Solved

Exception during event dispatching

Posted on 2007-11-17
6
436 Views
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)
0
Comment
Question by:zolf
  • 4
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;
          }
      }
}
0
Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 

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
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Way to decrease size of apk file 9 88
tomcat startup error 5 106
jsp insert to database example 2 47
maven not picking latest jar instead picking old jar from .m2 12 22
Java contains several comparison operators (e.g., <, <=, >, >=, ==, !=) that allow you to compare primitive values. However, these operators cannot be used to compare the contents of objects. Interface Comparable is used to allow objects of a cl…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:

820 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question