Java.lang.NullPointerException and javaBeans

Question

I think that part of the problem is due to some wonky requirements, but maybe not. There are three classes:
lab02.util.MySlider -- has a JSlider and a few other bits
lab02.util.ColorSelector -- has three JSliders and creates a Color (not a JColorChooser)
lab02.view.View -- the driver and JFrame, has two ColorSelectors and JTextField
However, a requirement is to have ColorSelector load as a jar file. The only way I could find of doing that was create two parallel projects: beans and lab2.
I added MySlider to the palette for ColorSelector, and then added ColorSelector to the palette. Switching over the lab2 project, I added ColorSelector to View. When I received the following error:
xception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at a00720398.lab02.util.MySlider.jSlider1StateChanged(MySlider.java:53)
        at a00720398.lab02.util.MySlider.access$000(MySlider.java:6)
        at a00720398.lab02.util.MySlider$1.stateChanged(MySlider.java:39)I then added both MySlider and ColorSlider to the Library Manager, and then added them to the library for lab2 project. Same result.
Is it a coding problem? A netbeans problem? A packaging problem? I've tried some System.out statements to try to track it down but couldn't get anywhere.
Keepin in mind that there are two projects with overlapping package structures, here's the code:
thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$ cat lab2beans/src/a00720398/lab02/util/MySlider.java
package a00720398.lab02.util;
import javax.swing.event.ChangeListener;
public class MySlider extends javax.swing.JPanel {
    private ChangeListener changeListener;
    /** Creates new form MySlider */
    public MySlider() {
        initComponents();
    public MySlider(ChangeListener changeListener) {
        this();
        this.changeListener = changeListener;
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc="Generated
Code">//GEN-BEGIN:initComponents
    private void initComponents() {
        bindingGroup = new org.jdesktop.beansbinding.BindingGroup();
        jLabel1 = new javax.swing.JLabel();
        jSlider1 = new javax.swing.JSlider();
        jTextField1 = new javax.swing.JTextField();
        jLabel1.setText("jLabel1");
        add(jLabel1);
        jSlider1.setMaximum(255);
        jSlider1.addChangeListener(new javax.swing.event.ChangeListener() {
            public void stateChanged(javax.swing.event.ChangeEvent evt) {
                jSlider1StateChanged(evt);
        add(jSlider1);
        org.jdesktop.beansbinding.Binding binding =
org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE,
jSlider1, org.jdesktop.beansbinding.ELProperty.create("${value}"), jTextField1,
org.jdesktop.beansbinding.BeanProperty.create("text"));
        bindingGroup.addBinding(binding);
        add(jTextField1);
        bindingGroup.bind();
    }// </editor-fold>//GEN-END:initComponents
    private void jSlider1StateChanged(javax.swing.event.ChangeEvent evt)
{//GEN-FIRST:event_jSlider1StateChanged
        // TODO add your handling code here:
        changeListener.stateChanged(evt);
    }//GEN-LAST:event_jSlider1StateChanged
    public void setName(String string) {
        jLabel1.setText(string);
    public int getValue() {
        return jSlider1.getValue();
    public void setValue(int value) {
        jSlider1.setValue(value);
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel jLabel1;
    private javax.swing.JSlider jSlider1;
    private javax.swing.JTextField jTextField1;
    private org.jdesktop.beansbinding.BindingGroup bindingGroup;
    // End of variables declaration//GEN-END:variables
thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$ cat lab2beans/src/a00720398/lab02/util/ColorSelector.java
package a00720398.lab02.util;
import java.awt.Color;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class ColorSelector extends javax.swing.JPanel implements ChangeListener {
    private ChangeListener changeListener;
    private Color color;
    /** Creates new form ColorSelector */
    public ColorSelector() {
        initComponents();
    public ColorSelector(Color color) {
        //initComponents();
        red = new a00720398.lab02.util.MySlider(this);
        green = new a00720398.lab02.util.MySlider(this);
        blue = new a00720398.lab02.util.MySlider(this);
        setLayout(new javax.swing.BoxLayout(this, javax.swing.BoxLayout.Y_AXIS));
        add(red);
        add(green);
        add(blue);
        this.color = color;
    public ColorSelector(Color color, ChangeListener changeListener) {
        //initComponents();
        this(color);
        this.changeListener = changeListener;
        //initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc="Generated
Code">//GEN-BEGIN:initComponents
    private void initComponents() {
        red = new a00720398.lab02.util.MySlider();
        green = new a00720398.lab02.util.MySlider();
        blue = new a00720398.lab02.util.MySlider();
        setLayout(new javax.swing.BoxLayout(this, javax.swing.BoxLayout.Y_AXIS));
        add(red);
        add(green);
        add(blue);
    }// </editor-fold>//GEN-END:initComponents
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private a00720398.lab02.util.MySlider blue;
    private a00720398.lab02.util.MySlider green;
    private a00720398.lab02.util.MySlider red;
    // End of variables declaration//GEN-END:variables
    public void stateChanged(ChangeEvent arg0) {
        throw new UnsupportedOperationException("Not supported yet.");
        //color = new Color(red.getValue(), green.getValue(), blue.getValue());
    public Color getColor() {
        System.out.println("getColor   " + color);
        return color;
thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$ cat lab2/src/a00720398/lab02/view/Lab02View.java
package a00720398.lab02.view;
import a00720398.lab02.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
public class Lab02View extends javax.swing.JFrame implements ChangeListener {
    private Color color;
    /** Creates new form Lab02View */
    public Lab02View() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc="Generated
Code">//GEN-BEGIN:initComponents
    private void initComponents() {
        jTextArea1 = new javax.swing.JTextArea();
        colorSelector1 = new a00720398.lab02.util.ColorSelector();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        getContentPane().setLayout(new javax.swing.BoxLayout(getContentPane(),
javax.swing.BoxLayout.Y_AXIS));
        jTextArea1.setColumns(20);
        jTextArea1.setRows(5);
        getContentPane().add(jTextArea1);
        getContentPane().add(colorSelector1);
        pack();
    }// </editor-fold>//GEN-END:initComponents
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                //new Lab02View().setVisible(true);
                JFrame frame = new Lab02View();
                frame.setLocationRelativeTo(null);
                frame.setSize(600,400);
                frame.setVisible(true);
    public void stateChanged(ChangeEvent arg0) {
        throw new UnsupportedOperationException("Not supported yet.");
        //jTextArea1.setBackground(colorSelector1.getColor());
        //color = colorSelector1.getColor();
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private a00720398.lab02.util.ColorSelector colorSelector1;
    private javax.swing.JTextArea jTextArea1;
    // End of variables declaration//GEN-END:variables
thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$ thanks,
Thufir

Answer 1

don't respond to this question, it's too "large". I'm creating another thread.