java - NoClassDefFound错误: AmazonSNSClient in Java SDK

Question

当我尝试实例化 AWSSNSClient 时，出现错误“未找到类定义”。此代码未在 AWS Lambda 的本地系统中运行。 这是我的 Java 代码

   18->   AmazonSNSClient snsClient = new AmazonSNSClient(credentials);
        snsClient.setRegion(Region.getRegion(Regions.));
        ObjectMapper Obj = new ObjectMapper();
        PublishRequest publishRequest = new PublishRequest();
        publishRequest.setTargetArn("");
        publishRequest.setMessage("");
        PublishResult publishResponse = snsClient.publish(publishRequest);

我的pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.cmds</groupId>
    <artifactId></artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name></name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.amazonaws</groupId>
                <artifactId>aws-java-sdk-bom</artifactId>
                <version>1.11.379</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-kubernetes-config</artifactId>
            <version>1.1.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-flow</artifactId>
            <version>1.0.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jms</artifactId>
            <version>5.2.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>amazon-sqs-java-messaging-lib</artifactId>
            <version>1.0.8</version>
        </dependency>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-sns</artifactId>
            <version>1.11.721</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

        </plugins>

    </build>

</project>

当java代码执行时，我收到以下错误

java.lang.NoClassDefFoundError:com/amazonaws/services/sns/AmazonSNSClient 在 com.cmds.booking.infrastruct.SNSService.publishMessage(SNSService.java:18)

有任何依赖性问题吗？我哪里出错了？

Answer 1

我已尽我所能检查了您的 Java 代码片段，并且注意到了两个问题:

( i ) 下面的行不完整:

snsClient.setRegion(Region.getRegion(Regions.));

并且应该更改为:

snsClient.setRegion(Region.getRegion(Regions.US_EAST_1)); //US_EAST_1 can be replaced with your desired region

( ii ) 以下声明已弃用:

new AmazonSNSClient(credentials) 

和

snsClient.setRegion(Region.getRegion(Regions.fromName(region)));

相反，AWS 服务客户端应按如下方式创建:

如果您使用凭证文件，则可以使用以下内容:

BasicAWSCredentials basicAwsCredentials = new BasicAWSCredentials(AccessKey,SecretAccessKey);
AmazonSNS snsClient = AmazonSNSClient
                    .builder()
                    .withRegion(your_region)
                    .withCredentials(new AWSStaticCredentialsProvider(basicAwsCredentials))
                    .build();

如果您要使用 InstanceProfileCredentialProvider 那么您可以使用以下内容:

AmazonSNS sns = AmazonSNSClientBuilder
                .standard()
                .withCredentials(new InstanceProfileCredentialsProvider(true))
                .build();

更多信息可以在 AWS Java developer guide 上找到

希望这有帮助!