public void setPrincipalArn(String principalArn) {
        this.principalArn = principalArn;
    }
<p>
The Amazon Resource Name (ARN) of the role, if it is activated.
</p>

@param principalArn
       The Amazon Resource Name (ARN) of the role, if it is activated.
aws-java-sdk-lightsail/src/main/java/com/amazonaws/services/lightsail/model/ContainerServiceECRImagePullerRole.java