Amazon JSONの逆シリアル化Amazon Lex AWSラムダフック

Question

AWS Lexラムダフックに実装されているデシリアライゼーションに問題があります。ユーザー入力を検証するAWSラムダ関数がありますが、JSONMappingエラーが発生しています。

{ 
    "currentIntent": { 
    "name": "intent-name", 
    "slots": { 
     "slot-name": "value", 
     "slot-name": "value", 
     "slot-name": "value" 
    }, 
    "confirmationStatus": "None, Confirmed, or Denied (intent confirmation, if configured)", 
    }, 
    "bot": { 
    "name": "bot-name", 
    "alias": "bot-alias", 
    "version": "bot-version" 
    }, 
    "userId": "User ID specified in the POST request to Amazon Lex.", 
    "inputTranscript": "Text used to process the request", 
    "invocationSource": "FulfillmentCodeHook or DialogCodeHook", 
    "outputDialogMode": "Text or Voice, based on ContentType request header in runtime API request", 
    "messageVersion": "1.0", 
    "sessionAttributes": { 
    "key1": "value1", 
    "key2": "value2" 
    } 
} 

そして、このJSONをデシリアライズのための私のJava Beanは次のとおりです： レックスのJSONは、このようなものですハンドラクラスで

public class RequestInput { 
    public class CurrentIntent { 
     @JsonProperty("name") 
     String name; 
     @JsonProperty("slots") 
     Map<String, String> slots; 
     @JsonProperty("confirmationStatus") 
     String confirmationStatus; 

     public CurrentIntent(@JsonProperty("name") String name, @JsonProperty("slots") Map<String, String> slots, @JsonProperty("confirmationStatus") String confirmationStatus) { 
      this.name = name; 
      this.slots = slots; 
      this.confirmationStatus = confirmationStatus; 
     } 
    } 

    @JsonProperty("currentIntent") 
    CurrentIntent currentIntent; 
    @JsonProperty("bot") 
    Map<String, String> bot; 
    @JsonProperty("userId") 
    String userId; 
    @JsonProperty("inputTranscript") 
    String inputTranscript; 
    @JsonProperty("invocationSource") 
    String invocationSource; 
    @JsonProperty("outputDialogMode") 
    String outputDialogMode; 
    @JsonProperty("messageVersion") 
    String messageVersion; 
    @JsonProperty("sessionAttributes") 
    Map<String, String> sessionAttributes; 

    @JsonCreator 
    public RequestInput(@JsonProperty("currentIntent") CurrentIntent currentIntent, @JsonProperty("bot") Map<String, String> bot, 
         @JsonProperty("userId") String userId, @JsonProperty("inputTranscript") String inputTranscript, 
         @JsonProperty("invocationSource") String invocationSource, @JsonProperty("outputDialogMode") String outputDialogMode, 
         @JsonProperty("messageVersion") String messageVersion, @JsonProperty("sessionAttributes") Map<String, String> sessionAttributes) { 
     this.currentIntent = currentIntent; 
     this.bot = bot; 
     this.userId = userId; 
     this.inputTranscript = inputTranscript; 
     this.invocationSource = invocationSource; 
     this.outputDialogMode = outputDialogMode; 
     this.messageVersion = messageVersion; 
     this.sessionAttributes = sessionAttributes; 
    } 

    @Override 
    public String toString() { 
     return "Intent " + currentIntent.toString() + "; Bot " + bot.toString() + "; InputTranscript " + inputTranscript; 
    } 
} 

私はちょうどRequestInput.toString（）メソッドを呼び出すようにしようと、しかし、私はこのエラーが発生し続ける：

An error occurred during JSON parsing: java.lang.RuntimeException 
java.lang.RuntimeException: An error occurred during JSON parsing 
Caused by: java.io.UncheckedIOException: com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.comelit.lex.LexIntercomCallValidate$RequestInput]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?) 
at [Source: lambdainternal.util.NativeMemoryAsInputStream@55d56113; line: 1, column: 2] 
Caused by: com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.comelit.lex.LexIntercomCallValidate$RequestInput]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?) 
at [Source: lambdainternal.util.NativeMemoryAsInputStream@55d56113; line: 1, column: 2] 
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148) 
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1106) 
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:296) 
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:133) 
at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1511) 
at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1102) 

Answer 1

RequestInputクラスにデフォルトのコンストラクタを追加します。このエラーは、一般に、受信したJSONにマップされるクラスをインスタンス化できないことを示します。

public RequestInput() {}