My error is that the table headers of my two tables are not shown. Right now I am setting the header with new JTable(data, columnNames).

Here is an example which shows, my problem:

public class Test extends JFrame {

    private static final long serialVersionUID = -4682396888922360841L;

    private JMenuBar menuBar;

    private JMenu mAbout;

    private JMenu mMain;

    private JTabbedPane tabbedPane;

    public SettingsTab settings = new SettingsTab();

    private void addMenuBar() {

        menuBar = new JMenuBar();

        mMain = new JMenu("Main");
        mAbout = new JMenu("About");

        menuBar.add(mMain);
        menuBar.add(mAbout);

        setJMenuBar(menuBar);

    }

    public void createTabBar() {

        tabbedPane = new JTabbedPane(JTabbedPane.TOP);

        tabbedPane.addTab("Settings", settings.createLayout());

        add(tabbedPane);

        tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);

    }

    private void makeLayout() {

        setTitle("Test");
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(1000, 500));

        addMenuBar();
        createTabBar();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);

    }


    public void start() {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                makeLayout();   
            }
        });
    }

    public static void main(String[] args) {

        Test gui = new Test();
        gui.start();

    }

    public class SettingsTab extends JPanel {

        public JScrollPane createLayout() {
            JPanel panel = new JPanel(new MigLayout(""));
            JScrollPane sp = new JScrollPane(panel);
            sp.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

            panel.add(table1(), "growx, wrap");
            panel.add(Box.createRigidArea(new Dimension(0,10)));
            panel.add(table2());
            //          panel.add(Box.createRigidArea(new Dimension(0,10)));

            return sp;
        }

        public JPanel table1() {
            JPanel panel1 = new JPanel();

            String[] columnNames = {"First Name",
            "Last Name"};

            Object[][] data = {
                    {"Kathy", "Smith"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"}
            };

            final JTable table = new JTable(data, columnNames);
            tableProperties(table);
            panel1.add(table);

            panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));

            return panel1;
        }

        public JPanel table2() {
            JPanel panel1 = new JPanel();

            String[] columnNames = {"First Name",
            "Last Name"};

            Object[][] data = {
                    {"Kathy", "Smith"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"}
            };

            final JTable table = new JTable(data, columnNames);
            table.setPreferredScrollableViewportSize(new Dimension(500, 70));
            table.setFillsViewportHeight(true);
            tableProperties(table);

            panel1.add(table);

            panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));

            return panel1;
        }

        public void tableProperties(JTable table) {
            table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
            table.repaint();
            table.revalidate();
        }

    }
}

Any recommendations what I am doing wrong?