Webservice not ready - no response

Question

Hi!
I hope I am in the right place to ask my question.
I have a mobile Flex project in which I have to work with WSDL. I followed some tutorials and think that I should have everything needed to communicate with the server (the code there is implemented by a colleague of mine).
My client side looks like this:
protected function callWebService():void
     var ws:services.myservices.MyService = new MyService();
     var responder:AsyncResponder = new AsyncResponder( handleResult, handleFault );
     var token:AsyncToken = ws.MyMethod("test");
     token.addResponder(responder);
private function handleResult(result:Object) : void
     // not called
private function handleFault(event:Object) : void
     // not called
I thought with the AsyncResponder added to my token one of the methods handleResult and handleFault should be called but it isn't. I don't get an exception, but there isn't a result either. Just nothing happens.
So I debugged a little more and came to the class mx.rpc.soap.Operation.as with the method "send". I stepped through this method and everything seemed fine until I got to the end of the method where there is this piece of code:
var pc:OperationPendingCall = new OperationPendingCall(argsToPass, combinedHeaders, token);   
if (webService.ready)      // here ready is always false
     invokePendingCall(pc);
else // if (!webService.wsdlFault)
     log.debug("Queueing SOAP operation {0}", name);
     if (!pendingInvocations)
          pendingInvocations = [];
     pendingInvocations.push(pc);
Because webService.ready is always false, my SOAP call is never made I think. What can I do? Where's the problem? I couldn't find any hint...
Thank you for reading and helping (hopefully)!
Edit: I forgot to add that when I test my method with Flash Builder (with the GUI) I get the following error: "InvocationTargetException:Beim Erstellen der  SOAP-Anforderungsmeldung ist ein Fehler  aufgetreten. Ursache:java.lang.ArrayIndexOutOfBoundsException: 2"
But unfortunately this is not helping me.

Answer 1

I did find more things out.
With this webservice I had no problem getting the answer I expected:
http://www.kirupafx.com/WebService/TopMovies.asmx?WSDL
So I tested a bit more with that and with our own webservice and finally could test the methods via the GUI when I filled out every parameter. Before, I left some of them empty (which should work on the serverside but didn't on Flash Builder side - by the way: is there a way to tell Flash Builder that it should accept empty strings?). But the XML which I got as answer didn't give a result and when I called the webservice via code the "handleResult" or "handleFault" method was still not called (but with the TopMovie webservice it was).
My collegue and I were then testing with wireshark and found out that the two webservices use different protocols.
TopMovie uses document-literal while he used rpc encoded. So with rpc encoded there is some security issue (http://livedocs.adobe.com/flex/3/html/help.html?content=data_access_3.html) which is why the webservice is never really called. He has to add a crossdomain.xml on the serverside or something like that. But he is not that sure about that because with wireshark we never saw a call for that. But I'm confident that we will find out.