Object toOpenValue(Object value) throws OpenDataException {
    if (value == null) {
      return null;
    } else {
      return toNonNullOpenValue(value);
    }
  }
Convert an instance of targetType into an instance of openClass.

@return open class object
geode-core/src/main/java/org/apache/geode/management/internal/OpenTypeConverter.java