Map<String, Object> dataMap = new HashMap<>();

        transformer.putResultDataBody(dataMap, "empty", "value1");

        String[] emptyArray = new String[] {};
        transformer.putResultDataBody(dataMap, "empty", emptyArray);

        Object result = dataMap.get("empty");
        assertTrue(result instanceof Object[]);
        Object[] resultArray = (Object[]) result;

    final Ordering<T> ordering;
    final List<T> strictlyOrderedList;
    final T[] emptyArray;

    Scenario(Ordering<T> ordering, List<T> strictlyOrderedList, T[] emptyArray) {
      this.ordering = ordering;
      this.strictlyOrderedList = strictlyOrderedList;
      this.emptyArray = emptyArray;
    }

    void testCompareTo() {
      testComparator(ordering, strictlyOrderedList);
    }

    final Ordering<T> ordering;
    final List<T> strictlyOrderedList;
    final T[] emptyArray;

    Scenario(Ordering<T> ordering, List<T> strictlyOrderedList, T[] emptyArray) {
      this.ordering = ordering;
      this.strictlyOrderedList = strictlyOrderedList;
      this.emptyArray = emptyArray;
    }

    void testCompareTo() {
      testComparator(ordering, strictlyOrderedList);
    }

    operator fun get(name: String): String? = commonGet(name)

    fun build(): Headers = commonBuild()
  }

  companion object {
    /** Empty headers. */
    @JvmField
    val EMPTY = Headers(emptyArray())

    /**
     * Returns headers for the alternating header names and values. There must be an even number of
     * arguments, and they must alternate between header names and values.
     */
    @JvmStatic

            return null;
        }
        final Level level = Level.toLevel(minLevel, Level.ERROR);
        return new LogNotificationAppender(name, filter, layout, true, Property.EMPTY_ARRAY, level);
    }

    return Spliterators.spliterator(this, SPLITERATOR_CHARACTERISTICS);
  }

  private static final Object[] EMPTY_ARRAY = {};

  @Override
  @J2ktIncompatible // Incompatible return type change. Use inherited (unoptimized) implementation
  public final Object[] toArray() {
    return toArray(EMPTY_ARRAY);
  }

  @CanIgnoreReturnValue
  @Override
  /*
   * This suppression is here for two reasons:
   *

    return Spliterators.spliterator(this, SPLITERATOR_CHARACTERISTICS);
  }

  private static final Object[] EMPTY_ARRAY = {};

  @Override
  @J2ktIncompatible // Incompatible return type change. Use inherited (unoptimized) implementation
  public final Object[] toArray() {
    return toArray(EMPTY_ARRAY);
  }

  @CanIgnoreReturnValue
  @Override
  /*
   * This suppression is here for two reasons:
   *