JAVA EE Web Service SOAP

@WebService
@SOAPBinding(style = SOAPBinding.Style.RPC)
public interface HistoricalResultProvider {

@WebMethod
    @WebResult(name = "session_uuid")
    UUID sessionStart(
            @WebParam(name = "user") String user,
            @WebParam(name = "password") String password,
            @WebParam(name = "language") String language)
            throws MdcRsExportFaultMsg;
.
.
.
}

@WebService(endpointInterface = "com.accessinterfaces.soap.SOAPHistoricalResults", serviceName = "/HistoricalExport")
public class SOAPHistoricalResults implements HistoricalResultProvider {

@Override
    public UUID sessionStart(String user, String password, String language) throws MdcRsExportFaultMsg {
      //to do
    }
}