Problema ao transferir dados entre JFrames

package inventoryprogrampart5;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

/**
 *
 * @author Valmir Junior
 */
public class FrameCadastrateMovie extends JFrame {

    private static Movie movie;
    private static JPanel lbPanel;
    private static JPanel textFieldPanel;
    private static JPanel btnPanel;
    //create new JLabels.
    private JLabel lbMovieNumber = new JLabel("Movie Number:");
    private JLabel lbMovieName = new JLabel("Movie Name:");
    private JLabel lbMovieTitle = new JLabel("Movie Title:");
    private JLabel lbMovieQuantity = new JLabel("Movie Quantity:");
    private JLabel lbMovieUnitPrice = new JLabel("Unit Price:");
    private JLabel lbMovieMinimumStock = new JLabel("Minimum Stock:");
    //create the text fields.
    private JTextField jtfMovieNumber = new JTextField("", 30);
    private JTextField jtfMovieName = new JTextField("", 30);
    private JTextField jtfMovieTitle = new JTextField("", 30);
    private JTextField jtfMovieQuantity = new JTextField("", 30);
    private JTextField jtfMovieUnitPrice = new JTextField("", 30);
    private JTextField jtfMovieMinimumStock = new JTextField("", 30);
    //create the buttons.
    private JButton btnOk = new JButton("Add Movie");
    private JButton btnCancel = new JButton("Cancel");

    public FrameCadastrateMovie() {
        super();
        this.toInitialState();
    }

    public Movie getMovie() {
        return movie;
    }

    private void toInitialState() {
        //----------------------Sets the frame attributes-----------------------
        // set the size of the window - 400 is width, 300 is height
        this.setSize(300, 300);
        // set the title of the window
        this.setTitle("Movie");
        // center the form
        this.setLocationRelativeTo(null);
        //set the default close operation for this frame
        this.setDefaultCloseOperation(HIDE_ON_CLOSE);
        //store the frame components
        lbPanel = this.createLabelPanel();
        textFieldPanel = this.createFieldPanel();
        btnPanel = this.createButtonPanel();
        //add the frame components
        add(lbPanel, BorderLayout.WEST);
        add(textFieldPanel, BorderLayout.CENTER);
        add(btnPanel, BorderLayout.SOUTH);
    }

    private JPanel createLabelPanel() {

        //create a new JPanel to add the labels.
        JPanel labelPanel = new JPanel(new GridLayout(6, 1));
        //add the labels.
        labelPanel.add(lbMovieNumber);
        labelPanel.add(lbMovieName);
        labelPanel.add(lbMovieTitle);
        labelPanel.add(lbMovieQuantity);
        labelPanel.add(lbMovieUnitPrice);
        labelPanel.add(lbMovieMinimumStock);
        return labelPanel;
    }

    private JPanel createFieldPanel() {

        //create a new JPanel to add the Text Fields.
        JPanel txtFieldPanel = new JPanel(new GridLayout(6, 1));
        //add the text fileds to the textFieldPanel.
        txtFieldPanel.add(jtfMovieNumber);
        txtFieldPanel.add(jtfMovieName);
        txtFieldPanel.add(jtfMovieTitle);
        txtFieldPanel.add(jtfMovieQuantity);
        txtFieldPanel.add(jtfMovieUnitPrice);
        txtFieldPanel.add(jtfMovieMinimumStock);
        return txtFieldPanel;
    }

    private JPanel createButtonPanel() {
        //create an action listener to the buttons.
        class BtnListener implements ActionListener {

            public void actionPerformed(ActionEvent e) {
                if (e.getActionCommand().equals("Add")) {
                    try {
                        movie = new Movie();
                        movie.setItemNumber(Integer.parseInt(jtfMovieNumber.getText()));
                        movie.setItemName(jtfMovieName.getText());
                        movie.setTitle(jtfMovieTitle.getText());
                        movie.setQuantity(Integer.parseInt(jtfMovieQuantity.getText()));
                        movie.setUnitPrice(Double.parseDouble(jtfMovieUnitPrice.getText()));
                        movie.setLowStock(Integer.parseInt(jtfMovieMinimumStock.getText()));
//                        clearFields();
                        JOptionPane.showMessageDialog(null, "Movie Added");
                    } catch (NumberFormatException ex) {
                        JOptionPane.showMessageDialog(null, "Incorrect Values");
                    }
                } else if (e.getActionCommand().equals("Cancel")) {
                    dispose();
                }
            }
        }

        BtnListener btnListener = new BtnListener();
        btnOk.setActionCommand("Add");
        btnOk.addActionListener(btnListener);
        btnCancel.setActionCommand("Cancel");
        btnCancel.addActionListener(btnListener);
        //create the panel to add the buttons.
        JPanel buttonPanel = new JPanel();
        //add the buttons to the buttonPanel.
        buttonPanel.add(btnOk);
        buttonPanel.add(btnCancel);
        return buttonPanel;
    }

    public static void clearFields() {
        //get the components in textFieldPanel
        Component[] components = textFieldPanel.getComponents();
        JTextField jtf = new JTextField();
        //for each component in components
        for (Component component : components) {
            //if component is instance of JTextField
            if (component.getClass().equals(jtf.getClass())) {
                //clear text field text.
                jtf = (JTextField) component;
                jtf.setText("");
            }
        }
    }
}