how to request service with complexType

I implement service with Flex like:

<mx:WebService

wsdl="http://idme.identita.com:8080/andromeda/service/ws?wsdl" id="testService" showBusyCursor="true

"

useProxy="

false">

<mx:operation name="process" result="resultHanlder(event);">

<mx:request>

<TokenDisplayAuthenticationRequest>

<otp> {otp.text}

</otp>

<serialNumber> {serial.text}

</serialNumber>

</TokenDisplayAuthenticationRequest>

</mx:request>

</mx:operation>

</mx:WebService>

Our web service only one operation "process", but there are a lot of request & response. But it did not work, can some help me to check what problem in this code?

Thanks,

Java code with CXF like:

private static final QName SERVICE_NAME = new QName("http://www.identita.com/andromeda/services", "AndromedaService");
private static final String WEB_URL="http://idme.identita.com:8080/andromeda/service/ws?wsdl" ;

AndromedaService ss = new AndromedaService(wsdlURL, SERVICE_NAME);

Andromeda port = ss.getAndromedaPort();

TokenDisplayAuthenticationRequest authenticationRequest = new TokenDisplayAuthenticationRequest();

authenticationRequest.setSerialNumber(serial);
  authenticationRequest.setOtp(otp);
   TokenDisplayAuthenticationResponse _process__return = (TokenDisplayAuthenticationResponse)port.process(authenticationRequest);