JTable in Headless Mode

Question

Is it possible to create a JTable (with the table header) in headless mode?
Thanks,
Steve Sinai

Answer 1

You don't know what headless mode is??? Then you're in the majority. It's one of those things I've seen mentioned in Swing books, but I've never had to deal with it before. On a server, we're trying to fill JTables with data, and then convert the JTables to pdf using iText. If you're wondering why we don't go straight to pdf using iText, thus bypassing JTables, you'll have to talk to our architect.
An explanation of headless mode is at the following link.
http://java.sun.com/developer/technicalArticles/J2SE/Desktop/headless/
I stole some example code from that site, and have been trying to use it to create a JTable. It's below. Some code that creates a JLabel works fine, and I commented it out. Now I'm trying to get it to create a JTable. The example displays the output on a printer, which is a little bit of a hassle, but it is what it is. If anyone can get the table (with header) to show up, it would be pretty nice.
import java.awt.*;
import java.io.*;
import java.awt.print.*;
import java.util.*;
import javax.swing.*;
public class HeadlessBasics
    public static void main(String[] args)
        // Set system property.
        // Call this BEFORE the toolkit has been initialized, that is,
        // before Toolkit.getDefaultToolkit() has been called.
        System.setProperty("java.awt.headless", "true");
        // This triggers creation of the toolkit.
        // Because java.awt.headless property is set to true, this
        // will be an instance of headless toolkit.
        Toolkit tk = Toolkit.getDefaultToolkit();
        // Standard beep is available.
        tk.beep();
        // Check whether the application is
        // running in headless mode.
        GraphicsEnvironment ge =
        GraphicsEnvironment.getLocalGraphicsEnvironment();
        System.out.println("Headless mode: " + ge.isHeadless());
          /**     The JLabel works.
                 final JLabel c = new JLabel("I'm a Label!");
                 Dimension dim = c.getPreferredSize();
                 c.setBounds(0,0,dim.width,dim.height);
                 Vector data = new Vector();
               for (int i = 0 ; i < 5 ; i++) {
                    Vector row = new Vector();
                    for (int j = 0 ; j < 4 ; j++) {
                         row.add(i+","+j);
                    data.add(row);
               Vector columns = new Vector();
               for (int i = 0 ; i < 4 ; i++) {
                    columns.add("Col "+i);
               JTable table = new JTable(data, columns);
               final JScrollPane c = new JScrollPane(table);
               Dimension dim = c.getPreferredSize();
               c.setBounds(0,0,dim.width,dim.height);
        // Print system is available.
        PrinterJob pj = PrinterJob.getPrinterJob();
        pj.setPrintable(new Printable()
            public int print(Graphics g, PageFormat pf, int pageIndex)
                if (pageIndex > 0)
                    return Printable.NO_SUCH_PAGE;
                ((Graphics2D)g).translate(pf.getImageableX(),
                                          pf.getImageableY());
                // Paint the canvas.
                c.paint(g);
                return Printable.PAGE_EXISTS;
        try
            pj.print();
        catch (Exception z)
            z.printStackTrace(System.err);
}