xsi:type of root element not being added to CXF request

[Alessio Bolognino]

Hi, I've imported a wsdl using wsdl2java with JAXB as databinding, the
generated Service interface is like this:

    @WebService(targetNamespace = "http://www.sii.example.it/SWG1";, name =
"SWG1")
    @XmlSeeAlso({it.au.switchgas.swg1.messaggio.ObjectFactory.class,
                 it.au.switchgas.swg1.strutturegenerali.ObjectFactory.class,
                 it.au.switchgas.strutturegas.ObjectFactory.class,
                 it.au.switchgas.swg1.flussi.ObjectFactory.class})
    @SOAPBinding(style = SOAPBinding.Style.RPC)
    public interface SWG1 {
        @WebMethod(operationName = "SWG1.0050", action = "SWG1.0050")
        @WebResult(name = "MessaggioSII", targetNamespace = "
http://www.sii.example.it/SWG1";, partName = "MessaggioSII")
        public it.au.switchgas.swg1.messaggio.ResponseMessageType swg10050(
            @WebParam(partName = "MessaggioSII", name = "MessaggioSII")
            it.au.switchgas.swg1.messaggio.SWG1MessageType messaggioSII
        );
    }

SWG1MessageType is a subclass of MessageType and it's defined like this:

    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = "SWG1MessageType")
    public class SWG1MessageType extends MessageType { }

the provider of the service is currently rejecting my messages complaining
about
the MessaggioSII missing the xsi:type definition, inspecting the request I
indeed noticed
the lack of xsi:type for the MessaggioSII element:


    <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
        <soap:Body>
            <ns1:SWG1.0050 xmlns:ns1="http://www.sii.example.it/SWG1";>
                <MessaggioSII
                    xmlns:ns2="
http://www.example.it/schemas/SII_AU/StruttureGenerali/v1.9";
                    xmlns:ns3="
http://www.example.it/schemas/SII_AU/Flussi_SWG1/v1";
                    xmlns:ns4="
http://www.example.it/schemas/SII_AU/StruttureGAS/v1.7";
                    xmlns:ns5="
http://www.example.it/schemas/2010/SII_AU/MessaggioSII";>
                    <!-- no xsi:type here -->
                    <ns5:RichiestaSII
                        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
"
                        xsi:type="ns5:RichiestaSwitchingRichiestaSIIType">
                        <!-- omissis -->
                    </ns5:RichiestaSII>
                    <ns5:DatiSII
                        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
"
                        xsi:type="ns5:RichiestaSwitchingDatiSIIType">
                        <!-- omissis -->
                    </ns5:DatiSII>
                </MessaggioSII>
            </ns1:SWG1.0050>
        </soap:Body>
    </soap:Envelope>

Is this behaviour expected?
Is there a way to add the xsi:type to the MessaggioSII element?

The only workaround I've found so far is to add a type attribute myself but
this
is not optimal either since I have to "guess" the namespace prefix (ns6 in
the example)

    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = "SWG1MessageType")
    public class SWG1MessageType extends MessageType
    {
        @XmlAttribute(name = "type", namespace =
XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI)
        private String xsiType = "ns6:SWG1MessageType";
    }


All this is doable with xmlbeans but I'm trying to move to JAXB.


--
Alessio Bolognino