code: public final synchronized VetoableChangeListener[] getVetoableChangeListeners(String propertyName) {
          if (vetoSupport == null) {
              return new VetoableChangeListener[0];
          }
          return vetoSupport.getVetoableChangeListeners(propertyName);
      }
docs: Returns an array of all the listeners which have been associated with the named property.
  
  @param propertyName the name of the property to lookup listeners
  @return all of the {@code VetoableChangeListeners} associated with the named property or an
  empty array if no listeners have been added
  
  @see #addVetoableChangeListener(String, VetoableChangeListener)
  @see #removeVetoableChangeListener(String, VetoableChangeListener)
  @see #getVetoableChangeListeners()