null parameter problem while calling .net web service from java client

I have a C# .NET web service and a Java client .
My java client is able to call the C# method , but when the client calls methods containing complex type parameters , they are ending up being null on the .net side eventhough I am sending the parameters with valid values.
I traced also the SOAP messages and they are also semms OK. But why are they arriving null to .net side. What goes wrong? Did anybody
whom faced this problem could solve it and how.

As I see this is a very common problem as I searched similar forums. So any acceptable answer will be useful to many people suffering this problem.

Thanks to everyone that answers me...
7/25/2005 1:56:23 PM 7071 articles. 0 followers. Follow

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Check to see that the elements/attributes on the request SOAP message
sent by the java client to the server are in the correct namespace (as
required by the service definition)

Tomas Restrepo [MVP]
7/26/2005 2:34:02 AM
Here is the part of the SOAP message that I copied from the MSSOAP toolkit Trace tool :

 <multiRef id="id0" soapenc:root="0" soapenv:encodingStyle="" xsi:type="ns3:SessionInfo"
="" xmlns:soapenc="">
              <HostID href="#id9" />
              <returnCode href="#id10" />
              <sessionId href="#id11" />
              <userId xsi:type="xsd:string">a</userId>
          <userLevel href="#id12" />

And this is the corresponding class that I built by using wsdl.exe tool

[System.Xml.Serialization.SoapTypeAttribute("SessionInfo", "")]
public class SessionInfo
    /// <remarks/>
    public int OwnerHostID;
    /// <remarks/>
    public ReturnCode returnCode;
    /// <remarks/>
    public int sessionId;
    /// <remarks/>
    public string userId;
    /// <remarks/>
    public int userLevel;
This is from the abstract class that I built using wsdl.exe tool

    [System.Web.Services.Protocols.SoapRpcMethodAttribute("",  RequestNamespace="", ResponseNamespace="")]

    public abstract void notifyTableData(SessionInfo in0);


And This is from my implementation class

        public  override void notifyTableData(SessionInfo session)
                if( session!= null )
                    Logger.append("session is null",Logger.INFO);
            catch (Exception exc)
                Logger.append("Exception @ NotificationService.notifyTableData "+exc.ToString(),Logger.ERROR);

Looking at the above codes I don't see anything wrong but if there is could you explain me. Hence I should say that
the web service methods with no attributes work fine but those only getting parameters as input do not work as the
parameters are  coming null to the service.

7/26/2005 5:53:53 AM
I think you need to put this attribute:
  [System.Web.Services.Protocols.SoapRpcMethodAttribute("",  RequestNamespace="", ResponseNamespace="")]

on the method of the implementation class (the one derived from the WSDL.exe-generated one), because the ASP.NET runtime, unfortunately, does not look for those attributes in base classes, only in the implementation one...

Tomas Restrepo [MVP]
7/27/2005 11:47:03 AM
thank you very much that solved my problem :)
7/28/2005 9:20:56 AM

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