code: protected boolean mapPropertyNameToFieldName(final String propertyName, final String fieldName) {
      // TODO add possible validation for the property name and field name of this Bean class.
      propertyNameToFieldNameMapping.put(propertyName, fieldName);
      return propertyNameToFieldNameMapping.containsKey(propertyName);
    }
docs: Creates a mapping from the specified property on this Bean class to one of the Bean object's fields.
  
  @param propertyName a String value specifying the name of a property on this Bean class.
  @param fieldName a String value specifying the name of the Bean object's field.
  @return a boolean value indicating whether the mapping between the property and field was successfully
  created.