A small prob...

Hi,
i am akila.i have a small problem with my program. i will copy both my program and error... If anybody can make it out... plz reply...
this is the program
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
@SuppressWarnings("serial")
public class Events extends JPanel implements ActionListener
     final static String newline="\n";
     JLabel l;
     JTextArea a;
     JButton b;
     Events()
          l = new JLabel("Just checkin");
          add(l,BorderLayout.BEFORE_FIRST_LINE);
          b = new JButton("This is it!!!");
          add(b,BorderLayout.AFTER_LINE_ENDS);
          b.addActionListener(this);
          a = new JTextArea(5,20);
          a.setEditable(true);
          add(a,BorderLayout.CENTER);
          JScrollPane scrollPane = new JScrollPane(a);
          add(scrollPane, a);
     public void actionPerformed(ActionEvent e)
          String s=e.getActionCommand();
          System.out.println(s);
          a.append(s+newline);
          a.setCaretPosition(a.getDocument().getLength());
     public static void Create()
          JFrame frame = new JFrame("Event handler trial");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          JComponent newContentPane = new Events();
          JMenuBar j = new JMenuBar();
          j.setPreferredSize(new Dimension(200,20));
          j.setBackground(new Color(100,100,100));
          j.setOpaque(true);
          frame.setJMenuBar(j);
          newContentPane.setOpaque(true); //content panes must be opaque
          frame.setContentPane(newContentPane);
          frame.pack();
          frame.setVisible(true);
     public static void main(String[] args)
          javax.swing.SwingUtilities.invokeLater(new Runnable()
               public void run()
                    Create();
This is the error...
This is it!!!
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
     at Events.actionPerformed(Events.java:41)
     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.plaf.basic.BasicButtonListener.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)

Hi akila. Your code compiles and runs fine when I tried it.
Which is line 41? (The stack trace is saying that something on that line is null.) The line "a.setCaretPosition(a.getDocument().getLength());" looks OK.

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