我想使用一个示例配置文件连接到rds aurora示例，该示例配置文件利用sts来承担角色，这样我就不需要在解决方案中硬编码我的密码。我收到一个错误，说明我的用户没有访问权限。但是，当我用用户名和密码硬编码连接字符串时，我可以使用相同的用户进行连接。我已经检查了db用户权限，它们是正确的。我还尝试使用角色中的所有权限。我添加了日志记录来检查我是否收到了令牌。任何想法或帮助都将不胜感激。我一直关注的亚马逊文档是：https://docs.aws.amazon.com/amazonrds/latest/userguide/usingwithrds.iamdbauth.connecting.java.html
我的代码：

public final class Database {

private static String jdbcUrl = "jdbc:mysql://" + DockerConstants.PersistenceStoreUrl + ":" + DockerConstants.PersistenceStorePort + "/dbname";

private Database() {
}

public static Connection getConnection() throws SQLException {
    return DriverManager.getConnection(jdbcUrl, setMySqlConnectionProperties());
}

static String generateAuthToken(){

    RdsIamAuthTokenGenerator generator = RdsIamAuthTokenGenerator.builder()
        .credentials(InstanceProfileCredentialsProvider.getInstance())
        .region(EC2MetadataUtils.getEC2InstanceRegion())
        .build();

    String authToken = generator.getAuthToken(
            GetIamAuthTokenRequest.builder()
            .hostname(DockerConstants.PersistenceStoreUrl)
            .port(DockerConstants.PersistenceStorePort)
            .userName(DockerConstants.PersistenceStoreUserName)
            .build());
    return authToken;
}

private static Properties setMySqlConnectionProperties() {
    Properties mysqlConnectionProperties = new Properties();
    mysqlConnectionProperties.setProperty("verifyServerCertificate","false");
    mysqlConnectionProperties.setProperty("useSSL", "false");
    mysqlConnectionProperties.setProperty("user", DockerConstants.PersistenceStoreUserName);
    mysqlConnectionProperties.setProperty("password",generateAuthToken());

    return mysqlConnectionProperties;
}

}