Две разделенные панели на вкладке

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.JList;
import javax.swing.JSplitPane;
import javax.swing.JLabel;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.event.ListSelectionEvent;


public class MenuPage extends JFrame{

    final static int extraWindowWidth = 100;

    JSplitPane jSplitPane, jSplitPane2,jSplitPane3,jSplitPane4;
    JPanel jPanel2a, jPanel2b, jPanel3;

    public static JFrame frame; 

    public MenuPage(){
    }

    private final JList<String> list1=new JList<>(new String[]{"A","B"});
    private final JList<String> list2 = new JList<>();
    private final List<DefaultListModel> models = new ArrayList<>();



    public void addComponentToPane(Container pane) {
        JTabbedPane tabbedPane = new JTabbedPane();



        // Create the "cards".
        JPanel card1 = new JPanel() {
            // Make the panel wider than it really needs, so
            // the window's wide enough for the tabs to stay
            // in one row.
            public Dimension getPreferredSize() {
                Dimension size = super.getPreferredSize();
                size.width += extraWindowWidth;
                return size;
            }
        };


         DefaultListModel<String> model1 = new DefaultListModel<>();
            model1.addElement("A1");
            model1.addElement("A2");
            model1.addElement("A3");
            models.add(model1);
            DefaultListModel<String> model2 = new DefaultListModel<>();
            model2.addElement("B1");
            model2.addElement("B2");
            models.add(model2);
            list2.setModel(model1);
            list1.addListSelectionListener((ListSelectionEvent e) -> {
                if (!e.getValueIsAdjusting()) {
                    list2.setModel(models.get(list1.getSelectedIndex()));
                }
            });






        jPanel2a = new JPanel();
        jPanel2b = new JPanel();
        jPanel3 = new JPanel();







        jSplitPane2 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, jPanel2a, jPanel2b);





        jSplitPane3 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, list1, list2);
        jSplitPane4 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,jSplitPane3,jPanel3);




        // panelin icerisine component eklendi
        JLabel lblHelloWorld = new JLabel("Hello World!");
        jPanel2a.add(lblHelloWorld);

        jSplitPane2.setOneTouchExpandable(true);
        jSplitPane2.setDividerLocation(100);


        jSplitPane3.setOneTouchExpandable(true);
        jSplitPane3.setDividerLocation(150);


        jSplitPane4.setOneTouchExpandable(true);
        jSplitPane4.setDividerLocation(300);



        JPanel card3 = new JPanel();
        JPanel card4 = new JPanel();
        JPanel card5 = new JPanel();
        JPanel card6 = new JPanel();
        JPanel card7 = new JPanel();
        JPanel card8 = new JPanel();



        card3.add(jSplitPane3,jSplitPane4);


        tabbedPane.addTab("Main", jSplitPane2);

        tabbedPane.addTab("Leagues",jSplitPane4);


        tabbedPane.addTab("Teams",card3 );
        tabbedPane.addTab("Ratios", card4);
        tabbedPane.addTab("Competitions", card5);
        tabbedPane.addTab("Analyze", card6);
        tabbedPane.addTab("Help", card7);
        tabbedPane.addTab("About", card8);

        pane.add(tabbedPane, BorderLayout.CENTER);


    }

    /**
     * Create the GUI and show it. For thread safety, this method should be
     * invoked from the event dispatch thread.
     */

    public static void createAndShowGUI() {
        // Create and set up the window.
        frame = new JFrame("BetAnalyzer");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(594, 310);

        // Create and set up the content pane.
        MenuPage demo = new MenuPage();
        demo.addComponentToPane(frame.getContentPane());

        // Display the window.
        frame.pack();
        frame.setVisible(true);
        frame.setBounds(100, 100, 635, 251);

    }
}

Я хочу, чтобы list1, list2 и jpanel3, которые принимают часть 2 JSplitPane, находились на вкладке лиги. В моем коде что-то не так. В макете может отображаться только jSplitPane3 или jSplitPane4.

Кроме того, я попытался добавить два JSplitPane в Box, затем поместил Box в панель вкладок, но это тоже не работает.