Spring WS with using SAAJ - No adapter for endpoint error

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I am really struggling getting Spring-WS to return a response with attachments. I have managed to get an MTOM version to work but this has some pre-requisites on the client as i believe that the client has to be MTOM enabled as well (please correct me if this is not correct).

What i am trying to do now is to use the standard SOAP with attachment implementation using SAAJ and Spring-WS.

To do this i implemented an endpoint that just attaches an image from the local filesystem to the response.

    @Endpoint
    public class TestEndPoint {
    
    private SaajSoapMessageFactory saajMessageFactory;
    
    @PayloadRoot(namespace="http://ws.mypackage.com", localPart="downloadMessageRequestSaaj")
    	@ResponsePayload
    	public JAXBElement<DownloadResponseSaajType> invoke(@RequestPayload DownloadMessageRequestSaaj req, MessageContext context ) throws Exception  {
    		
    		DownloadResponseSaajType response = new DownloadResponseSaajType();
    		DownloadResponseSaajType.PayLoad payload = new DownloadResponseSaajType.PayLoad();	
    		
    		DataHandler handler = new javax.activation.DataHandler(new FileDataSource("c:\\temp\\maven-feather.png"));
    
    	        SaajSoapMessage message = saajMessageFactory.createWebServiceMessage();
    	        message.addAttachment("picture", handler);
    
    	        context.setResponse(message);
    	        
    	        payload.setMessagePayLoad(handler);
    	        
    	        return objectFactory.createDownloadMessageResponseSaaj(response);  
    
    	}
    	
    	public void setSaajMessageFactory(SaajSoapMessageFactory saajMessageFactory){
            this.saajMessageFactory = saajMessageFactory;
        }
    
        public SaajSoapMessageFactory getSaajMessageFactory(){
            return saajMessageFactory;
        }
    }

The Saaj properties are depency injected as shown below:

<context:annotation-config/>  	
  	<context:component-scan base-package="com.mypackage"/>
  	
    <sws:annotation-driven/>
    
    <bean id="soapMessageFactory" class="javax.xml.soap.MessageFactory" factory-method="newInstance" />
	<bean id="saajMessageFactory" class="org.springframework.ws.soap.saaj.SaajSoapMessageFactory">
		    <constructor-arg ref="soapMessageFactory" />
	</bean>
		
	<bean id="myService" class="com.mypackage.TestEndPoint">
	    <property name="saajMessageFactory" ref="saajMessageFactory" />
	</bean>

When i try to call the above service i get the following error:

    <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
       <SOAP-ENV:Header/>
       <SOAP-ENV:Body>
          <SOAP-ENV:Fault>
             <faultcode>SOAP-ENV:Server</faultcode>
             <faultstring xml:lang="en">No adapter for endpoint [public javax.xml.bind.JAXBElement&lt;com.mypackage.ws.DownloadResponseSaajType> com.mypackage.TestEndPoint.invoke(com.mypackage.ws.DownloadMessageRequestSaaj,org.springframework.ws.context.MessageContext) throws java.lang.Exception]: Is your endpoint annotated with @Endpoint, or does it implement a supported interface like MessageHandler or PayloadEndpoint?</faultstring>
          </SOAP-ENV:Fault>
       </SOAP-ENV:Body>
    </SOAP-ENV:Envelope>

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I noticed today that i change the method signature to remove the MessageContext parameters as shown below then i dont get that error:

public JAXBElement<DownloadResponseSaajType> invoke(@RequestPayload DownloadMessageRequestSaaj req)

The problem however is that i need to access the MessageContext to be able to add the attachment. Could be that maybe my configuration is wrong somewhere?