我在netbeans 7.0中创建了一个名为placementrecord的包。在这个包下我创建了几个表单，其中一个表单由于一些bindingGroup问题而没有运行。我对这个bindingGroup没有任何线索，所以我无法解决错误，也没有在其他任何地方得到适当的答案。
以下是 Login.java ：
public class Login extends javax.swing.JFrame {
/**
* Creates new form Login
*/
public Login() {
super("Placement Management System");
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.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
bindingGroup = new org.jdesktop.beansbinding.BindingGroup();
jTextField1 = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jPasswordField1 = new javax.swing.JPasswordField();
jLabel3 = new javax.swing.JLabel();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
getContentPane().add(jTextField1, new org.netbeans.lib.awtextra.AbsoluteConstraints(250, 10, 140, -1));
jLabel1.setFont(new java.awt.Font("Times New Roman", 1, 14));
jLabel1.setForeground(new java.awt.Color(0, 0, 153));
jLabel1.setText("STUDENTID:");
org.jdesktop.beansbinding.Binding binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, jLabel1, org.jdesktop.beansbinding.ObjectProperty.create(), jLabel1, org.jdesktop.beansbinding.BeanProperty.create("background"));
bindingGroup.addBinding(binding);
getContentPane().add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(140, 10, 90, 20));
jLabel2.setFont(new java.awt.Font("Times New Roman", 1, 14));
jLabel2.setForeground(new java.awt.Color(0, 0, 153));
jLabel2.setText("PASSWORD:");
getContentPane().add(jLabel2, new org.netbeans.lib.awtextra.AbsoluteConstraints(140, 40, 90, 20));
jButton1.setForeground(new java.awt.Color(0, 0, 153));
jButton1.setText("LOGIN");
jButton1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
getContentPane().add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(290, 170, 80, 30));
jPasswordField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jPasswordField1ActionPerformed(evt);
}
});
getContentPane().add(jPasswordField1, new org.netbeans.lib.awtextra.AbsoluteConstraints(250, 40, 140, -1));
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/new_login.jpg"))); // NOI18N
jLabel3.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
getContentPane().add(jLabel3, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 410, 300));
jButton2.setBackground(new java.awt.Color(255, 255, 255));
jButton2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/homricon9.jpg"))); // NOI18N
jButton2.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(255, 153, 0)));
getContentPane().add(jButton2, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 253, 40, 40));
bindingGroup.bind();
pack();
}// </editor-fold>
private void jPasswordField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Login().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPasswordField jPasswordField1;
private javax.swing.JTextField jTextField1;
private org.jdesktop.beansbinding.BindingGroup bindingGroup;
// End of variables declaration
}
运行错误此代码如下：
run:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
at java.lang.Class.cast(Class.java:2990)
at org.jdesktop.beansbinding.Binding.convertForward(Binding.java:1312)
at org.jdesktop.beansbinding.Binding.getSourceValueForTarget(Binding.java:844)
at org.jdesktop.beansbinding.Binding.refreshUnmanaged(Binding.java:1222)
at org.jdesktop.beansbinding.Binding.refresh(Binding.java:1207)
at org.jdesktop.beansbinding.AutoBinding.tryRefreshThenSave(AutoBinding.java:162)
at org.jdesktop.beansbinding.AutoBinding.bindImpl(AutoBinding.java:199)
at org.jdesktop.beansbinding.Binding.bindUnmanaged(Binding.java:959)
at org.jdesktop.beansbinding.Binding.bind(Binding.java:944)
at org.jdesktop.beansbinding.BindingGroup.bind(BindingGroup.java:143)
at Login.initComponents(Login.java:87)
at Login.<init>(Login.java:20)
at Login$3.run(Login.java:107)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
BUILD SUCCESSFUL (total time: 5 seconds)
答案 0 :(得分：3)
您已使用以下语句将 jLabel1 组件绑定到自身：
org.jdesktop.beansbinding.Binding binding = org.jdesktop.beansbinding.Bindings.createAutoBinding（org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE， jLabel1 ，org.jdesktop.beansbinding.ObjectProperty .create（）， jLabel1 ，org.jdesktop.beansbinding.BeanProperty.create（“background”））;
我建议删除 jLabel1 并在设计模式下重新创建。
或者，您可以右键单击标签并转到其“属性”。您应该看到一个名为binding的选项卡。单击它并在“绑定源”选项下选择“未绑定”，以取消绑定标签。
绑定可用于两个组件，例如，键入文本字段，并在两者绑定时将输入复制到textarea中。