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Exception during event dispatching

Posted on 2007-11-17
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Last Modified: 2008-02-01
when i run the code i get this error

Exception occurred during event dispatching:
java.lang.NullPointerException
      at src.com.AddNewCustomer$JMenuEmailActionListener.actionPerformed(AddNewCustomer.java:505)
      at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
      at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
      at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
      at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
      at javax.swing.AbstractButton.doClick(Unknown Source)
      at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
      at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
      at java.awt.Component.processMouseEvent(Unknown Source)
      at javax.swing.JComponent.processMouseEvent(Unknown Source)
      at java.awt.Component.processEvent(Unknown Source)
      at java.awt.Container.processEvent(Unknown Source)
      at java.awt.Component.dispatchEventImpl(Unknown Source)
      at java.awt.Container.dispatchEventImpl(Unknown Source)
      at java.awt.Component.dispatchEvent(Unknown Source)
      at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
      at java.awt.Container.dispatchEventImpl(Unknown Source)
      at java.awt.Window.dispatchEventImpl(Unknown Source)
      at java.awt.Component.dispatchEvent(Unknown Source)
      at java.awt.EventQueue.dispatchEvent(Unknown Source)
      at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
      at java.awt.Dialog$1.run(Unknown Source)
      at java.awt.Dialog$3.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.awt.Dialog.show(Unknown Source)
      at src.com.MainForm$1.actionPerformed(MainForm.java:819)
      at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
      at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
      at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
      at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
      at javax.swing.AbstractButton.doClick(Unknown Source)
      at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
      at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
      at java.awt.Component.processMouseEvent(Unknown Source)
      at javax.swing.JComponent.processMouseEvent(Unknown Source)
      at java.awt.Component.processEvent(Unknown Source)
      at java.awt.Container.processEvent(Unknown Source)
      at java.awt.Component.dispatchEventImpl(Unknown Source)
      at java.awt.Container.dispatchEventImpl(Unknown Source)
      at java.awt.Component.dispatchEvent(Unknown Source)
      at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
      at java.awt.Container.dispatchEventImpl(Unknown Source)
      at java.awt.Window.dispatchEventImpl(Unknown Source)
      at java.awt.Component.dispatchEvent(Unknown Source)
      at java.awt.EventQueue.dispatchEvent(Unknown Source)
      at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
      at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      at java.awt.EventDispatchThread.run(Unknown Source)
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Question by:zolf
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6 Comments
 
LVL 13

Accepted Solution

by:
Bart Cremers earned 250 total points
ID: 20304001
Can you post line 505 here? And a few before?

The exception says that something on the line is not instantiated (still is null), while you're trying to call a method on it.
0
 
LVL 23

Assisted Solution

by:rama_krishna580
rama_krishna580 earned 250 total points
ID: 20304751
At line 505 of AddNewCustomer.java; the variable/method call is expecting some value but its null....check this line what you have .....????

R.K
0
 

Author Comment

by:zolf
ID: 20306512
     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;
          }
      }
}
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Author Comment

by:zolf
ID: 20306522

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);
0
 

Author Comment

by:zolf
ID: 20306557

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
0
 

Author Comment

by:zolf
ID: 20306561

got it.

thanks mate
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