V value = (V) stream.readObject();
        values.add(value);
      }
    }
  }

  // Secret sauce for setting final fields; don't make it public.
  static <T> FieldSetter<T> getFieldSetter(Class<T> clazz, String fieldName) {
    try {
      Field field = clazz.getDeclaredField(fieldName);
      return new FieldSetter<>(field);
    } catch (NoSuchFieldException e) {

    Comparator<? super E> comparator = (Comparator<? super E>) requireNonNull(stream.readObject());
    Serialization.getFieldSetter(AbstractSortedMultiset.class, "comparator").set(this, comparator);
    Serialization.getFieldSetter(TreeMultiset.class, "range")
        .set(this, GeneralRange.all(comparator));
    Serialization.getFieldSetter(TreeMultiset.class, "rootReference")
        .set(this, new Reference<AvlNode<E>>());

    Comparator<? super E> comparator = (Comparator<? super E>) requireNonNull(stream.readObject());
    Serialization.getFieldSetter(AbstractSortedMultiset.class, "comparator").set(this, comparator);
    Serialization.getFieldSetter(TreeMultiset.class, "range")
        .set(this, GeneralRange.all(comparator));
    Serialization.getFieldSetter(TreeMultiset.class, "rootReference")
        .set(this, new Reference<AvlNode<E>>());

        V value = (V) stream.readObject();
        values.add(value);
      }
    }
  }

  // Secret sauce for setting final fields; don't make it public.
  static <T> FieldSetter<T> getFieldSetter(Class<T> clazz, String fieldName) {
    try {
      Field field = clazz.getDeclaredField(fieldName);
      return new FieldSetter<>(field);
    } catch (NoSuchFieldException e) {

    static final Serialization.FieldSetter<? super ImmutableMultimap<?, ?>> MAP_FIELD_SETTER =
        Serialization.getFieldSetter(ImmutableMultimap.class, "map");
    static final Serialization.FieldSetter<? super ImmutableMultimap<?, ?>> SIZE_FIELD_SETTER =
        Serialization.getFieldSetter(ImmutableMultimap.class, "size");
  }

  ImmutableMultimap(ImmutableMap<K, ? extends ImmutableCollection<V>> map, int size) {

  // makes sure it is not initialized unless an instance is deserialized.
  private static class FieldSettersHolder {
    static final FieldSetter<? super ConcurrentHashMultiset<?>> COUNT_MAP_FIELD_SETTER =
        Serialization.getFieldSetter(ConcurrentHashMultiset.class, "countMap");
  }

  /**
   * Creates a new, empty {@code ConcurrentHashMultiset} using the default initial capacity, load
   * factor, and concurrency settings.
   */

  @J2ktIncompatible
  private static final class SetFieldSettersHolder {
    static final Serialization.FieldSetter<? super ImmutableSetMultimap<?, ?>>
        EMPTY_SET_FIELD_SETTER =
            Serialization.getFieldSetter(ImmutableSetMultimap.class, "emptySet");
  }

  @GwtIncompatible // java.io.ObjectInputStream
  @J2ktIncompatible
  // Serialization type safety is at the caller's mercy.
  @SuppressWarnings("unchecked")

  @J2ktIncompatible
  private static final class SetFieldSettersHolder {
    static final Serialization.FieldSetter<? super ImmutableSetMultimap<?, ?>>
        EMPTY_SET_FIELD_SETTER =
            Serialization.getFieldSetter(ImmutableSetMultimap.class, "emptySet");
  }

  @GwtIncompatible // java.io.ObjectInputStream
  @J2ktIncompatible
  // Serialization type safety is at the caller's mercy.
  @SuppressWarnings("unchecked")