Java.lang.NullPointerException

Então galera !!! meu sistema tem umas 3 jtext fild e um j boton…
a intenção era Editar alguns dos valores no formulário e apagar o formulário e gerar um novo grupo de identificação que é atribuído sempre que clicar no JButton.

só que ele ta dando essa exception eu tive alguns problemas com essa parte do ID e num tava funfando mtu bem…
sera que tem a ve ???

pq esta dando essa exception ???
vlw galera espero ter sido claro abraço a todos…

segue o meu codigo:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * TaskEditorPanel.java
 *
 * Created on Oct 25, 2010, 11:13:51 AM
 */
package com.netbeansrcp.taskeditor;

import com.netbeansrcp.taskmodel.TaskImpl;
import com.netbeansrcp.taskmodel.newpackage.API.Task;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

/**
 *
 * @author jcsouza
 */
public class TaskEditorPanel extends javax.swing.JPanel {

    public static final String PROP_TASK = "TASK";
    private PropertyChangeSupport pcs;

    private Task task = new TaskImpl();
    private boolean noUpdate = false;
    private DocumentListener docListener = new DocumentListener() {

        @Override
        public void insertUpdate(DocumentEvent evt) {
            TaskEditorPanel.this.updateTask();
        }

        @Override
        public void removeUpdate(DocumentEvent evt) {
            TaskEditorPanel.this.updateTask();
        }

        @Override
        public void changedUpdate(DocumentEvent evt) {
            TaskEditorPanel.this.updateTask();
        }

    };
    @Override
    public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
        if (pcs == null) {
            pcs = new PropertyChangeSupport(this);
        }
        this.pcs.addPropertyChangeListener(listener);
    }

    @Override
    public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
        if (pcs != null) {
            this.pcs.removePropertyChangeListener(listener);
        }
    }

    
    /** Creates new form TaskEditorPanel */
    public TaskEditorPanel() {
        initComponents();
        this.updateForm();
    }

    private void updateTask() {
        if (this.noUpdate) {
            return;
        }
        this.task.setName(this.jTextField3.getText());
        Date due = null;
        try {
            due =
                    DateFormat.getDateInstance().parse(this.jTextField4.getText());
        } catch (ParseException exception) {
            due = new Date();
        }
        this.task.setDue(due);
        if (!this.jSlider1.getValueIsAdjusting()) {
            switch (this.jSlider1.getValue()) {
                case 0:
                    this.task.setPrio(Task.Priority.LOW);
                    break;
                case 1:
                    this.task.setPrio(Task.Priority.MEDIUM);
                    break;
                case 2:
                    this.task.setPrio(Task.Priority.HIGH);
            }
        }
        this.task.setProgr(this.jSlider2.getValue());
        this.task.setDescr(this.jTextArea1.getText());
    }

    private void updateForm() {
        this.noUpdate = true;
        this.noUpdate = false;

        this.jTextField1.setText(this.task.getId());
        this.jTextField2.setText(this.task.getParentId());
        this.jTextField3.setText(this.task.getName());
        this.jTextField4.setText(DateFormat.getDateInstance().format(this.task.getDue()));
        this.jTextArea1.setText(this.task.getDescr());
        if (Task.Priority.LOW.equals(this.task.getPrio())) {
            this.jSlider1.setValue(0);
        } else if (Task.Priority.MEDIUM.equals(this.task.getPrio())) {
            this.jSlider1.setValue(1);
        } else {
            this.jSlider1.setValue(2);
        }
        this.jSlider2.setValue(this.task.getProgr());
        
    }

    /** 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.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jSlider1 = new javax.swing.JSlider();
        jSlider2 = new javax.swing.JSlider();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jTextField4 = new javax.swing.JTextField();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jLabel6 = new javax.swing.JLabel();
        jLabel7 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();

        jSlider1.setMajorTickSpacing(1);
        jSlider1.setMaximum(2);
        jSlider1.setMinorTickSpacing(1);
        jSlider1.setPaintTicks(true);
        jSlider1.setSnapToTicks(true);
        jSlider1.setValue(0);
        jSlider1.addChangeListener(new javax.swing.event.ChangeListener() {
            public void stateChanged(javax.swing.event.ChangeEvent evt) {
                jSlider1StateChanged(evt);
            }
        });

