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.grid.graphql;
  
  import graphql.ErrorClassification;
  import graphql.ErrorType;
  import graphql.GraphQLError;
  import graphql.language.SourceLocation;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  
  public class SessionNotFoundException extends RuntimeException implements GraphQLError {
  
    private final transient Optional<String> sessionId;
  
    public SessionNotFoundException(String message) {
      super(message);
      this.sessionId = Optional.empty();
    }
  
    public SessionNotFoundException(String message, String sessionId) {
      super(message);
      this.sessionId = Optional.of(sessionId);
    }
  
    @Override
    public Map<String, Object> getExtensions() {
      Map<String, Object> customAttributes = new LinkedHashMap<>();
      sessionId.ifPresent(s -> customAttributes.put("sessionId", s));
      return customAttributes;
    }
  
    @Override
    public List<SourceLocation> getLocations() {
      return Collections.emptyList();
    }
  
    @Override
    public ErrorClassification getErrorType() {
      return ErrorType.DataFetchingException;
    }
  }
  