Receive no events from VetoableChangeListener.

Question

I select and deselect the radio button with mouseclick, but I receive no vetoable events. The method jRadioButton1VetoableChange was not called. I suppose the property "selected" must be changed, isn't it?
Do you know why?
package trySomething;
public class TryVetos extends javax.swing.JFrame {
    public TryVetos() {
        initComponents();
    private void initComponents() {
        jPanel1 = new javax.swing.JPanel();
        jRadioButton1 = new javax.swing.JRadioButton();
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        jRadioButton1.setText("jRadioButton1");
// ******* hier I add a VetoableChangeListener*******
        jRadioButton1.addVetoableChangeListener(new java.beans.VetoableChangeListener() {
            public void vetoableChange(java.beans.PropertyChangeEvent evt)
            throws java.beans.PropertyVetoException {
                jRadioButton1VetoableChange(evt);
        });[/b]
        jPanel1.add(jRadioButton1);
        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);
        pack();
// ******* and hier I become no events. Why? *******
    private void jRadioButton1VetoableChange(java.beans.PropertyChangeEvent evt) throws java.beans.PropertyVetoException {
        System.out.println("jRadioButton1VetoableChange");
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    public static void main(String args[]) {
        new TryVetos().show();
    private javax.swing.JPanel jPanel1;
    private javax.swing.JRadioButton jRadioButton1;

Answer 1

Hi,
a change of the property "selected" can't be vetoed. There will be fired a "normal" PropertyChangeEvent only.
There are only a few properties which can be vetoed in JDK. Take a look at the "Use" page of PropertyVetoException. There is only JInternalFrame listed but e.g. an TreeWillExpandListener of a JTree can throw an ExpandVetoException, too. (It doesn't throw a PropertyVetoException because IMHO it's not a property to be changed.)
Therefore you have to look at the doc very exactly to find out which property change can be vetoed and which one not. (Or even better: look at the sources of JDK!)
For your problem: maybe it's better to disable the RB when it's not valid to be selected.
Hope that helps,
Alex