extends AbstractMapTester<K, V> {
  private List<Entry<K, V>> containsNullKey;
  private List<Entry<K, V>> containsNullValue;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    containsNullKey = singletonList(entry(null, v3()));
    containsNullValue = singletonList(entry(k3(), null));
  }

  @MapFeature.Require(SUPPORTS_PUT)

import org.dbflute.cbean.ConditionBean;
import org.dbflute.cbean.coption.CursorSelectOption;
import org.dbflute.cbean.result.ListResultBean;
import org.dbflute.exception.FetchingOverSafetySizeException;
import org.dbflute.exception.IllegalBehaviorStateException;
import org.dbflute.util.DfTypeUtil;
import org.opensearch.action.DocWriteResponse.Result;
import org.opensearch.action.admin.indices.refresh.RefreshResponse;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;

import org.codelibs.core.exception.IORuntimeException;
import org.codelibs.core.exception.ResourceNotFoundRuntimeException;
import org.codelibs.core.jar.JarFileUtil;
import org.codelibs.core.net.URLUtil;

/**
 * リソース用のユーティリティクラスです。
 *
 * @author higa
 */

import org.dbflute.bhv.readable.EntityRowHandler;
import org.dbflute.cbean.ConditionBean;
import org.dbflute.cbean.result.ListResultBean;
import org.dbflute.cbean.result.PagingResultBean;
import org.dbflute.exception.IllegalBehaviorStateException;
import org.dbflute.optional.OptionalEntity;
import org.dbflute.util.DfTypeUtil;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.delete.DeleteRequestBuilder;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channel;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;

import org.codelibs.core.exception.IORuntimeException;

/**
 * {@link Channel}用のユーティリティです。
 *
 * @author koichik
 */
public abstract class ChannelUtil {

    /**
     * ファイルチャネルをメモリにマップした{@link ByteBuffer}を返します。
     *

import org.dbflute.bhv.readable.EntityRowHandler;
import org.dbflute.cbean.ConditionBean;
import org.dbflute.cbean.result.ListResultBean;
import org.dbflute.cbean.result.PagingResultBean;
import org.dbflute.exception.IllegalBehaviorStateException;
import org.dbflute.optional.OptionalEntity;
import org.dbflute.util.DfTypeUtil;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.delete.DeleteRequestBuilder;

import org.dbflute.bhv.readable.EntityRowHandler;
import org.dbflute.cbean.ConditionBean;
import org.dbflute.cbean.result.ListResultBean;
import org.dbflute.cbean.result.PagingResultBean;
import org.dbflute.exception.IllegalBehaviorStateException;
import org.dbflute.optional.OptionalEntity;
import org.dbflute.util.DfTypeUtil;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.delete.DeleteRequestBuilder;

    val requestBody =
      object : RequestBody() {
        override fun contentType(): MediaType? = null

        override fun writeTo(sink: BufferedSink) {
          throw IOException("boom") // Despite this exception, 'sink' is healthy.
        }
      }

    val callA =
      client.newCall(
        Request(
          url = server.url("/"),
          body = requestBody,
        ),
      )

<img src="/img/tutorial/websockets/image05.png">

## Verbindungsabbrüche und mehreren Clients handhaben

Wenn eine WebSocket-Verbindung geschlossen wird, löst `await websocket.receive_text()` eine `WebSocketDisconnect`-Exception aus, die Sie dann wie in folgendem Beispiel abfangen und behandeln können.

//// tab | Python 3.9+

```Python hl_lines="79-81"
{!> ../../docs_src/websockets/tutorial003_py39.py!}
```

////

    props=$3
    fess_parms="-Dfess"

    if [ "x$pidpath" != "x" ]; then
        fess_parms="$fess_parms -Dfess.pidfile=$pidpath"
    fi

    # Make sure we don't use any predefined locale, as we check some exception message strings and rely on english language
    # As those strings are created by the OS, they are dependent on the configured locale
    LANG=en_US.UTF-8
    LC_ALL=en_US.UTF-8

    export HOSTNAME=`hostname -s`