AWS LAMBDA的NoClassDefFoundError [英] AWS Lambda NoClassDefFoundError
问题描述
我有困难了基于Java的lambda函数设置从SNS接收消息。我的功能看起来如下：
包com.mycompany;
进口com.amazonaws.services.lambda.runtime.Context;
进口com.amazonaws.services.lambda.runtime.LambdaLogger;
进口com.amazonaws.services.lambda.runtime.events.SNSEvent;
公共类LambdaHandler {
公共无效处理程序（SNSEvent事件，上下文语境）{
//处理事件
}
}
它编译就好了，我没有任何问题（通过Web控制台）上传的jar文件LAMBDA。
然而，当我（经由SNS的订阅lambda函数）发布到其与JSON重新presenting的SNSEvent模型，lambda函数抛出以下异常：
在阶级com.mycompany.LambdaHandler加载错误方法处理： 类java.lang.NoClassDefFoundError的java.lang.NoClassDefFoundError的： COM / amazonaws /服务/λ/运行/事件/ SNSEvent在
java.lang.Class.getDeclaredMethods0（本机方法）在 java.lang.Class.privateGetDeclaredMethods（Class.java:2701）在 java.lang.Class.privateGetPublicMethods（Class.java:2902）在 java.lang.Class.getMethods（Class.java:1615）所引起的： 抛出java.lang.ClassNotFoundException： com.amazonaws.services.lambda.runtime.events.SNSEvent在 java.net.URLClassLoader.findClass（URLClassLoader.java:381）在 java.lang.ClassLoader.loadClass（ClassLoader.java:424）在 java.lang.ClassLoader.loadClass（ClassLoader.java:357）
我使用Maven + Netbeans的，它是一个Maven的Java应用程序项目。我从网上下载LAMBDA控制台的功能和确认后，罐子有一个lib /目录中的所有jar的为进口，包括AWS-λ-java的事件 - 1.1.0.jar，它本身包括/ COM / amazonaws /services/lambda/runtime/events/SNSEvent.class文件。
为什么是运行时无法找到类时，它绝对是jar文件？还有什么我需要做的，设置任何环境变量，等等？
任何帮助将是AP preciated！
修改1 我试图降级到AWS-λ-java的事件1.0.0，它仍然报告相同的异常。按照要求，下面是我的POM文件（只有项目名称更改）。我不知道如何告诉Maven来把库中的树结构。
＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT;项目的xmlns =http://maven.apache.org/POM/4.0.0的xmlns：XSI =http://www.w3.org/2001/XMLSchema-instanceXSI：的schemaLocation =HTTP： //maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
＆LT; modelVersion＆GT; 4.0.0＆LT; / modelVersion＆GT;
＆LT;的groupId＆GT; com.app＆LT; /的groupId＆GT;
＆LT; artifactId的＆GT;处理程序和LT; / artifactId的＆GT;
＆LT;版＆GT; 1.0-SNAPSHOT＆LT; /版本＆GT;
＆LT;包装＆GT;罐子＆LT; /包装＆GT;
＆LT;依赖＆GT;
＆LT;依赖＆GT;
＆LT;的groupId＆GT; com.amazonaws＆LT; /的groupId＆GT;
＆LT; artifactId的＆GT; AWS-java的SDK-拉姆达＆LT; / artifactId的＆GT;
＆LT;版＆GT; 1.10.6＆LT; /版本＆GT;
＆LT; /依赖性＆GT;
＆LT;依赖＆GT;
＆LT;的groupId＆GT; com.amazonaws＆LT; /的groupId＆GT;
＆LT; artifactId的＆GT; AWS-λ-Java的核心和LT; / artifactId的＆GT;
＆LT;版＆GT; 1.0.0＆LT; /版本＆GT;
＆LT; /依赖性＆GT;
＆LT;依赖＆GT;
＆LT;的groupId＆GT; com.amazonaws＆LT; /的groupId＆GT;
＆LT; artifactId的＆GT; AWS-λ-java的事件＆LT; / artifactId的＆GT;
＆LT;版＆GT; 1.0.0＆LT; /版本＆GT;
＆LT; /依赖性＆GT;
＆LT; /依赖性＆GT;
＆LT;性状＆gt;
＆LT; project.build.sourceEncoding＆GT; UTF-8＆LT; /project.build.sourceEncoding>
＆LT; maven.compiler.source＆GT; 1.8＆LT; /maven.compiler.source>
＆LT; maven.compiler.target＆GT; 1.8＆LT; /maven.compiler.target>
＆LT; /性状＆gt;
＆LT; /项目＆GT;
使用行家-shade插件这样的JAR包含在尤伯杯罐子的依赖关系。
因此，添加到您的pom.xml
＆LT;建立＆GT;
＆LT;插件＆GT;
＆LT;插件＆GT;
＆LT;的groupId＆GT; org.apache.maven.plugins＆LT; /的groupId＆GT;
＆LT; artifactId的＆GT;的maven-遮阳插件＆LT; / artifactId的＆GT;
＆LT;版＆GT; 2.3＆LT; /版本＆GT;
＆lt;结构＆GT;
＆LT; createDependencyReducedPom＆GT;假＆LT; / createDependencyReducedPom＆GT;
＆LT; /结构＆gt;
＆LT;执行＆GT;
＆LT;执行＆GT;
＆LT;阶段＆gt;包＆LT; /阶段＆gt;
＆LT;目标＆GT;
＆LT;目标＆GT;遮阳＆LT; /目标＆GT;
＆LT; /目标＆GT;
＆LT; /执行＆GT;
＆LT; /执行＆GT;
＆LT; /插件＆GT;
＆LT; /插件＆GT;
来源：的http://docs.aws.amazon.com/lambda/latest/dg/java-create-jar-pkg-maven-no-ide.html
潜在可能有这个问题 https://github.com/ AWS / AWS-λ-java的库/问题/ 2 这需要一个降级到AWS-λ-java的事件-1.0.0.jar
I am having difficulty with a Java based Lambda function setup to receive messages from SNS. My function looks like the below:
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
}
}
It compiles just fine and I don't have any problems uploading the jar file to Lambda (via the web console).
However, when I publish to it (via SNS through to the subscribed Lambda function) with JSON representing the SNSEvent model, the Lambda function throws the following exception:
Error loading method handler on class com.mycompany.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)
I use Maven + Netbeans and it's a Maven Java Application project. I downloaded the function from the Lambda console and confirmed, the jar has a lib/ directory with all of the jar's for the imports, including aws-lambda-java-events-1.1.0.jar, which itself includes the /com/amazonaws/services/lambda/runtime/events/SNSEvent.class file.
Why is the runtime unable to find the class when it's definitely in the jar file? Is there anything else I need to do, set any environment variables, etc?
Any help would be appreciated!
EDIT 1 I tried downgrading to aws-lambda-java-events 1.0.0 and it's still reporting the same exception. As requested, below is my POM file (with just project name changed). I don't know how to tell Maven to put the libraries in a tree structure.
<?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>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
</project>
Use the maven-shade plugin so that the JAR contains the dependencies in an uber-jar.
So, add this to your pom.xml
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.3</version>
<configuration>
<createDependencyReducedPom>false</createDependencyReducedPom>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
Source: http://docs.aws.amazon.com/lambda/latest/dg/java-create-jar-pkg-maven-no-ide.html
Potentially you may have this issue https://github.com/aws/aws-lambda-java-libs/issues/2 which requires a downgrade to aws-lambda-java-events-1.0.0.jar
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