无法构造 IntentResponse 实例，已验证对象为空

Question

我一直在关注 youtube 教程：https://www.youtube.com/watch?v=HkMi5xPyz1g&t=1533s

      public Object handleRequest(Map<String,Object> input, Context context) {
    LexRequest lexRequest= LexRequestFactory.createLexRequest(input);
    String orgbotcommand= lexRequest.getCommand()+" "+lexRequest.getOld_variable();

    String content = String.format("command recieved by %s is %s",
            lexRequest.getBotName(),
            orgbotcommand);

    Message message = new Message("Plain text",content);
    DialogueAction dialogueAction = new DialogueAction("Close", "Fulfilled or Failed", message );
    System.out.println(dialogueAction);

    return new LexRespond(dialogueAction);
}

以上是我正在使用的 java 代码。

它在使用 lambda 函数测试事件进行测试时为我提供了所需的输出，但是当我尝试从我的 lex bot 调用此 lambda 函数时，它抛出以下错误：

An error has occurred: Invalid Lambda Response: Received invalid response 
from Lambda: Can not construct instance of IntentResponse, problem: The
validated object is null at [Source: {"dialogueAction":
{"type":"Close","fulfillmentState":"Fulfilled or Failed","message":
{"contentType":"Plain text","content":"command recieved by OrgBot is Delete asd"}}}; line: 1, column: 168]

lambda 测试事件的输出是：

{
  "dialogueAction": {
   "type": "Close",
   "fulfillmentState": "Fulfilled or Failed",
   "message": {
   "contentType": "Plain text",
  "content": "command recieved by OrgBotchatbot is delete asd"
   }
 }
}

我是 Amazan lex 和 lambda 的新手。请告诉我我做错了什么

Answer 1

这可能只是您的回复格式问题。查看 Response Format Docs.

首先，contentType需要'PlainText'或'SSML'。

所以把'Plain text'改成'PlainText'

    Message message = new Message("PlainText",content);

其次，fulfillmentState 需要 'Fulfulled' 或 'Failed'。

所以从 DialogueAction 行中删除 'or Failed' 为：

    DialogueAction dialogueAction = new DialogueAction("Close", "Fulfilled", message );

第三，dialogAction。 Lex 必须是美国人，因为它只接受将 'Dialogue' 拼写为 'Dialog' 时的响应。因此，在代码中更改您需要的内容，以便响应 returns this:

 {  
    "dialogAction": {
        "type": "Close",
        "fulfillmentState": "Fulfilled",
        "message": {
            "contentType": "PlainText",
            "content": "command recieved by OrgBotchatbot is delete asd"
        }
    }
};

Answer 2

输出格式必须遵循特定的最小布局。我使用以下两个函数来简化它。

当您准备好告诉 Lex 时，只需从任何函数调用它们

//SessionAttributes any session variables
//fulfillmentState - 'Fulfilled' or 'Failed' depending on if successful or not
//message - the actual response text you want lex to say/type


function close(sessionAttributes, fulfillmentState, message) {
    return {
        sessionAttributes,
        dialogAction: {
            type: 'Close',
            fulfillmentState,
            message,
        },
    };
}

function delegate(sessionAttributes, slots) {
    return {
        sessionAttributes,
        dialogAction: {
            type: 'Delegate',
            slots,
        },
    };
}

Answer 3

如果您使用的是 Lex v2，则预期的响应格式与 v1 不同。

见https://docs.aws.amazon.com/lexv2/latest/dg/lambda.html#lambda-response-format

{
    "sessionState": {
        "activeContexts": [
            {
                "name": "string",
                "contextAttributes": {
                    "key": "value"
                },
                "timeToLive": {
                    "timeToLiveInSeconds": number,
                    "turnsToLive": number
                }
            }
        ],
        "sessionAttributes": {
            "string": "string"
        },
        "dialogAction": {
            "slotToElicit": "string",
            "type": "Close | ConfirmIntent | Delegate | ElicitIntent | ElicitSlot"
        },
        "intent": {
            "confirmationState": "Confirmed | Denied | None",
            "name": "string",
            "slots": {
                "string": {
                    "value": {
                        "interpretedValue": "string",
                        "originalValue": "string",
                        "resolvedValues": [
                            "string"
                        ]
                    }
                },
                "string": {
                    "shape": "List",
                    "value": {
                        "originalValue": "string",
                        "interpretedValue": "string",
                        "resolvedValues": [
                            "string"
                        ]
                    },
                    "values": [
                        {
                            "shape": "Scalar",
                            "value": {
                                "originalValue": "string",
                                "interpretedValue": "string",
                                "resolvedValues": [
                                    "string"
                                ]
                            }
                        },
                        {
                            "shape": "Scalar",
                            "value": {
                                "originalValue": "string",
                                "interpretedValue": "string",
                                "resolvedValues": [
                                    "string"
                                ]
                            }
                        }
                    ]
                }
            }
        },
        "state": "Failed | Fulfilled | InProgress | ReadyForFulfillment"
    },
    "messages": [
        {
            "contentType": "CustomPayload | ImageResponseCard | PlainText | SSML",
            "content": "string",
            "imageResponseCard": {
                "title": "string",
                "subtitle": "string",
                "imageUrl": "string",
                "buttons": [
                    {
                        "text": "string",
                        "value": "string"
                    }
                ]
            }
        }
    ],
    "requestAttributes": {
        "string": "string"
    }
}

无法构造 IntentResponse 实例，已验证对象为空

Can not construct instance of IntentResponse, The validated object is null

java

aws-lambda

amazon-lex