public void setArn(String arn) {
        this.arn = arn;
    }
<p>
The Amazon Resource Name (ARN) of the source account, Identity and Access Management (IAM) user, or role that was
used to get the credentials.
</p>

@param arn
       The Amazon Resource Name (ARN) of the source account, Identity and Access Management (IAM) user, or role
       that was used to get the credentials.
aws-java-sdk-macie2/src/main/java/com/amazonaws/services/macie2/model/SessionIssuer.java