Combining @SqsListener and @RequestMapping

Question

We're currently in the middle of migrating our current architecture into Spring-AWS-based microservices. One of my tasks is to research on how our microservices communicate with one another. I'm aiming to set-up a hybrid system of RESTful HTTP endpoints and SQS producers and consumers.

As an example, I have the below code:

@SqsListener("request_queue")
@SendTo("response_queue")
@PostMapping("/send")
public Object send(@RequestBody Request request, @Header("SenderId") String senderId) {
    if (senderId != null && !senderId.trim().isEmpty()) {
        logger.info("SQS Message Received!");
        logger.info("Sender ID: ".concat(senderId));
        request = new Gson().fromJson(payload, Request.class);
    }

    Response response = processRequest(request); // Process request

    return response;
}

Theoretically, this method should be able to handle the following:

1. Receive a Request object via HTTP
2. Continually poll the request_queue for a message containing the Request object

As an HTTP endpoint, the method returns no error. However, as an SQS listener, it runs into the following exception:

org.springframework.messaging.converter.MessageConversionException: 
    Cannot convert from [java.lang.String] to [com.oriente.salt.Request] for 
    GenericMessage [payload={"source":"QueueTester","message":"This is a wonderful 
    message send by queue from Habanero to Salt. Spicy.","msisdn":"+639772108550"}, 
    headers={LogicalResourceId=salt_queue, ApproximateReceiveCount=1, 
    SentTimestamp=1523444620218, ....

I've tried to annotate the Request param with @Payload, but to no avail. Currently I've also set-up the AWS config via Java, as seen below:

ConsuerAWSSQSConfig.java

@Configuration
public class ConsumerAWSSQSConfig {

@Bean
public SimpleMessageListenerContainer simpleMessageListenerContainer() {
    SimpleMessageListenerContainer msgListenerContainer = simpleMessageListenerContainerFactory()
            .createSimpleMessageListenerContainer();
    msgListenerContainer.setMessageHandler(queueMessageHandler());
    return msgListenerContainer;
}

@Bean
public SimpleMessageListenerContainerFactory simpleMessageListenerContainerFactory() {
    SimpleMessageListenerContainerFactory msgListenerContainerFactory = new SimpleMessageListenerContainerFactory();
    msgListenerContainerFactory.setAmazonSqs(amazonSQSClient());
    return msgListenerContainerFactory;
}

@Bean
public QueueMessageHandler queueMessageHandler() {
    QueueMessageHandlerFactory queueMsgHandlerFactory = new QueueMessageHandlerFactory();
    queueMsgHandlerFactory.setAmazonSqs(amazonSQSClient());
    QueueMessageHandler queueMessageHandler = queueMsgHandlerFactory.createQueueMessageHandler();
    List<HandlerMethodArgumentResolver> list = new ArrayList<>();
    HandlerMethodArgumentResolver resolver = new PayloadArgumentResolver(new MappingJackson2MessageConverter());
    list.add(resolver);
    queueMessageHandler.setArgumentResolvers(list);
    return queueMessageHandler;
}

@Lazy
@Bean(name = "amazonSQS", destroyMethod = "shutdown")
public AmazonSQSAsync amazonSQSClient() {
    AmazonSQSAsync awsSQSAsync = AmazonSQSAsyncClientBuilder.standard().withRegion(Regions.AP_SOUTHEAST_1).build();
    return awsSQSAsync;
}
}

What do you guys think?