JAX WS not producing correct HTTP request

[Somak Dalui]

I have generated the stub files through wsimport from the remote wsdl and have created a standalone client. Now when I am running the client, the HTTP request that is produced is this :

---[HTTP request - http://www.transportdirect.info/EnhancedExposedServices/CarJourneyPlannerSynchronous/v1/CarJourneyPlannerSynchronousService.asmx]---
Content-type: text/xml;charset="utf-8"
Soapaction: "http://www.transportdirect.info/TransportDirect.EnhancedExposedServices.CarJourneyPlannerSynchronous.V1/GetGridReference"
Accept: text/xml, multipart/related, text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
<?xml version="1.0" ?>
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
<S:Header>
<wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
<wsse:UsernameToken>
<wsse:Username>USERNAME</wsse:Username>
<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">PASSWORD</wsse:Password>
</wsse:UsernameToken>
</wsse:Security>
</S:Header>
<S:Body>
<GetGridReference xmlns="http://www.transportdirect.info/TransportDirect.EnhancedExposedServices.CarJourneyPlannerSynchronous.V1">
<transactionId>bfe2ccbe-9197-4992-9073-cd3a3c0e5c47</transactionId>
<locationType>Postcode</locationType>
<locationValue>W11</locationValue>
</GetGridReference>
</S:Body>
</S:Envelope>
--------------------

Now, the SOAP Envelope part is perfectly alright as I have tested it with SOAP tools and have got correct output. But the above HTTP request is always giving me


---[HTTP response - http://www.transportdirect.info/EnhancedExposedServices/CarJourneyPlannerSynchronous/v1/CarJourneyPl
annerSynchronousService.asmx - 500]---
null: HTTP/1.1 500 Internal Server Error
Cache-control: private
X-ua-compatible: IE=EmulateIE7
Content-type: text/html; charset=utf-8
Content-length: 7424
Connection: close
X-powered-by: ASP.NET

followed by lots of html tags, describing some error.

My Java client code looks like this -

CarJourneyPlannerSynchronousService service = new CarJourneyPlannerSynchronousService();
port = service.getCarJourneyPlannerSynchronousServiceSoap();
port.getGridReference(transactionId, "bla-bla", "bla-bla");

Can you please tell me what am I missing here ? Please let me know if you want to see more code.

Thanks.