protected void doStart() {
            // Never starts!
          }

          @Override
          protected void doCancelStart() {
            assertThat(state()).isEqualTo(Service.State.STOPPING);
            notifyStopped();
          }

          @Override
          protected void doStop() {
            throw new AssertionError(); // Should not be called.
          }
        };

import org.eclipse.aether.util.ConfigUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Maven G level metadata generator.
 * <p>
 * Plugin metadata contains G level list of "prefix" to A mapping for plugins present under this G.
 *
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead
 */
@Deprecated(since = "4.0.0")
class PluginsMetadataGenerator implements MetadataGenerator {

두 가지 이상의 타입을 포함하는 `Union`으로 응답을 선언할 수 있습니다. 이는 응답이 그 중 하나의 타입일 수 있음을 의미합니다.

OpenAPI에서는 이를 `anyOf`로 정의합니다.

이를 위해 표준 Python 타입 힌트인 <a href="https://docs.python.org/3/library/typing.html#typing.Union" class="external-link" target="_blank">`typing.Union`</a>을 사용할 수 있습니다:

/// note | 참고

          </association>
        </field>
      </fields>
    </class>
    <class>
      <name>Lifecycle</name>
      <version>1.0.0+</version>
      <description>A custom lifecycle mapping definition.</description>
      <fields>
        <field>
          <name>id</name>
          <required>true</required>
          <version>1.0.0+</version>
          <type>String</type>

     * @return The {@link Path} to the artifact, or {@code null} if unavailable.
     */
    @Nullable
    Path getPath(@Nonnull Artifact artifact);

    /**
     * Returns a mapping of artifact coordinates to their corresponding resolution results.
     *
     * @return A {@link Map} where keys are {@link ArtifactCoordinates} and values are {@link ResultItem} instances.
     */
    @Nonnull

#### Enterprise integration

Provides cross-cutting integration with Gradle's commercial product.

#### IDE integration

Provides cross-cutting integration with IDEs and other tooling.

#### Build infrastructure

Provides build logic, libraries, test suites and infrastructure to support developing and releasing Gradle.

#### Documentation

      }

      Entry<?, ?> entry = (Entry<?, ?>) object;
      inverse.delegate.remove(entry.getValue());
      /*
       * Remove the mapping in inverse before removing from esDelegate because
       * if entry is part of esDelegate, entry might be invalidated after the
       * mapping is removed from esDelegate.
       */
      esDelegate.remove(entry);
      return true;
    }

    @Override

OpenAPIでは`anyOf`で定義されます。

そのためには、標準的なPythonの型ヒント<a href="https://docs.python.org/3/library/typing.html#typing.Union" class="external-link" target="_blank">`typing.Union`</a>を使用します:

{* ../../docs_src/extra_models/tutorial003.py hl[1,14,15,18,19,20,33] *}

## モデルのリスト

同じように、オブジェクトのリストのレスポンスを宣言することができます。

そのためには、標準のPythonの`typing.List`を使用する:

{* ../../docs_src/extra_models/tutorial004.py hl[1,20] *}

			// on the parent user, so we load them. This is not needed for the
			// initial server startup, however, it is needed for the case where
			// the STS account's policy mapping (for example in LDAP mode) may
			// be changed and the user's policy mapping in memory is stale
			// (because the policy change notification was missed by the current
			// server).
			//

   * returns an {@code ImmutableSortedMultiset<Multiset<String>>} containing one element (the given
   * multiset itself).
   *
   * <p>Despite the method name, this method attempts to avoid actually copying the data when it is
   * safe to do so. The exact circumstances under which a copy will or will not be performed are
   * undocumented and subject to change.
   *