Re: Trouble with WOWebServiceClient invoke

A bit late but...

On 07/06/2007, at 11:23 PM, Robert Miners wrote:

> I'm consuming a WebService written with ASP.net that has a method  
> that uses an 'out' parameter, i.e. of this form.
>
> [WebMethod]
> int GetResultViaOutParam(out int out_param)
>
> I have no problems if the method has no 'out' parameters, i.e. of  
> the form.
>
> [WebMethod]
> int GetResultWith2InParams(int param1, int param2)
>
> The WebObject code for the 'no out params' method is
>
> int arg1 = 3;
> int arg2 = 4;
> Object[] arguments = { new Integer(arg1), new Integer(arg2) };
> String operation = new String("GetResultWith2InParams");
> Object res = serviceClient().invoke(serviceName(), operation,  
> arguments);
>
> The WebObject code for the 'out param' method is
>
> int arg1 = 0;
> Object[] arguments = { new Integer(arg1) };
> String operation = new String("GetResultViaOutParam");
> Object res = serviceClient().invoke(serviceName(), operation,  
> arguments);
>
> The exception that is raised by the attempt to invoke  
> 'WebMethodWithOutParam' is
>
> Error: Error invoking operation: javax.xml.rpc.JAXRPCException:  
> Number of parameters passed in (1) does not match the
>          number of IN/OUT parameters (0) from the addParameter()  
> calls.

Did you get this working?

Consider an 'out' parameter like an &arg in C. It returns a value  
rather than receives one. As Java has no such concept, it seems you  
need to use a holder like this:

javax.xml.rpc.holders.IntHolder outVal = new  
javax.xml.rpc.holders.IntHolder();
Object[] arguments = { outVal };
<...>

int receivedOutValue = outVal.value;

See 'holders'
http://ws.apache.org/axis/java/user-guide.html
http://ws.apache.org/axis/java/apiDocs/index.html

with regards,
--

Lachlan Deck