stream.defaultReadObject();
    expectedValuesPerKey = DEFAULT_VALUES_PER_KEY;
    int distinctKeys = stream.readInt();
    Map<K, Collection<V>> map = new HashMap<>();
    setMap(map);
    Serialization.populateMultimap(this, stream, distinctKeys);
  }

  @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;

    stream.defaultReadObject();
    keyComparator = requireNonNull((Comparator<? super K>) stream.readObject());
    valueComparator = requireNonNull((Comparator<? super V>) stream.readObject());
    setMap(new TreeMap<K, Collection<V>>(keyComparator));
    Serialization.populateMultimap(this, stream);
  }

  @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;

      stream.defaultReadObject();
      factory = (Supplier<? extends Collection<V>>) requireNonNull(stream.readObject());
      Map<K, Collection<V>> map = (Map<K, Collection<V>>) requireNonNull(stream.readObject());
      setMap(map);
    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  /**
   * Creates a new {@code ListMultimap} that uses the provided map and factory. It can generate a

   */
  protected AbstractMapBasedMultimap(Map<K, Collection<V>> map) {
    checkArgument(map.isEmpty());
    this.map = map;
  }

  /** Used during deserialization only. */
  final void setMap(Map<K, Collection<V>> map) {
    this.map = map;
    totalSize = 0;
    for (Collection<V> values : map.values()) {
      checkArgument(!values.isEmpty());
      totalSize += values.size();
    }
  }

  private Entry<K, V> nullKeyEntry;
  private Entry<K, V> nullValueEntry;
  private Entry<K, V> nullKeyValueEntry;
  private Entry<K, V> presentKeyNullValueEntry;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    nullKeyEntry = entry(null, v3());
    nullValueEntry = entry(k3(), null);
    nullKeyValueEntry = entry(null, null);
    presentKeyNullValueEntry = entry(k0(), null);
  }

  private List<Entry<K, V>> containsNullValue;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    containsNullKey = singletonList(entry(null, v3()));
    containsNullValue = singletonList(entry(k3(), null));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAll_supportedNothing() {
    getMap().putAll(emptyMap());
    expectUnchanged();
  }

  private Entry<K, V> nullKeyEntry;
  private Entry<K, V> nullValueEntry;
  private Entry<K, V> nullKeyValueEntry;
  private Entry<K, V> presentKeyNullValueEntry;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    nullKeyEntry = entry(null, v3());
    nullValueEntry = entry(k3(), null);
    nullKeyValueEntry = entry(null, null);
    presentKeyNullValueEntry = entry(k0(), null);
  }

  private List<Entry<K, V>> entries;
  private Entry<K, V> a;
  private Entry<K, V> b;
  private Entry<K, V> c;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    navigableMap = (NavigableMap<K, V>) getMap();
    entries =
        copyToList(
            getSubjectGenerator()
                .getSampleElements(getSubjectGenerator().getCollectionSize().getNumElements()));

  private List<Entry<K, V>> containsNullValue;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    containsNullKey = singletonList(entry(null, v3()));
    containsNullValue = singletonList(entry(k3(), null));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAll_supportedNothing() {
    getMap().putAll(emptyMap());
    expectUnchanged();
  }

  private SortedMap<K, V> navigableMap;
  private Entry<K, V> a;
  private Entry<K, V> c;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    navigableMap = (SortedMap<K, V>) getMap();
    List<Entry<K, V>> entries =
        copyToList(
            getSubjectGenerator()