Very small program will not show any PDF!

Question

Here is my program. I must do something wrong, but I cannot see what.
The JPanel remains gray. Any idea?. Thanks.
public class PDFViewer extends JFrame
public PDFViewer()
try
Container c = getContentPane();
Document document = new Document();
document.setUrl(new File("f.PDF").toURL());
JPanel area = document.getPeer();
area.setVisible(true);
c.add(new JScrollPane(area));
setSize(200, 250);
catch (Exception ex) {ex.printStackTrace(); }
public static void main(String[] args)
PDFViewer v = new PDFViewer();
v.setVisible(true);
}

Answer 1

Thank you for the answer. By testing your advice, I did the test on another pdf and it worked. In fact, I have a pb with the first pdf I used. I cannot view it with pdfgo library, but this pdf will show nicely with acrobat reader.
So now, I have a different problem.
Anyway, thank you.