java - AWS Lambda ClassNotFoundException

问题描述

在 dynamoDB 更新时调用 lambda 函数时遇到问题。我检查了 AWS Lambda: ClassNotFoundException 和 AWS Lambda NoClassDefFoundError 但没有成功。

我正在编写这个 lambda 函数，以便在 dynamo 有任何更新时调用。我按照本教程进行操作。 https://docs.aws.amazon.com/lambda/latest/dg/with-dynamodb-create-package.html

所有事情都已成功完成，但问题是当我更新 dynamodb 并检查 AWS Cloud watch 的日志时出现异常。

Error loading method handleRequest on class com.amazonaws.lambda.demo.LambdaFunctionHandler: java.lang.NoClassDefFoundError
java.lang.NoClassDefFoundError: com/amazonaws/services/lambda/runtime/events/DynamodbEvent
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.DynamodbEvent
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 4 more

我的java代码是。

package com.amazonaws.lambda.demo;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.DynamodbEvent;
import com.amazonaws.services.lambda.runtime.events.DynamodbEvent.DynamodbStreamRecord;


public class LambdaFunctionHandler implements RequestHandler<DynamodbEvent, String> {

    @Override
    public String handleRequest(DynamodbEvent ddbEvent, Context context) {
        // TODO Auto-generated method stub
        for (DynamodbStreamRecord record : ddbEvent.getRecords()){
               System.out.println(record.getEventID());
               System.out.println(record.getEventName());
               System.out.println(record.getDynamodb().toString());

            }
            return "Successfully processed " + ddbEvent.getRecords().size() + " records.";
    }

}

我的 pom.xml 是

<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.amazonaws.lambda</groupId>
  <artifactId>demo</artifactId>
  <version>1.0.0</version>
  <packaging>jar</packaging>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
          <forceJavacCompilerUse>true</forceJavacCompilerUse>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>3.0.0</version>
        <configuration>
      <createDependencyReducedPom>false</createDependencyReducedPom>
    </configuration>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.amazonaws</groupId>
        <artifactId>aws-java-sdk-bom</artifactId>
        <version>1.11.321</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-lambda-java-events</artifactId>
      <version>1.3.0</version>
    </dependency>
    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-lambda-java-core</artifactId>
      <version>1.1.0</version>
    </dependency>
  </dependencies>
</project>

我将我的处理程序命名为com.amazonaws.lambda.demo.LambdaFunctionHandler::handleRequest

我检查了所有的东西都很好，但它仍然给我com.amazonaws.services.lambda.runtime.events.DynamodbEvent这个类的错误是在 aws sdk 中。

依赖树。

标签： javaamazon-web-servicesaws-lambdaaws-sdk

您必须使用以下命令通过 Maven 构建您的项目mvn clean package：然后转到target可以找到构建的 jar 文件的目录。

当您将 jar 文件上传到 AWS Lambda 时，您必须上传包含所有依赖项的 jar 文件（aws-lambda-java-events在您的示例中）。请查看您的示例屏幕：

在您的情况下，您必须上传demo-1.0.0.jar而不是original-demo-1.0.0.jar.

java - AWS Lambda ClassNotFoundException

问题描述

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