code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  
  package org.openqa.selenium.docker.v1_41;
  
  import static org.openqa.selenium.docker.v1_41.V141Docker.DOCKER_API_VERSION;
  import static org.openqa.selenium.json.Json.JSON_UTF_8;
  import static org.openqa.selenium.json.Json.MAP_TYPE;
  import static org.openqa.selenium.remote.http.Contents.asJson;
  import static org.openqa.selenium.remote.http.HttpMethod.POST;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.logging.Logger;
  import java.util.stream.Collectors;
  import org.openqa.selenium.docker.Container;
  import org.openqa.selenium.docker.ContainerConfig;
  import org.openqa.selenium.docker.ContainerId;
  import org.openqa.selenium.docker.DockerException;
  import org.openqa.selenium.docker.DockerProtocol;
  import org.openqa.selenium.internal.Require;
  import org.openqa.selenium.json.Json;
  import org.openqa.selenium.json.JsonException;
  import org.openqa.selenium.remote.http.Contents;
  import org.openqa.selenium.remote.http.HttpHandler;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.http.HttpResponse;
  
  class CreateContainer {
    private static final Json JSON = new Json();
    private static final Logger LOG = Logger.getLogger(CreateContainer.class.getName());
    private final DockerProtocol protocol;
    private final HttpHandler client;
  
    public CreateContainer(DockerProtocol protocol, HttpHandler client) {
      this.protocol = Require.nonNull("Protocol", protocol);
      this.client = Require.nonNull("HTTP client", client);
    }
  
    public Container apply(ContainerConfig info) {
      HttpResponse res =
          DockerMessages.throwIfNecessary(
              client.execute(
                  new HttpRequest(POST, String.format("/v%s/containers/create", DOCKER_API_VERSION))
                      .addHeader("Content-Type", JSON_UTF_8)
                      .setContent(asJson(info))),
              "Unable to create container: ",
              info);
  
      try {
        Map<String, Object> rawContainer = JSON.toType(Contents.string(res), MAP_TYPE);
  
        if (!(rawContainer.get("Id") instanceof String)) {
          throw new DockerException("Unable to read container id: " + rawContainer);
        }
        ContainerId id = new ContainerId((String) rawContainer.get("Id"));
  
        if (rawContainer.get("Warnings") instanceof Collection) {
          Collection<?> warnings = (Collection<?>) rawContainer.get("Warnings");
          if (warnings.size() > 0) {
            String allWarnings =
                warnings.stream().map(String::valueOf).collect(Collectors.joining("\n", " * ", ""));
  
            LOG.warning(
                String.format("Warnings while creating %s from %s: %s", id, info, allWarnings));
          }
        }
  
        return new Container(protocol, id);
      } catch (JsonException | NullPointerException e) {
        throw new DockerException("Unable to create container from " + info);
      }
    }
  }
  