static <K extends @Nullable Object, V extends @Nullable Object> void writeMultimap(
      Multimap<K, V> multimap, ObjectOutputStream stream) throws IOException {
    stream.writeInt(multimap.asMap().size());
    for (Map.Entry<K, Collection<V>> entry : multimap.asMap().entrySet()) {
      stream.writeObject(entry.getKey());
      stream.writeInt(entry.getValue().size());
      for (V value : entry.getValue()) {
        stream.writeObject(value);

  /**
   * {@inheritDoc}
   *
   * <p>Though the method signature doesn't say so explicitly, the returned map has {@link Set}
   * values.
   */
  @Override
  public Map<K, Collection<V>> asMap() {
    return super.asMap();
  }

  /**
   * Stores a key-value pair in the multimap.
   *
   * @param key key to store in the multimap
   * @param value value to store in the multimap

  /**
   * {@inheritDoc}
   *
   * <p>Though the method signature doesn't say so explicitly, the returned map has {@link Set}
   * values.
   */
  @Override
  public Map<K, Collection<V>> asMap() {
    return super.asMap();
  }

  /**
   * Stores a key-value pair in the multimap.
   *
   * @param key key to store in the multimap
   * @param value value to store in the multimap

            contextualLabel == 'Cannot locate tasks that match \':a:javadocJar\' as task \'javadocJar\' not found in project \':a\'. Some candidates are: \'javadoc\'.'
            additionalData.asMap == [ 'requestedPath' : ':a:javadocJar']
        }

        when:
        buildFile << '''
            subprojects {
                java { withJavadocJar() }
            }
        '''
        then:

        nonZeroKeys.add(key);
      }
    }
    assertEquals(ITERATIONS, map.size());
    assertTrue(map.asMap().containsValue(0L));

    map.removeAllZeros();
    assertFalse(map.asMap().containsValue(0L));
    assertEquals(ITERATIONS / 2, map.size());
    assertEquals(nonZeroKeys, map.asMap().keySet());
  }

  public void testClear() {
    AtomicLongMap<Object> map = AtomicLongMap.create();

  static <K extends @Nullable Object, V extends @Nullable Object> void writeMultimap(
      Multimap<K, V> multimap, ObjectOutputStream stream) throws IOException {
    stream.writeInt(multimap.asMap().size());
    for (Map.Entry<K, Collection<V>> entry : multimap.asMap().entrySet()) {
      stream.writeObject(entry.getKey());
      stream.writeInt(entry.getValue().size());
      for (V value : entry.getValue()) {
        stream.writeObject(value);

                (new NamespaceId('http://some.extra.info', 'foo')): 'anotherValue',
                (new NamespaceId('http://my.extra.info', 'bar')): 'barValue'
        ])

        expect:
        extraInfo.asMap() == [
                (new QName('http://my.extra.info', 'foo')): 'fooValue',
                (new QName('http://some.extra.info', 'foo')): 'anotherValue',
                (new QName('http://my.extra.info', 'bar')): 'barValue'

     * operation which should be limited to cases like diagnostics which are worthy of time.
     * @return a copy of this container, as a map.
     */
    Map<Attribute<?>, ?> asMap();

            assertProblem(it, "ERROR", false)
            fqid == 'compilation:java:java-compilation-error'
            details == 'warnings found and -Werror specified'
            solutions.empty
            additionalData.asMap == ["formatted": "error: warnings found and -Werror specified"]
        }

        // Based on the Java version, the types in the lint message will differ...
        String expectedType

  /**
   * {@inheritDoc}
   *
   * <p>Though the method signature doesn't say so explicitly, the returned map has {@link List}
   * values.
   */
  @Override
  public Map<K, Collection<V>> asMap() {
    return super.asMap();
  }

  /**
   * Compares the specified object to this multimap for equality.
   *
   * <p>Two {@code ListMultimap} instances are equal if, for each key, they contain the same values