AWS SNS发布到订阅的Lambda函数会记录空字段

试图将此发布到AWS论坛，但似乎我的帐户“尚未准备好”，无论这意味着什么 .

我已经设置了一个AWS Lambda函数（用Java编写），它接受POJO以允许自动反序列化JSON . 我正在使用的测试JSON位于下方，表示一旦所有内容都启动并运行，将从消息的最终源发送的JSON字符串 .

{"sender":"Joe", "id":1, "event":"started", "ticks":2, "time":"20150623T214256Z", "version":"1.0"}

当我通过从Lambda“测试”控制台发布它来测试它时，这非常有效 .

我现在尝试通过将Lambda函数订阅到主题来挂钩SNS，我正在从SNS控制台测试它 . 我尝试使用“原始数据”（没有显示任何结果）和使用“JSON生成器”数据选项生成的JSON发送与上面相同的确切消息，我遇到了SNS似乎的问题将消息发送到Lambda函数，POJO被实例化，但是调用默认构造函数或者使用所有空值调用参数化构造函数 . 无论哪种方式，当Lambda函数通过在POJO中调用重写的toString（）方法来记录消息时，它会为所有变量打印出null，而不会显示任何错误消息 . 同样，SNS主题配置为记录到Cloudwatch，它也没有报告任何错误 . 它获得HTTP状态202 .

这是新生成的JSON消息 .

{
"default": "{\"sender\":\"Joe\", \"id\":1, \"event\":\"started\", \"ticks\":2, \"time\":\"20150623T214256Z\", \"version\":\"1.0\"}", 
"lambda": "{\"sender\":\"Joe\", \"id\":1, \"event\":\"started\", \"ticks\":2, \"time\":\"20150623T214256Z\", \"version\":\"1.0\"}", 
}

以下是日志消息 .

Lambda的日志：

START RequestId: 238a0546-627d-11e5-b228-817bf2a1219a    
Received the following :: We have the following Message{sender=null, id=null, event=null, ticks=null, time=null, version=null}    
END RequestId: 238a0546-627d-11e5-b228-817bf2a1219a   
REPORT RequestId: 238a0546-627d-11e5-b228-817bf2a1219a  Duration: 26.23 ms  Billed Duration: 100 ms     Memory Size: 1536 MB    Max Memory Used: 69 MB

SNS日志：

{ "status": "SUCCESS", "notification": { "timestamp": "2015-09-24 05:28:51.079", "topicArn": "arn:aws:sns:us-east-1:256842276575:App", "messageId": "3f5c0fa1-8a50-5ce3-b7c9-41dc060212c8", "messageMD5Sum": "65a5cb6d53616bd385f72177fe98ecc2" }, "delivery": { "statusCode": 202, "dwellTimeMs": 92, "attempts": 1, "providerResponse": "{\"lambdaRequestId\":\"238a0546-627d-11e5-b228-817bf2a1219a\"}", "destination": "arn:aws:lambda:us-east-1:256842276575:function:App-Lambda-Trigger" } }

以下是适用的Lambda函数代码：

package com.mycompany;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;

public class LambdaHandler {

    public void Handler(Message msg, Context context) {
        LambdaLogger logger = context.getLogger();
        logger.log("Received the following :: " + msg.toString());
    }
}

.

public class Message {
    private String sender;
    private Integer id;
    private String event;
    private Integer ticks;
    private String time;
    private Double version;

public Message(String sender, Integer id, String event, Integer ticks, String time, Double version) {
    this.sender = sender;
    this.id = id;
    this.event = event;
    this.ticks = ticks;
    this.time = time;
    this.version = version;
}

... getters/setters ...

public Message() {
}   

@Override
public String toString() {
    return "We have the following Message{" + "sender=" + getSender() + ", id=" + id + ", event=" + event + ", ticks=" + ticks + ", time=" + time + ", version=" + version + '}';
}

在做了一些挖掘并查看一些javascript示例之后（我可以在AWS'Github存储库中找到一个Java类SNSEvent（https://github.com/aws/aws-lambda-java-libs/blob/master/aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events/SNSEvent.java），然而它认为这是不常见的）并且我找不到任何指定什么对象的东西类型由SNS主题发送到Lambda函数，如果事实上我不应该期望POJO类型 .

有人可以澄清一下，我的Lambda函数应该接收哪种对象类型？有人可以提供一些示例代码吗？

任何帮助，将不胜感激 .

EDIT 1

我修改了我的函数以接受SNSEvent和Context对象，根据建议，我的函数抛出以下异常：

Error loading method handler on class com.app.LambdaHandler: class java.lang.NoClassDefFoundError java.lang.NoClassDefFoundError: com/amazonaws/services/lambda/runtime/events/SNSEvent 
at java.lang.Class.getDeclaredMethods0(Native Method) 
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) 
at java.lang.Class.privateGetPublicMethods(Class.java:2902) 
at java.lang.Class.getMethods(Class.java:1615) Caused by: java.lang.ClassNotFoundException: com.amazonaws.services.lambda.runtime.events.SNSEvent 
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

好像运行时环境无法识别SNSEvent？