void afterUnmarshal(Unmarshaller unmarshaller, Object parent) {
    // Iterate through propertyTypes and remove any unrecognized property types
    // that may be introduced with custom service definitions
    propertyTypes.remove(null);
  }
The list of properties that use this property.
Password properties may be used by other properties in
the same config type or different config type, typically
when asking for user name and password pairs.
ambari-server/src/main/java/org/apache/ambari/server/state/PropertyInfo.java