Maven uses Plexus Classworlds to build the class loader hierarchy, therefore some concepts used in this extensions
    stem from Plexus Classworlds originally.
    <p><i>Notice:</i> this documentation is generated from a Modello model but the code executed is not generated
    from this descriptor. Please report if you find anything wrong.</p>
  ]]></description>
  <defaults>
    <default>
      <key>package</key>

@GwtCompatible
abstract class CollectionFuture<V extends @Nullable Object, C extends @Nullable Object>
    extends AggregateFuture<V, C> {
  /*
   * We access this field racily but safely. For discussion of a similar situation, see the comments
   * on the fields of TimeoutFuture. This field is slightly different from the fields discussed

    return delegate().get(key, valueLoader);
  }

  /**
   * @since 11.0
   */
  @Override
  /*
   * <? extends Object> is mostly the same as <?> to plain Java. But to nullness checkers, they
   * differ: <? extends Object> means "non-null types," while <?> means "all types."
   */
  public ImmutableMap<K, V> getAllPresent(Iterable<? extends Object> keys) {

 *     <li>{@code war}: Packages the project as a Web Application Archive (WAR) file.</li>
 *     <li>{@code pom}: Indicates that the project does not produce a deployable artifact but is used for dependency management or as an aggregator.</li>
 *     <li>{@code maven-plugin}: Packages the project as a Maven plugin.</li>
 * </ul>
 *
 * <h2>Usage Example</h2>
 *
 * <pre>
 * {@code

// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

    return (ImmutableList<E>) EMPTY;
  }

  /**
   * Returns an immutable list containing a single element. This list behaves and performs
   * comparably to {@link Collections#singletonList}, but will not accept a null element. It is
   * preferable mainly for consistency and maintainability of your code.
   *
   * @throws NullPointerException if the element is null
   */
  public static <E> ImmutableList<E> of(E e1) {

        CloseableUtil.closeQuietly(in);

        // Verify no metadata extracted
        assertNull(extractData.getValues("title"));
        assertNull(extractData.getValues("author"));

        // But content should still be present
        final String content = extractData.getContent();
        assertTrue(content.contains("Sample Document"));
    }

    public void test_maxDepth() {