow();
            		nsIDOMDocument document = window.getDocument();

                    //nsIDOMDocument document = browser.getDocument();

                    System.out.println(document);
                    //recursive call for displaying all children
        			System.out.println("before recursive call for displaying
all children");

        			nsIDOMNode fNode = ((nsIDOMNode) document).getFirstChild();
        			System.out.println("First Node="+fNode.getNodeName());
        			displayAllChildren(fNode);
        			nsIDOMNode lNode = ((nsIDOMNode) document).getLastChild();
        			System.out.println("Last Node="+lNode.getNodeName());
        			System.out.println("after recursive call for displaying all
children");
                }

                public void completed(ProgressEvent event) {
                 /*	nsIWebBrowser webBrowser =
(nsIWebBrowser)browser.getWebBrowser();
            		if (webBrowser == null) {
            			System.out.println("Could not get the nsIWebBrowser
from the Browser widget");

            		}
            		nsIDOMWindow window = webBrowser.getContentDOMWindow();
            		nsIDOMDocument document = window.getDocument();

                    //nsIDOMDocument document = browser.getDocument();

                    System.out.println(document);*/

                    //nsIDOMElement rootElement =
document.getDocumentElement();
                    //printElement(rootElement);
                }
            } );

        }

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();

    }

    private static void displayAllChildren(nsIDOMNode node) {
		nsIDOMNodeList nsiNodelist =   node.getChildNodes();
		long size = nsiNodelist.getLength();
		for (long c = 0; c < size; ++c) {
			nsIDOMNode child = nsiNodelist.item(c);
			System.out.println("tagName="+child.getNodeName());
			if (child.hasChildNodes()) {
			  displayAllChildren(child);
			}
	    }
	}