AWS Lambda 使用 Java 与 AWS RDS 集成，但在加载类软件/amazon/awssdk/auth/credentials/AwsCredentialsProvider 时遇到错误

Posted 2023-03-28

【中文标题】AWS Lambda 使用 Java 与 AWS RDS 集成，但在加载类软件/amazon/awssdk/auth/credentials/AwsCredentialsProvider 时遇到错误

【英文标题】：AWS Lambda integrate with AWS RDS using Java but facing Error loading class software/amazon/awssdk/auth/credentials/AwsCredentialsProvider

【发布时间】：2021-12-27 05:51:06

【问题描述】：

这是我使用 java 在 aws lambda 中上传的代码。 我使用 mvn clean package 制作了一个 jar 并上传到 lambda 函数服务，但出现错误 java.lang.NoClassDefFoundError: software/amazon/awssdk/auth/credentials/AwsCredentialsProvider

请帮帮我。

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyRequestEvent;
import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;
import software.amazon.awssdk.auth.credentials.EnvironmentVariableCredentialsProvider;
import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.rdsdata.RdsDataClient;
import software.amazon.awssdk.services.rdsdata.model.ExecuteStatementRequest;
import software.amazon.awssdk.services.rdsdata.model.ExecuteStatementResponse;

import java.util.Collections;

public class LambdaJavaAPI implements RequestHandler<APIGatewayProxyRequestEvent, Object> 

    public static final String AURORA_CLUSTER_ARN_ENV = "cluster key";
    public static final String DATABASE_NAME_ENV = "mylab";
    public static final String AURORA_SECRET_ARN_ENV = "security manager key";

    /**
     * @return an instance of RdsClient
     */
    public static RdsDataClient rdsClient() 
        Region region = Region.US_EAST_1;
        return RdsDataClient.builder()
                .credentialsProvider(EnvironmentVariableCredentialsProvider.create())
                .region(region)
                .httpClientBuilder(UrlConnectionHttpClient.builder()).build();
    

    @Override
    public APIGatewayProxyResponseEvent handleRequest(APIGatewayProxyRequestEvent input, Context context) 
        String responseBody = "Test Event";
        final RdsDataClient rdsDataClient = new LambdaJavaAPI().rdsClient();

        ExecuteStatementRequest request = ExecuteStatementRequest.builder()
                .database(DATABASE_NAME_ENV)
                .resourceArn(AURORA_CLUSTER_ARN_ENV)
                .secretArn(AURORA_SECRET_ARN_ENV)
                .sql(String.format("select name from users",DATABASE_NAME_ENV))
                .build();
        ExecuteStatementResponse executeStatementResponse = rdsDataClient.executeStatement(request);
        if (executeStatementResponse.hasRecords()) 

        

        return new APIGatewayProxyResponseEvent().withStatusCode(200)
                .withIsBase64Encoded(Boolean.FALSE)
                .withHeaders(Collections.emptyMap())
                .withBody(responseBody);
    

【参考方案1】：

AwsCredentialsProvider 存在于https://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk/1.12.110

如果你不使用 Maven 和 Dependencies，则下载 jar https://repo1.maven.org/maven2/com/amazonaws/aws-java-sdk/1.12.110/aws-java-sdk-1.12.110.jar

您需要将其包含在您打包的 jar 的库中，或者必须将其添加到您的类路径中，例如 java -cp

获取生成的 jar，重命名为 .zip 并解压缩，然后查看内容。里面有这个罐子吗？

【讨论】：

@***.com/users/7064617/sma - 我已经在 pom.xml 中添加了依赖项。

请打开你的罐子看看里面的内容

【参考方案2】：

我用 mvn clean package 做了一个 jar

这只是打包你的类；它不包括依赖项。

相反，使用 Maven shade 插件创建一个“uberjar”。这在 AWS 文档中有所描述：https://docs.aws.amazon.com/lambda/latest/dg/java-package.html