Missing Table Header

Question

Hi,
Can someone tell my why I can't see my table headers. I have placed the table inside the JScrollPane but it still doesn't work.
package tablepractice;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
public class TableFrame
    private JScrollPane scrollPane;
    private TableData tableData;
    private JTable table;
    private JPanel tablePanel;
    public TableFrame()
        tablePanel = new JPanel();
        tableData = new TableData();
        table = new JTable(tableData);
        TableColumnModel tcm = table.getColumnModel();
        TableColumn tc = tcm.getColumn(TableData.DOB);
        MultiLineHeaderRenderer mlhr = new MultiLineHeaderRenderer();
        tc.setHeaderRenderer(mlhr);
        scrollPane = new JScrollPane(table);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        tablePanel.add(scrollPane);
        createAndShowGUI();
    public void addComponentsToPane(Container pane)
        pane.setLayout(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.fill = GridBagConstraints.HORIZONTAL;
        constraints.gridx              = 0;
        constraints.gridy              = 0;
        constraints.gridheight         = 4;
        constraints.gridwidth          = 5;
        pane.add(tablePanel, constraints);
    private void createAndShowGUI()
        //Make sure we have nice window decorations.
        JFrame frame = new JFrame("");
        frame.setDefaultLookAndFeelDecorated(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Set up the content pane.
        addComponentsToPane(frame.getContentPane());
        //Display the window.
        frame.pack();
        frame.setResizable(true);
        frame.setVisible(true);
    public static void main(String[] args)
        javax.swing.SwingUtilities.invokeLater(new Runnable()
            public void run()
                new TableFrame();
["code"]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Answer 1

Well the basics of displaying a table is straight forward:
JTable table = new JTable(5, 10);
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
So start with simply displaying a table and then add in you customizations to see where the problem is. For example:
1) Why do you create a 'tablePanel' and add the scroll pane to the tablePanel which you add to the contentPane. This is unnecessary.
2) Try your code without the GridBagLayout
3) You are using a custom header renderer. Try you code without the renderer.
4) You are overriding the viewport size.
Start simple add complexity and determine where the problem is rather than asking a generic 'whats wrong" question.