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.json.Json.MAP_TYPE;
  
  import java.util.Map;
  import java.util.logging.Logger;
  import org.openqa.selenium.docker.DockerException;
  import org.openqa.selenium.internal.Require;
  import org.openqa.selenium.json.Json;
  import org.openqa.selenium.remote.http.Contents;
  import org.openqa.selenium.remote.http.HttpResponse;
  
  class DockerMessages {
  
    private static final Json JSON = new Json();
    private static final Logger LOG = Logger.getLogger(DockerMessages.class.getName());
  
    private DockerMessages() {
      // Utility method
    }
  
    public static HttpResponse throwIfNecessary(
        HttpResponse response, String message, Object... args) {
      Require.nonNull("Response", response);
  
      if (response.isSuccessful()) {
        return response;
      }
  
      String userMessage = String.format(message, args);
      String exceptionMessage;
  
      try {
        Map<String, Object> value = JSON.toType(Contents.string(response), MAP_TYPE);
        message = (String) value.get("message");
        exceptionMessage = userMessage + "\n" + message;
      } catch (Exception e) {
        exceptionMessage = userMessage;
      }
  
      LOG.warning(exceptionMessage);
      throw new DockerException(exceptionMessage);
    }
  }
  