docs: public void setFieldConversionClassName(String fieldConversionClassName)
      {
          try
          {
              this.fieldConversion = (FieldConversion) ClassHelper.newInstance(fieldConversionClassName);
          }
          catch (Exception e)
          {
              throw new MetadataException(
                      "Could not instantiate FieldConversion class using default constructor", e);
          }
      }