Why MTOM attachments get duplicated inline (JAX-WS RI 2.1)?

Question

Hello, I'm trying to return binary data with MTOM as ant attachment, but actually data is inlined as base64 encoded data and then duplicated as attachment. Why? Here is my web service:

@WebService
@MTOM(threshold=0, enabled=true)
public class BinaryService {
    private static final String SERVICE_ENDPOINT = "http://localhost:8998/test";
    @WebMethod
    public DataHandler  getData()
    {
        try {
            System.out.println("Try to return data....");
            return new DataHandler(new URL("file:///java/apache-ant-1.8.0/docs/images/JDJEditorsChoiceAward.jpg"));
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            throw new RuntimeException(e);
        }
    }

And here is how I instantiate client and call the service:

public static void main(String[] args)
    {
        Endpoint.publish(SERVICE_ENDPOINT, new BinaryService());
        System.setProperty("com.sun.xml.ws.transport.http.HttpAdapter.dump", "true");
        System.setProperty("com.sun.xml.ws.transport.http.client.HttpTransportPipe.dump", "true");

        xxx.BinaryService port = new BinaryService_Service().getBinaryServicePort(new MTOMFeature(true));
        SOAPBinding binding = (SOAPBinding)((BindingProvider)port).getBinding();
        binding.setMTOMEnabled(true);

        Map<String, Object> ctxt = ((BindingProvider)port ).getRequestContext();
        ctxt.put(BindingProvider.ENDPOINT_ADDRESS_PROPERTY, SERVICE_ENDPOINT);

        List handlerList = binding.getHandlerChain(); 
        if (handlerList == null) { 
                System.out.println("HandlerList is null"); 
                   handlerList = new ArrayList(); 
        } 
        System.out.println("Handlers: " + handlerList);
        LoggingHandler loggingHandler = new LoggingHandler(); 
        handlerList.add(loggingHandler); 
        binding.setHandlerChain(handlerList);   

        byte[] data = port.getData();

code of LoggingHandler:

@Override
    public boolean handleMessage(SOAPMessageContext context) {

        Boolean outboundProperty = (Boolean)  context.get (MessageContext.MESSAGE_OUTBOUND_PROPERTY);

    PrintStream out = System.out;
    if (outboundProperty.booleanValue()) {
        out .println("\nOutbound message:");
    } else {
        out.println("\nInbound message:");
    }

    SOAPMessage message = context.getMessage();
    try {
        //System.out.println("CONTENT DESC: " + message.getContentDescription());
        message.writeTo(out);
        out.println("");   
    } catch (Exception e) {
        out.println("Exception in handler: " + e);
    }
        return true;
    }

finally, response from the server:

Outbound message:

<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/"&gt;&lt;S:Body&gt;&lt;ns2:getData xmlns:ns2="http://test.ba.lt/"/&gt;&lt;/S:Body&gt;&lt;/S:Envelope&gt;

Inbound message:

------=_Part_0_15572807.1280997662593
Content-Type: text/xml; charset=utf-8
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/"&gt;&lt;S:Header/&gt;&lt;S:Body&gt;&lt;ns2:getDataResponse xmlns:ns2="http://test.ba.lt/"&gt;&lt;return&gt;/9j/4AAQSkZJRgABAgEASABIAAD/7RZaUGhvdG9zaG9wIDMuMAA4klNA+
**<base64 data cut out>**
a+3dpYCSqnze46gqKXHUkSxaV0XBYxzvu8z7/ut1u1zBFFNLp7IwwRQiLGoUOztTSo4sTXz6SySGVy5ABPp1/9k=</return></ns2:getDataResponse></S:Body></S:Envelope>
------=_Part_0_15572807.1280997662593
Content-Type: image/jpeg
Content-ID: <[email protected]>
˙Ų˙ą
**<binary data cut out>**
~ńĶ×nŻŻ?ŽŁ¬†v«kķŻ?€’Ŗ|ŽćØ*)qŌ‘,ZWEĮcļ»Ģūžėu»\ĮSK§²0Į",j;;SJˇ,M|śK$†W.@śu˙Ł
------=_Part_0_15572807.1280997662593--

@MTOM annotation seems to haven effect, because I can see ant attachment, but attachment is not referenced from within Soap response message body. Am I missing something in the code? I'm using JAX-WS RI 2.1