Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException Java GUI Error


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I am trying to design a calculator in java. My code isn't finished but
I have designed a GUI, which works except for when i try to actually
calculate the result. When i press "=" on my calculator i receive the
above error. Here is my code:GUI:import javax.swing.*;import
java.awt.event.ActionListener;import java.awt.event.ActionEvent;import
java.awt.*;import java.io.IOException;public class CalcGUI extends
JFrame implements ActionListener { /* * GUI for calculator */// Create
varia
public class MainFrame extends JFrame {
public
DefaultTableModel historyModel;
public DefaultTableModel
dataModel;
public JTable historyTable;
public JTable
dataTable;
public JTableHeader header;
private void
createUI() {
browsersTabbedPane = new
BrowsersTabbedPane();

add(browsersTabbedPane.getTabPane(), CENTER);

addDefaultBrowserComponentForTabbedPane();

createActions();
add(createToolBar(),
BorderLayout.NORTH);
add(createStatusBar(),
BorderLayout.SOUTH);

add(createDataView(dataModel,dataTable, header),
BorderLayout.PAGE_END);
Java

I have tried to go over this my self but i do not know how to
resolve this.


I am getting this error when i try and run
my addressBookUi class.


Exception in thread
"AWT-EventQueue-0" java.lang.NullPointerException
at
addressBookUI.startComponents(addressBookUI.java:43)
at
addressBookUI.<init>(addressBookUI.java:6)
at
addressBookUI$2.run(addressBookUI.java:143)
at
java.awt.event.InvocationEvent.dispatch(Unknown Source)
at
java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at
java.awt.EventQueue.access$000(Unknown Source)
at
java.awt.EventQueue$3.run(Unknown Source)
at
java.awt.EventQueue$3.ru
Java

(I am new to java so please don't make your answer TOOOOOOO
CONFUSING!!!! :P.)
I just have created a game using eclipse and I
really wanted to make a fun game! I looked off of some tutorials that
helped me create this. The thing is I can't move in the game. I would
really appreciate help!
Here is the error I recieve while trying
to move using wasd in my game:


Exception in thread
"AWT-EventQueue-0" java.lang.NullPointerException
at
StickFireBasic.KeyAdapt.keyReleased(KeyAdapt.java:19)
at
java.awt.Component.processKeyEvent(Unknown Source)
at
javax.swing.JComponent.processKeyEvent(Unknown Source)
at
java.awt.Component
Java

I'm having an issue, when I run my application and click over the
JMenuBar I get the following exception, I'm not sure why because no
line at the exception point to my code, those lines are all from
JavaLibraries.
The exception points over the Event
Handler/Dispatche... so I gues maybe I'm not setting a configuration
over the JMenuBar, the JMenu and the JMenuItem.


Basically
my code:


menubarsita = new JMyMenuBar(); //
Instanciate the JMenuBar
session.buildMenu(menubarsita,this);
//Add the JMenu and the JMenuItems

this.setJMenuBar(menubarsita); // Add the menu bar to the JFrame />

The code fo

Java

My first draft of my application was that I have the actionListener
in the same class as class the one used to create my Jbutton in. this
worked fine but I wanted to tidy it up. having a controller class
which I create my frame and have my actionlistener in.

/>

controller class:


public class Controller extends
JPanel implements ActionListener {
GUI GUIClass;
public
Controller() {
// TODO Auto-generated constructor stub />}
//Main
//create frame
// actionListener
method below.....
public void actionPerformed(ActionEvent e)
{
Object src = e.getSource();
Java
I am trying to design a calculator in java. My code isn't finished but
I have designed a GUI, which works except for when i try to actually
calculate the result. When i press "=" on my calculator i receive the
above error. Here is my code:GUI:import javax.swing.*;import
java.awt.event.ActionListener;import java.awt.event.ActionEvent;import
java.awt.*;import java.io.IOException;public class CalcGUI extends
JFrame implements ActionListener { /* * GUI for calculator */// Create
varia
Java

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