        jSlider2.setMajorTickSpacing(25);
        jSlider2.setMinorTickSpacing(5);
        jSlider2.setPaintLabels(true);
        jSlider2.setPaintTicks(true);
        jSlider2.setSnapToTicks(true);
        jSlider2.setValue(0);
        jSlider2.addChangeListener(new javax.swing.event.ChangeListener() {
            public void stateChanged(javax.swing.event.ChangeEvent evt) {
                jSlider2StateChanged(evt);
            }
        });

        jTextField1.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jTextField1.text")); // NOI18N
        this.jTextField1.getDocument().addDocumentListener(this.docListener);

        jTextField2.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jTextField2.text")); // NOI18N
        this.jTextField2.getDocument().addDocumentListener(this.docListener);

        jTextField3.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jTextField3.text")); // NOI18N
        jTextField3.setEnabled(false);
        this.jTextField3.getDocument().addDocumentListener(this.docListener);

        jTextField4.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jTextField4.text")); // NOI18N
        jTextField4.setEnabled(false);
        this.jTextField4.getDocument().addDocumentListener(this.docListener);

        jTextArea1.setColumns(20);
        jTextArea1.setRows(5);
        jScrollPane1.setViewportView(jTextArea1);

        jLabel1.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jLabel1.text")); // NOI18N

        jLabel2.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jLabel2.text")); // NOI18N

        jLabel3.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jLabel3.text")); // NOI18N

        jLabel4.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jLabel4.text")); // NOI18N

        jLabel5.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jLabel5.text")); // NOI18N

        jLabel6.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jLabel6.text")); // NOI18N

        jLabel7.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jLabel7.text")); // NOI18N

        jButton1.setText(org.openide.util.NbBundle.getMessage(TaskEditorPanel.class, "TaskEditorPanel.jButton1.text")); // NOI18N
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(57, 57, 57)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jLabel1)
                    .addComponent(jLabel2)
                    .addComponent(jLabel3)
                    .addComponent(jLabel4)
                    .addComponent(jLabel5)
                    .addComponent(jLabel6)
                    .addComponent(jLabel7))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 295, Short.MAX_VALUE)
                        .addContainerGap())
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(jSlider2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 282, Short.MAX_VALUE)
                            .addComponent(jSlider1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 282, Short.MAX_VALUE)
                            .addComponent(jTextField4, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 282, Short.MAX_VALUE)
                            .addComponent(jTextField3, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 282, Short.MAX_VALUE)
                            .addComponent(jTextField2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 282, Short.MAX_VALUE)
                            .addComponent(jTextField1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 282, Short.MAX_VALUE))
                        .addGap(23, 23, 23))))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(280, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(32, 32, 32))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(6, 6, 6)
                        .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(6, 6, 6)
                        .addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(6, 6, 6)
                        .addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(6, 6, 6)
                        .addComponent(jLabel4, javax.swing.GroupLayout.DEFAULT_SIZE, 15, Short.MAX_VALUE))
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jSlider1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel5, javax.swing.GroupLayout.DEFAULT_SIZE, 36, Short.MAX_VALUE)
                        .addGap(11, 11, 11)))
                .addGap(13, 13, 13)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jSlider2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel6, javax.swing.GroupLayout.DEFAULT_SIZE, 36, Short.MAX_VALUE)
                        .addGap(11, 11, 11)))
                .addGap(3, 3, 3)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel7, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addGap(54, 54, 54))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addComponent(jButton1)
                .addGap(11, 11, 11))
        );
    }// </editor-fold>

    private void jSlider1StateChanged(javax.swing.event.ChangeEvent evt) {                                      
        this.updateTask();
    }                                     

    private void jSlider2StateChanged(javax.swing.event.ChangeEvent evt) {                                      
        this.updateTask();
    }                                     

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        Task oldTask = this.task;
        this.task = new TaskImpl();
        this.pcs.firePropertyChange(PROP_TASK, oldTask, this.task);
        this.updateForm();
    

    }                                        
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JSlider jSlider1;
    private javax.swing.JSlider jSlider2;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
    // End of variables declaration
}

bom dia, primeiro fera vc tem q entender oque é uma NullPointerException http://download.oracle.com/javase/1.4.2/docs/api/java/lang/NullPointerException.html

e poste também o stacktrace para podermos auxiliar melhor… mas acredito que apos ler o link acima vc mesmo será capaz de resolver, caso contrario, poste novamente

abrasssss

aprenda uma linguagem sem gerenciamento automático de memória primeiro, depois venha para o java.