Exception during event dispatching

     ActionListener JMenuEmailActionListener = new ActionListener(){
            public void actionPerformed(ActionEvent e)
            {
                  String str = e.getActionCommand();
                  
                  Map<String, String> mapping = new HashMap<String, String>();
                JTextField linkedTextField = textField_Email_1;
                //JMenuItem currentItem;
                String currentItem;

                  if(str.equals("Email 1"))
                  {                  
                        emailLabel_1.setText(str);
                        mapping.put(str, linkedTextField.getText());
                        System.out.println(str+"  ,    "+ linkedTextField.getText());
                    String source =  e.getSource().toString();
                   
                    if (mapping.containsKey(source))
                    {
                        linkedTextField.setText(mapping.get(source));
                        System.out.println("IF");
                    }
                    else
                    {
                        linkedTextField.setText("");
                        System.out.println("ELSE");
                    }

                    currentItem = source;

                  }
                  else if(str.equals("Email 2"))
                  {
                        emailLabel_1.setText(str);
                        mapping.put(str, linkedTextField.getText());
                        System.out.println(str+"  ,    "+ linkedTextField.getText());
                        String source =  e.getSource().toString();

                    if (mapping.containsKey(source))
                    {
                        linkedTextField.setText(mapping.get(source));
                        System.out.println("IF");
                    }
                    else
                    {
                        linkedTextField.setText("");
                        System.out.println("ELSE");
                    }

                    source =  e.getSource().toString();
                  }
                  else if(str.equals("Email 3"))
                  {
                        emailLabel_1.setText(str);
                        mapping.put(str, linkedTextField.getText());
                        System.out.println(str+"  ,    "+ linkedTextField.getText());
                        String source =  e.getSource().toString();

                    if (mapping.containsKey(source))
                    {
                        linkedTextField.setText(mapping.get(source));
                        System.out.println("IF");
                    }
                    else
                    {
                        linkedTextField.setText("");
                        System.out.println("ELSE");
                    }

                    source =  e.getSource().toString();
                  }
            }
      };
      
      class JMenuEmailActionListener implements ActionListener {
          private final Map<JMenuItem, String> mapping = new HashMap<JMenuItem, String>();
          private final JTextField linkedTextField;
          private final JLabel labelForTextField;
          private JMenuItem currentItem;

          public JMenuEmailActionListener(JTextField linkedTextField, JLabel labelForTextField, JMenuItem currentItem) {
              this.linkedTextField = linkedTextField;
              this.labelForTextField = labelForTextField;
              this.currentItem = currentItem;
          }

          public void actionPerformed(ActionEvent e) {        ////////////////  505   / //////////////
              mapping.put(currentItem, linkedTextField.getText());

              JMenuItem source = (JMenuItem) e.getSource();
              labelForTextField.setText(source.getActionCommand());

              if (mapping.containsKey(source)) {
                  linkedTextField.setText(mapping.get(source));
              } else {
                  linkedTextField.setText("");
              }

              currentItem = source;
          }
      }
}

emailLabel_1 = new JLabel();
            emailLabel_1.setText("Email 1");
            emailLabel_1.setBounds(512, 60, 43, 16);
            generalPane.add(emailLabel_1);
       
            JPopupMenuButton emailOpt = new JPopupMenuButton();
            JPopupMenu popupMenuEmail = new JPopupMenu();
            JMenuItem email_1 = new JMenuItem("Email 1");
            JMenuItem email_2 = new JMenuItem("Email 2");
            JMenuItem  email_3 = new JMenuItem("Email 3");
            
            ////email_1.setActionCommand("Email 1");
            ///email_2.setActionCommand("Email 2");
            ////email_3.setActionCommand("Email 3");
            
            ////email_1.addActionListener(JMenuEmailActionListener);
            ////email_2.addActionListener(JMenuEmailActionListener);
            ////email_3.addActionListener(JMenuEmailActionListener);
            
            //You can create it like this:

              ActionListener listener = new JMenuEmailActionListener(textField_Email_1, emailLabel_1, email_1);

      //and simply add it to the three menu items:

                  email_1.addActionListener(listener);
                  email_2.addActionListener(listener);
                  email_3.addActionListener(listener);

when i enter a value in the textfield for the first menu item and then select the second menu item i get this error and i did i system.out.println
public void actionPerformed(ActionEvent e)
          {
                 System.out.println(linkedTextField+ "        " +currentItem.getText());
              mapping.put(currentItem, linkedTextField.getText());

i get this

null        Email 1

got it.

thanks mate