import org.jspecify.annotations.Nullable;

/**
 * Weak reference with a {@code finalizeReferent()} method which a background thread invokes after
 * the garbage collector reclaims the referent. This is a simpler alternative to using a {@link
 * ReferenceQueue}.
 *
 * @author Bob Lee
 * @since 2.0
 */
@J2ktIncompatible
@GwtIncompatible
public abstract class FinalizableWeakReference<T> extends WeakReference<T>
    implements FinalizableReference {

  }

  private abstract static class AtomicHelper {
    /** Performs an atomic compare-and-set of {@link AggregateFutureState#seenExceptionsField}. */
    abstract void compareAndSetSeenExceptions(
        AggregateFutureState<?> state, @Nullable Set<Throwable> expect, Set<Throwable> update);

    /** Performs an atomic decrement-and-get of {@link AggregateFutureState#remainingField}. */

If you have an older version, you would get errors when trying to use `Annotated`.

Make sure you [Upgrade the FastAPI version](../deployment/versions.md#upgrading-the-fastapi-versions){.internal-link target=_blank} to at least 0.95.1 before using `Annotated`.

///

## Declare metadata { #declare-metadata }

You can declare all the same parameters as for `Query`.

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
@NullUnmarked
public class TraverserTest {

  /**
   * The undirected graph in the {@link Traverser#breadthFirst(Object)} javadoc:
   *
   * {@snippet :
   * b ---- a ---- d
   * |      |
   * |      |
   * e ---- c ---- f
   * }
   */

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

   * but the latest value for each key. This class exists only so that we can use {@link
   * MultimapsCollectionTest#populateMultimapForGet(Multimap, String[])} and similar methods to
   * populate a map to be passed to {@link Multimaps#forMap(Map)}. All tests should run against the
   * result of {@link #build()}.
   */
  private static final class PopulatableMapAsMultimap<K, V> extends ForwardingMultimap<K, V> {

```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip

<a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> の第2引数は、デフォルトで返される値を指定します。

この引数を省略するとデフォルト値として`None`が返されますが、ここではデフォルト値として`"World"`を指定しています。

///

次に、このPythonプログラムを呼び出します。

//// tab | Linux, macOS, Windows Bash

import org.apache.maven.api.cli.Parser;
import org.apache.maven.api.cli.ParserRequest;
import org.apache.maven.api.services.MessageBuilderFactory;
import org.apache.maven.cling.invoker.logging.SystemLogger;
import org.apache.maven.jline.JLineMessageBuilderFactory;
import org.codehaus.plexus.classworlds.ClassWorld;

import static java.util.Objects.requireNonNull;

/**
 * The CLI "new-gen".
 */
public abstract class ClingSupport {

import org.codelibs.fess.crawler.entity.ResponseData;

/**
 * Interface representing a client for a web crawler.
 * This client is responsible for executing requests and handling responses.
 * It extends {@link AutoCloseable} to allow for resource management.
 */
public interface CrawlerClient extends AutoCloseable {

    /**
     * Sets the initialization parameters for the crawler client.
     *

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.crawler.exception;

/**
 * Exception thrown during sitemaps processing in the crawler.
 * This exception extends {@link org.codelibs.fess.crawler.exception.CrawlerSystemException}
 * and provides constructors for wrapping other exceptions or creating a new exception with a message.
 */
public class SitemapsException extends CrawlerSystemException {