相关疑难解决方法(0)

我很难使用基于Java的Lambda函数设置来接收来自SNS的消息.我的功能如下所示:

package com.mycompany;

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

public class LambdaHandler {  
    public void Handler(SNSEvent event, Context context) {
        //Process the event
    }
}

它编译得很好,我没有任何问题上传jar文件到Lambda(通过Web控制台).

但是,当我使用表示SNSEvent模型的JSON发布它(通过SNS到订阅的Lambda函数)时,Lambda函数抛出以下异常:

在类com.mycompany.LambdaHandler上加载方法处理程序时出错:class java.lang.NoClassDefFoundError java.lang.NoClassDefFoundError:com/amazonaws/services/lambda/runtime/events/SNSEvent at

爪哇java.lang.Class.Class.AvlaredMethods(Class.java:2701)的java.lang.Class.getDeclaredMethods0(本地方法)java.lang.Class.TM中的java.lang.Class.privateGetPublicMethods(Class.java:2902) Class.java:1615)引起:java.lang.ClassNotFoundException:com.amazonaws.services.lambda.runtime.events.SNSEvent at java.net.URLClassLoader.findClass(URLClassLoader.java:381)at java.lang.ClassLoader. java.lang.ClassLoader.loadClass(ClassLoader.java:357)中的loadClass(ClassLoader.java:424)

我使用Maven + Netbeans,它是一个Maven Java Application项目.我从Lambda控制台下载了该函数并确认,该jar有一个lib /目录,其中包含所有用于导入的jar,包括aws-lambda-java-events-1.1.0.jar,它本身包含/ com/amazonaws /services/lambda/runtime/events/SNSEvent.class文件.

为什么运行时无法在jar文件中找到类？还有什么我需要做的,设置任何环境变量等吗？

任何帮助,将不胜感激!

编辑1 我尝试降级到aws-lambda-java-events 1.0.0并且它仍然报告相同的异常.根据要求,下面是我的POM文件(只更改了项目名称).我不知道如何告诉Maven将库放在树形结构中.

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.app</groupId>
    <artifactId>Handler</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-lambda</artifactId>
            <version>1.10.6</version>
        </dependency>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-lambda-java-core</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-lambda-java-events</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies> …

我有几个lambda通过SNS一起工作.一个lambda接收请求并将数据发送到SNS.另一个lambda订阅了SNS.在JavaScript中很容易做,因为传入的消息只是一个JS对象.现在我将lambda重写为Java.我正在寻找在处理程序中使用的类型.

这就是lambda的样子.SNSMessage是该类型的占位符.

public class ArchiveRequestHandler implements RequestHandler<SNSMessage?, Void> {

    @Override public Void handleRequest(SNSMessage? input, Context context) {
        // do something with the message
        return null;
    }
}

这是示例消息的样子:

{
  "Records": [
    {
      "EventVersion": "1.0",
      "EventSubscriptionArn": "arn:aws:sns:EXAMPLE",
      "EventSource": "aws:sns",
      "Sns": {
        "SignatureVersion": "1",
        "Timestamp": "1970-01-01T00:00:00.000Z",
        "Signature": "EXAMPLE",
        "SigningCertUrl": "EXAMPLE",
        "MessageId": "1234567-ee98-5cb9-9903-4c221d41eb5e",
        "Message": "Hello from SNS!",
        "MessageAttributes": {
          "Test": {
            "Type": "String",
            "Value": "TestString"
          },
          "TestBinary": {
            "Type": "Binary",
            "Value": "TestBinary"
          }
        },
        "Type": "Notification",
        "UnsubscribeUrl": "EXAMPLE",
        "TopicArn": "arn:aws:sns:EXAMPLE",
        "Subject": "TestInvoke"
      } …