无法从Lambda函数插入DynamoDB表

问题描述

运行lambda函数时出现以下错误，该函数应该将一个项放入DynamoDB表中。

      "errorMessage": "com/amazonaws/services/dynamodbv2/AmazonDynamoDBClientBuilder","errorType": "java.lang.NoClassDefFoundError","stackTrace": [
        "dao.EventDAO.insertEvent(EventDAO.java:15)","service.PostEventService.postEvent(PostEventService.java:12)","handler.PostEventHandler.handle(PostEventHandler.java:11)","java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)","java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(UnkNown Source)","java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(UnkNown Source)","java.base/java.lang.reflect.Method.invoke(UnkNown Source)"
      ]

这是我要插入表中的代码：

    package dao;
    
    import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
    import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
    import com.amazonaws.services.dynamodbv2.document.DynamoDB;
    import com.amazonaws.services.dynamodbv2.document.Item;
    import com.amazonaws.services.dynamodbv2.document.PutItemOutcome;
    import com.amazonaws.services.dynamodbv2.document.Table;
    import request.PostEventRequest;
    import response.PostEventResponse;
    
    public class EventDAO {
    
        public PostEventResponse insertEvent(PostEventRequest request) {
            AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build();
            DynamoDB dynamoDB = new DynamoDB(client);
            Table table = dynamoDB.getTable("Event");
            PostEventResponse response = new PostEventResponse();
    
            // Build the item
            Item item = new Item()
                    .withPrimaryKey("eventId",request.eventId)
                    .withString("username",request.username)
                    .withString("image",request.image)
                    .withString("description",request.description)
                    .withString("time",request.time);
    
            // Write the item to the table
            PutItemOutcome outcome = table.putItem(item);
    
            return response;
        }
    }

这是我的pom.xml，因为我怀疑这可能很重要：

    <?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>
    
        <dependencies>
            <dependency>
                <groupId>com.amazonaws</groupId>
                <artifactId>aws-java-sdk</artifactId>
                <version>1.11.327</version>
            </dependency>
            <dependency>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
            </dependency>
        </dependencies>
    
        <properties>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
        </properties>
    
        <groupId>earnshawsfinest</groupId>
        <artifactId>rally-backend</artifactId>
        <version>1.0-SNAPSHOT</version>
    </project>

由于某种原因，当它在lambda中时，它无法识别AmazonDynamoDbClientBuilder类，即使在我的IntelliJ项目中它也很重要。我的IntelliJ项目的构建没有问题，并且将我上传到lambda的jar（包含模块和依赖项）导出。如果我取出DynamoDB的东西，则lambda可以正常工作。

我觉得我可能缺少某些地方的下载或导入，但我不知道该怎么办。我已经按照亚马逊的各种教程进行了学习，甚至我以前都做过，但是我没有遇到这个问题。有什么帮助吗？预先感谢！

解决方法

默认情况下，依赖项不捆绑在jar文件中。您需要这样做或在单独的lambda层中提供它们

检查链接Building a deployment package with Maven并查看使用maven-shade-plugin，该链接应在目标jar文件中构建所有依赖项。

  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>3.2.2</version>
    <configuration>
      <createDependencyReducedPom>false</createDependencyReducedPom>
    </configuration>
    <executions>
      <execution>
        <phase>package</phase>
        <goals>
          <goal>shade</goal>
        </goals>
      </execution>
    </executions>
  </plugin>