/**
  * Method for determining whether null properties should be written out for a Bean of introspected
  * type. This is based on global feature (lowest priority, passed as argument) and per-class
  * annotation (highest priority).
  */
 public JsonSerialize.Inclusion findSerializationInclusion(JsonSerialize.Inclusion defValue) {
   if (_annotationIntrospector == null) {
     return defValue;
   }
   return _annotationIntrospector.findSerializationInclusion(_classInfo, defValue);
 }