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From Dave Stewart <>
Subject Re: [Newbie Quetion] How can I check my RPC return value
Date Fri, 19 Mar 2004 18:00:20 GMT
Hi Bagas!

(Caution: I'm not any certified expert in any way, just played with 
this myself a bit ...)

I'm not sure I'm following your question, but I'll give it a shot 
anyway ...

On Mar 18, 2004, at 10:49 PM, bagas wrote:

> Dear All, 
> I am building a XML-RPC Server using org.apache.xmlrpc.WebServer.
> I now encounter a problem; the problem is how can I track my response 
> (result). 
> Here is an example : 
> Suppose I have a Class = 
> Public class AServer implements XmlRpcHandler
> {
>             WebServer serv;
>             public static void main(String [] args)
>             {
>                         Aserver(100);
>             }           
>              public AServer(int i)
>             {
>                         serv = Webserver(i);
>                         serv.addHandler("$default", this);
>             }
> 		public Object execute(String method, Vector params)
>             {
>                         //do something
>                         return something;
>             }
> } 
> after AServer running ….. there are 3 message coming …..

Um, clarification here ... you mean you've called execute with a method 
name and 3 arguments in params, right?

> then the server send a response (result of the method) right ??

According to the documentation, execute() should either return a result 
*OR THROW AN EXCEPTION*. The result will be a java.lang.Object unless 
something went wrong, in which case it will throw a java.lang.Exception 
that will need to be caught somewhere.

> My question is how can I track the response (result) of the message if 
> I urgently needed to know whether the response (result) is sent or 
> fail to be sent.

Well, how is your server (AServer) dealing with it? You could either be 
trapping the exception with a try/catch block or passing it back to the 
caller (the class that invoked execute() and sent 3 messages in 

Maybe that's the hint you need, the documentation for the interface 
XmlRpcHandler specifies that the execute() method will either return a 
result (as a java.lang.Object) or will throw an exception (specifically 
a java.lang.Exception). If the result was sent, it will be in the 
Object returned. If it failed, details will be in the Exception.

If you are trapping that Exception in AServer itself, then I would 
suggest creating an Object that you could return that will be 
recognized as a problem and testing for that in the calling method. If 
you are passing the Exception back to the invoker (which is what I 
would do), then I don't get the question since it should be obvious if 
it worked or not (you'll either get an Object back or you'll catch an 
Exception, which kind of answers the question doesn't it?)

> Thank you very much …

I just hope I've been of some help. ;-)

Dave Stewart
Aqua~Flo Supply (Goleta CA)
dstewart at aquaflo dot com

Law of Probability Dispersal:
	Whatever it is that hits the fan
	will not be evenly distributed.

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