FULL PRODUCT VERSION :
1.4.2, 1.5.0, 1.60

ADDITIONAL OS VERSION INFORMATION :
JDK issue

A DESCRIPTION OF THE PROBLEM :

The method firePropertyChange() for Objects in PropertyChangeSupport.java does not properly check for if oldValue == newValue prior to firing. In the case that oldValue and newValue are BOTH null the event should not be fired.


public void firePropertyChange(String propertyName,
Object oldValue, Object newValue) {
  if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
    return;
  }
  firePropertyChange(new PropertyChangeEvent(source, propertyName,
oldValue, newValue));
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Expect an additional check,

if ( oldValue == newValue ) {
  return;
}

REPRODUCIBILITY :
This bug can be reproduced always.
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