List<E> expected = copyToList(array);
    expected.add(null);
    expectContents(expected);
  }

  /**
   * Returns the {@link Method} instance for {@link #testAdd_supportedNullPresent()} so that tests
   * can suppress it. See {@link CollectionAddTester#getAddNullSupportedMethod()} for details.
   */
  @J2ktIncompatible
  @GwtIncompatible // reflection

     * initialized by a call to {@link #initCause}.
     */
    public InterpolatorException() {}

    /**
     * Constructs a new InterpolatorException with the specified detail message.
     * The cause is not initialized, and may subsequently be initialized by
     * a call to {@link #initCause}.
     *
     * @param message the detail message. The detail message is saved for

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A {@link NavigableSet} whose contents will never change, with many other important properties
 * detailed at {@link ImmutableCollection}.
 *
 * <p><b>Warning:</b> as with any sorted collection, you are strongly advised not to use a {@link
 * Comparator} or {@link Comparable} type whose comparison behavior is <i>inconsistent with

import javax.annotation.CheckForNull;

/**
 * Utility methods for working with {@link Enum} instances.
 *
 * @author Steve McKay
 * @since 9.0
 */
@GwtIncompatible
@J2ktIncompatible
@ElementTypesAreNonnullByDefault
public final class Enums {

  private Enums() {}

  /**
   * Returns the {@link Field} in which {@code enumValue} is defined. For example, to get the {@code

    this.graph = graph;
    this.nodeIterator = graph.nodes().iterator();
  }

  /**
   * Called after {@link #successorIterator} is exhausted. Advances {@link #node} to the next node
   * and updates {@link #successorIterator} to iterate through the successors of {@link #node}.
   */
  final boolean advance() {
    checkState(!successorIterator.hasNext());
    if (!nodeIterator.hasNext()) {
      return false;

        if (className.length() > 1) {
            listener.warning(String.format("Could not generate link for unknown class '%s'", className));
        }
        Element element = document.createElement("classname");
        element.appendChild(document.createTextNode(className));
        return element;
    }

    public Node link(MethodMetaData method, GenerationListener listener) {

# Including WSGI - Flask, Django, others

You can mount WSGI applications as you saw with [Sub Applications - Mounts](sub-applications.md){.internal-link target=_blank}, [Behind a Proxy](behind-a-proxy.md){.internal-link target=_blank}.

For that, you can use the `WSGIMiddleware` and use it to wrap your WSGI application, for example, Flask, Django, etc.

## Using `WSGIMiddleware`

You need to import `WSGIMiddleware`.

import javax.annotation.meta.TypeQualifierDefault;

/**
 * Marks all "top-level" types as non-null in a way that is recognized by Kotlin. Note that this
 * unfortunately includes type-variable usages, so we also provide {@link ParametricNullness} to
 * "undo" it as best we can.
 */
@GwtCompatible
@Retention(RUNTIME)
@Target(TYPE)
@TypeQualifierDefault({FIELD, METHOD, PARAMETER})
@Nonnull

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

/**
 * Tests {@link AndArtifactFilter}.
 *
 */
class AndArtifactFilterTest {

    private ArtifactFilter newSubFilter() {
        return artifact -> false;
    }

    @Test
    void testEquals() {

import java.util.ArrayList;
import java.util.List;

import org.apache.maven.settings.Settings;

/**
 * Collects the output of the settings builder.
 *
 * @deprecated since 4.0.0, use {@link org.apache.maven.api.services.SettingsBuilder} instead
 */
@Deprecated(since = "4.0.0")
class DefaultSettingsBuildingResult implements SettingsBuildingResult {

    private Settings effectiveSettings;