Cannot manually enter null date (in the textfield)

[tdbear]

To reproduce:

1. create a form that contains DatePicker component
2. click the calendar button and select any date
3. in the textfield, erase the date
4. call commitEdit(); it returns false; does not set the internal Date variable to null
5. call getDate(); it returns the last valid date selected in the calendar component rather than null

[tdbear]

public class MyDatePickerUI extends BasicDatePickerUI implements FocusListener {
static {
UIManager.put("microba.DatePickerUI", "MyDatePickerUI");
}
public static ComponentUI createUI(JComponent c) {
return new MyDatePickerUI();
}
@Override
protected void installComponents() {
super.installComponents();
field.addFocusListener(this);
}
public void focusGained(FocusEvent e) {
// No additional behavior
}
public void focusLost(FocusEvent e) {
if (((JFormattedTextField)e.getComponent()).getText().trim().equals("")) {
((JFormattedTextField)e.getComponent()).setValue(null);
}
}
}