@GwtIncompatible // java.io.ObjectInputStream private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException { stream.defaultReadObject(); expectedValuesPerKey = DEFAULT_VALUES_PER_KEY; int distinctKeys = Serialization.readCount(stream); Map<K, Collection<V>> map = Maps.newHashMap(); setMap(map); Serialization.populateMultimap(this, stream, distinctKeys); }