即使存在IAM~java sdk，配置文件也不能为空错误AWS

我在ec2实例上有一个角色，该角色对另一个角色具有“假定角色”权限。我已设置了信任关系，因此不应成为问题。我有以下代码来获取IAM凭据：

public class AwsCredentialsHelper {
    private static final String ROLE_ARN_PROPERTY = "aws.role.arn";

    private static final Logger logger = LogManager.getLogger("InfraLogger");

    private AwsCredentialsHelper() {
    }

    public static AWSCredentialsProvider getCredentialsProvider(String clientId, AWSCredentialsProvider defaultProvider) {
        String roleArn = getRoleArnProperty();

        if (roleArn != null) {
            if (logger.isDebugEnabled()) {
                logger.debug("Using assume role credentials provider for role {}", roleArn);
            }
            return new STSAssumeRoleSessionCredentialsProvider.Builder(roleArn, clientId).build();
        } else {
            if (logger.isDebugEnabled()) {
                logger.debug("Using default credentials provider");
            }
            return defaultProvider;
        }
    }

这对我来说是失败的：

18:59:47.516 [kpl-daemon-0000] DEBUG com.amazonaws.auth.AWSCredentialsProviderChain - Unable to load credentials from EnvironmentVariableCredentialsProvider: Unable to load AWS credentials from environment variables (AWS_ACCESS_KEY_ID (or AWS_ACCESS_KEY) and AWS_SECRET_KEY (or AWS_SECRET_ACCESS_KEY))
18:59:47.516 [kpl-daemon-0000] DEBUG com.amazonaws.auth.AWSCredentialsProviderChain - Unable to load credentials from SystemPropertiesCredentialsProvider: Unable to load AWS credentials from Java system properties (aws.accessKeyId and aws.secretKey)
18:59:47.516 [main] DEBUG org.springframework.jmx.export.annotation.AnnotationMBeanExporter - Unregistering JMX-exposed beans
18:59:47.523 [kpl-daemon-0000] DEBUG com.amazonaws.auth.AWSCredentialsProviderChain - Unable to load credentials from com.amazonaws.auth.profile.ProfileCredentialsProvider@c745363: profile file cannot be null

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它看起来是在看前三个地方，但从来没有经过下一个地方（包括iam角色）。我们显然没有凭据文件设置。相同的代码在不同的设置中对我起作用，因此我不知道我是否正确执行了此操作？

您在哪里运行此代码？在已分配角色的ec2实例上，或在其他计算机上？在已分配角色的ec2上。