How to correctly implement SNS receiver in Spring-cloud-aws framework? (i.e. @NotificationMessageMapping)

I am currently using STS 3.6.3SR1 using Spring 4.1.4. Trying to test spring-cloud-aws for feasibility of use within our application.

Jars Related to Question :

spring-cloud-aws-autoconfigure-1.0.0.RC2.jar

spring-cloud-aws-context-1.0.0.RC2.jar

spring-cloud-aws-core-1.0.0.RC2.jar

spring-cloud-aws-messaging-1.0.0.RC2.jar

Using aws-sdk-1.9.3

Currently have this in my xml context file.

<mvc:annotation-driven>
    <mvc:argument-resolvers>
        <ref bean="notificationResolver"/>
    </mvc:argument-resolvers>
</mvc:annotation-driven> 

<aws-messaging:notification-argument-resolver id="notificationResolver" />


<aws-messaging:notification-messaging-template id="notificationMessagingTemplate" default-destination="snsChannelTopic"/> 

Currently have this Controller class defined as my endpoint.

public class AmazonSNSController {
    @Autowired
    HttpServletRequest request;

    @Autowired
    HttpServletResponse response;

    @NotificationSubscriptionMapping
    public void handleSubscriptionMessage(SnsHelper status) throws IOException {
        //We subscribe to start receive the message
        status.setRequest(request);
        status.setResponse(response);
        status.confirmSubscription();
    }

    @NotificationMessageMapping
    public void handleNotificationMessage(@NotificationSubject String subject, @NotificationMessage String message) {
        System.out.println(subject + message);
    }

    @NotificationUnsubscribeConfirmationMapping
    public void handleUnsubscribeMessage(SnsHelper status) {
        //e.g. the client has been unsubscribed and we want to "re-subscribe"
        //status.confirmSubscription();
    }

In the above class SnsHelper implements NotificationStatus and I have confirmed the subscription properly. I am receiving notifications to the handleNotificationMessage method as well. However, both Strings evaluate to null regardless of what I send.

I believe this has to do with the notificationResolver not being registered/applied correctly.

Can anyone provide some guidance on this?

Thank you for your help.