if (!Collection.class.isAssignableFrom(parameterTypes[index]) || !isParameterized(index)) {
            return null;
        }
        final ParameterizedClassDesc pcd = parameterizedClassDescs[index].getArguments()[0];
        if (pcd == null) {
            return null;
        }
        return pcd.getRawClass();
    }

    @Override
    public Class<?> getKeyClassOfMap(final int index) {

      when (val protocol = sslSocket.applicationProtocol) {
        null, "" -> null
        else -> protocol
      }
    } catch (e: UnsupportedOperationException) {
      // https://docs.oracle.com/javase/9/docs/api/javax/net/ssl/SSLSocket.html#getApplicationProtocol--
      null
    }

  override fun trustManager(sslSocketFactory: SSLSocketFactory): X509TrustManager? {

     */
    private synchronized void initLifecycleMap() {
        if (lifecycleMap == null) {
            lifecycleMap = new HashMap<>();

            if (lifecycles != null) {
                for (Lifecycle lifecycle : lifecycles) {
                    lifecycleMap.put(lifecycle.getId(), lifecycle);
                }
            } else {

     *
     * @param request The repository request from which this cache was retrieved, must not be {@code null}.
     * @param key The key to use associate the data with, must not be {@code null}.
     * @param data The data to store in the cache, may be {@code null}.
     */
    void put(RepositoryRequest request, Object key, Object data);

    /**

        }

        @Test
        @DisplayName("Null parent with non-empty iterator causes NullPointerException during adapt")
        void nullParent_throwsNPE() {
            List<FileEntry> entries = Collections.singletonList(entry("x", SmbConstants.TYPE_SHARE));
            assertThrows(NullPointerException.class, () -> new ShareEnumIterator(null, entries.iterator(), null));
        }

  private val atomicRequestCount = AtomicInteger()

  private var serverSocketFactory_: ServerSocketFactory? = null
  private var serverSocket: ServerSocket? = null

  /** Non-null after [start]. */
  private var socketAddress_: InetSocketAddress? = null

  private var sslSocketFactory: SSLSocketFactory? = null
  private var clientAuth = CLIENT_AUTH_NONE

  private var closed: Boolean = false

  /**

   * <p>The {@code @Nullable} annotations on the {@code equalityGroup} parameter imply that the
   * objects, and the array itself, can be null. That is for programmer convenience, when the
   * objects come from factory methods that are themselves {@code @Nullable}. In reality neither the
   * array nor its contents can be null, but it is not useful to force the use of {@code
   * requireNonNull} or the like just to assert that.
   *

        if (groupId == null || version == null) {
            Element parentElement = root.child(PARENT).orElse(null);
            if (parentElement != null) {
                if (groupId == null) {
                    groupId = parentElement.childTextTrimmed(MavenPomElements.Elements.GROUP_ID);
                }
                if (version == null) {

     * @return the resolved NbtAddress or null if not found
     */

    public synchronized static NbtAddress getByName(final String host) {
        return getByName(new Name(host, 0x20, null));
    }

    synchronized static NbtAddress getByName(final Name name) {
        NbtAddress result = null;

        try {
            if (FILENAME != null) {
                final File f = new File(FILENAME);

    assertTrue("add(null) should return true", collection.add(null));
    expectAdded((E) null);
  }

  @CollectionFeature.Require(value = SUPPORTS_ADD, absent = ALLOWS_NULL_VALUES)
  public void testAdd_nullUnsupported() {
    assertThrows(NullPointerException.class, () -> collection.add(null));
    expectUnchanged();
    expectNullMissingWhenNullUnsupported("Should not contain null after unsupported add(null)");
  }