public void handlePotentialDeadlock(PotentialDeadlockException e) {
        logger.get().log(Level.SEVERE, "Detected potential deadlock", e);
      }
    },

    /**
     * Disables cycle detection. This option causes the factory to return unmodified lock
     * implementations provided by the JDK, and is provided to allow applications to easily
     * parameterize when cycle detection is enabled.
     *

   *
   * <p><b>{@code Stream} equivalent:</b> {@code stream.filter(type::isInstance).map(type::cast)}.
   * This does perform a little more work than necessary, so another option is to insert an
   * unchecked cast at some later point:
   *
   * <pre>
   * {@code @SuppressWarnings("unchecked") // safe because of ::isInstance check
   * ImmutableList<NewType> result =

   * Splitter.on(',').omitEmptyStrings().split(",a,,,b,c,,")} returns an iterable containing only
   * {@code ["a", "b", "c"]}.
   *
   * <p>If either {@code trimResults} option is also specified when creating a splitter, that
   * splitter always trims results first before checking for emptiness. So, for example, {@code

 */
@DoNotMock("Use Optional.of(value) or Optional.absent()")
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
public abstract class Optional<T> implements Serializable {
  /**
   * Returns an {@code Optional} instance with no contained reference.
   *
   * <p><b>Comparison to {@code java.util.Optional}:</b> this method is equivalent to Java 8's
   * {@code Optional.empty}.
   */
  public static <T> Optional<T> absent() {

   * Splitter.on(',').omitEmptyStrings().split(",a,,,b,c,,")} returns an iterable containing only
   * {@code ["a", "b", "c"]}.
   *
   * <p>If either {@code trimResults} option is also specified when creating a splitter, that
   * splitter always trims results first before checking for emptiness. So, for example, {@code

      super(spliterator);
    }

    @Override
    void forEachRemaining(Consumer<? super E> action) {
      spliterator.forEachRemaining(action);
    }

    @Override
    boolean tryAdvance(Consumer<? super E> action) {
      return spliterator.tryAdvance(action);
    }

    @Override
    @Nullable GeneralSpliterator<E> trySplit() {

    Method method = TwoArg.class.getMethod("normalNormal", String.class, Integer.class);
    for (TwoArg.Action first : TwoArg.Action.values()) {
      for (TwoArg.Action second : TwoArg.Action.values()) {
        TwoArg bar = new TwoArg(first, second);
        if (first.equals(TwoArg.Action.THROW_A_NPE) && second.equals(TwoArg.Action.THROW_A_NPE)) {
          verifyBarPass(method, bar); // require both params to throw NPE
        } else {

        return super.writeReplace();
      }
    };
  }

  @GwtIncompatible // serialization
  @Override
  public void forEach(Consumer<? super V> action) {
    checkNotNull(action);
    map.forEach((k, v) -> action.accept(v));
  }

  // redeclare to help optimizers with b/310253115
  @SuppressWarnings("RedundantOverride")
  @Override
  @J2ktIncompatible // serialization

    return new ImmutableMapEntrySet.RegularEntrySet<>(this, entries);
  }

  @Override
  public void forEach(BiConsumer<? super K, ? super V> action) {
    checkNotNull(action);
    entries.forEach(e -> action.accept(e.getKey(), e.getValue()));
  }

  @Override
  ImmutableSet<K> createKeySet() {
    return new ImmutableMapKeySet<>(this);
  }

  @Override

on:
  push:
    branches:
      - master
  pull_request:
    branches:
      - master

permissions:
  contents: read

jobs:
  test:
    permissions:
      actions: write  # for styfle/cancel-workflow-action to cancel/stop running workflows
      contents: read  # for actions/checkout to fetch code
    name: "${{ matrix.root-pom }} on JDK ${{ matrix.java }} on ${{ matrix.os }}"
    strategy:
      matrix: