question: public void fireVetoableChange ( String name , Object oldValue , Object newValue ) throws PropertyVetoException { super . fireVetoableChange ( name , oldValue , newValue ) ; beanContextChildSupport . fireVetoableChange ( name , oldValue , newValue ) ; }
target:  Report a vetoable property update to any registered listeners. If anyone vetos the change, then fire a new event reverting everyone to the old value and then rethrow the PropertyVetoException. <P> No event is fired if old and new are equal and non-null. <P>