未正确分析java SNS消息属性

Question

我从AWS控制台发送带有以下消息属性的SNS消息：

Type: String
Name: is_data
Value: false

SNS由SQS接收，并在Lambda函数中解析

SQS消息正文包含以下字段：

   "MessageAttributes": {
        "is_data": {
            "Type": "String",
            "Value": "false"
        }

但是，当我尝试解析它时，它会抛出错误：

void f(SQSMessage sqsMessage) {
String messageBody = sqsMessage.getBody();
JsonNode body = objectMapper.readTree(messageBody);

Map<String, SNSEvent.MessageAttribute> messageAttributeMap =
            objectMapper.convertValue(body.get("MessageAttributes"),
                                      new TypeReference<Map<String, SNSEvent.MessageAttribute>>(){});
}

Caused by: java.lang.IllegalArgumentException: Unrecognized field "Type" (class com.amazonaws.services.lambda.runtime.events.SNSEvent$MessageAttribute), not marked as ignorable (2 known properties: "value", "type"])

我错过了什么

为什么SNS发送“Type”和“Vvalue”，而类需要“type”和“value”