plz ,, I Need help here : Exception in thread "main" java.lang.NullPointerException

[Ema]

hi ,,

I created a form by using JFormDesigner,,
and i waana add some codes in Jcretor,, but its doesn't work with me??

please anyone can help me in that?

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
/*
 * Created by JFormDesigner on Thu Aug 25 22:59:29 GST 2011
 */

/**
 * @author ema 
 */
public class project1part6 extends JFrame {
	public project1part6() {
		initComponents();
	}

	private void initComponents() {
		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents

		label5 = new JLabel();
		label3 = new JLabel();
		label4 = new JLabel();
		label6 = new JLabel();
		label7 = new JLabel();
		button1 = new JButton();
		label8 = new JLabel();
		label9 = new JLabel();

		radioButton1 = new JRadioButton();

		//======== this ========
		Container contentPane = getContentPane();
		contentPane.setLayout(null);

		//---- label5 ----
		
		label5.setText("Step 6:Logo");
		label5.setFont(new Font("Aharoni", Font.BOLD, 36));
		contentPane.add(label5);
		label5.setBounds(30, 20, 210, label5.getPreferredSize().height);

		//---- label3 ----
		label3.setText("A logo is a graphical element (ideogram, symbol, emblem, icon, sign). It's one aspect ");
		label3.setHorizontalAlignment(SwingConstants.CENTER);
		label3.setFont(new Font("Aharoni", Font.ITALIC, 14));
		label3.setForeground(new Color(0, 204, 102));
		contentPane.add(label3);
		label3.setBounds(100, 68, 569, label3.getPreferredSize().height);

		//---- label4 ----
		label4.setText("of a company's commercial brand, or economic or academic entity, and its shapes, colors, fonts, ");
		label4.setHorizontalAlignment(SwingConstants.CENTER);
		label4.setFont(new Font("Aharoni", Font.ITALIC, 14));
		label4.setForeground(new Color(0, 204, 102));
		contentPane.add(label4);
		label4.setBounds(45, 86, 655, label4.getPreferredSize().height);

		//---- label6 ----
		label6.setText(" and images usually are different from others in a similar market.");
		label6.setHorizontalAlignment(SwingConstants.CENTER);
		label6.setFont(new Font("Aharoni", Font.ITALIC, 14));
		label6.setForeground(new Color(0, 204, 102));
		contentPane.add(label6);
		label6.setBounds(150, 103, 459, label6.getPreferredSize().height);

		//---- label7 ----
		label7.setText("It\u2019s important to realize, when your are choosing a logo design, that your logo is more than just the ");
		label7.setHorizontalAlignment(SwingConstants.CENTER);
		label7.setFont(new Font("Aharoni", Font.ITALIC, 14));
		label7.setForeground(new Color(255, 153, 0));
		contentPane.add(label7);
		label7.setBounds(15, 128, 699, label7.getPreferredSize().height);

		//---- button1 ----
		button1.setText("NEXT");
		button1.setForeground(new Color(255, 153, 0));
		button1.setFont(new Font("Tahoma", Font.BOLD, 22));
		contentPane.add(button1);
		button1.setBounds(455, 465, 282, button1.getPreferredSize().height);

		//---- label8 ----
		label8.setText("visual representation of your business name, it's will become one of your most valuable commercial assets. ");
		label8.setHorizontalAlignment(SwingConstants.CENTER);
		label8.setFont(new Font("Aharoni", Font.ITALIC, 14));
		label8.setForeground(new Color(255, 153, 0));
		contentPane.add(label8);
		label8.setBounds(10, 138, 719, label8.getPreferredSize().height);

		//---- label9 ----
		label9.setText("Choose a logo: ");
		label9.setForeground(new Color(0, 153, 255));
		label9.setFont(new Font("Aharoni", Font.BOLD, 22));
		contentPane.add(label9);
		label9.setBounds(30, 185, 170, label9.getPreferredSize().height);
		contentPane.add(separator1);
		separator1.setBounds(110, 168, 569, 20);

		//---- radioButton1 ----
		radioButton1.setText("text");
		contentPane.add(radioButton1);
		radioButton1.setBounds(new Rectangle(new Point(100, 245), radioButton1.getPreferredSize()));

		{ // compute preferred size
			Dimension preferredSize = new Dimension();
			for(int i = 0; i < contentPane.getComponentCount(); i++) {
				Rectangle bounds = contentPane.getComponent(i).getBounds();
				preferredSize.width = Math.max(bounds.x + bounds.width, preferredSize.width);
				preferredSize.height = Math.max(bounds.y + bounds.height, preferredSize.height);
			}
			Insets insets = contentPane.getInsets();
			preferredSize.width += insets.right;
			preferredSize.height += insets.bottom;
			contentPane.setMinimumSize(preferredSize);
			contentPane.setPreferredSize(preferredSize);
		}
		pack();
		setLocationRelativeTo(getOwner());
		// JFormDesigner - End of component initialization  //GEN-END:initComponents
	}

	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
	private JLabel label5;
	private JLabel label3;
	private JLabel label4;
	private JLabel label6;
	private JLabel label7;
	private JButton button1;
	private JLabel label8;
	private JLabel label9;
	private JComponent separator1;
	private JRadioButton radioButton1;
	// JFormDesigner - End of variables declaration  //GEN-END:variables
	
	public static void main (String[] args) {
		
		project1part6 frame = new project1part6();
	frame.setVisible(true);
	
	
		
	}
}

[sunde887]

Some advice: show the exact error message you receive(copy/paste it in code tags here). Highlight the line which throws the exception. Try tracing the exception to the root, somewhere you have a variable which is not initialized and you are calling a method on it, which throws NullPointerException.

[Ema]

this what i got

Exception in thread "main" java.lang.NullPointerException
    at java.awt.Container.addImpl(Container.java:1041)
    at java.awt.Container.add(Container.java:365)
    at project1part6.initComponents(project1part6.java:96)
    at project1part6.<init>(project1part6.java:15)
    at project1part6.main(project1part6.java:136)

[Ema]

thanks i do fixed it