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From "bagas" <>
Subject RE: [Newbie Quetion] How can I check my RPC return value
Date Tue, 23 Mar 2004 03:02:01 GMT
I am sorry but I think your answer did not help . probably because my
previous question confusing .
Here with I'll give you another example hopefully this would be clear .
Suppose I have a Server =
public class TesServer {
   public TesServer() {
        WebServer webserver = null;
        try {
            webserver = new WebServer (7001);
        } catch (UnknownHostException e) {
            e.printStackTrace();  //To change body of catch statement
use Options | File Templates.
        webserver.addHandler("Something",new SomethingHandler());
    public static void main(String [] args)
          new TesServer();
with a Handler =
class SomethingHandler implements XmlRpcHandler
    public Object execute(String method, Vector params)
       // DO SOMETHING

       return params;
and a Client =
public class TesXmlRPC  {
    public static void main(String[] args) {
        try {
            XmlRpcClient xmlrpc = new
            Vector v = new Vector(1);
            Vector result = (Vector) xmlrpc.execute("Something.methodX",
        } catch (Exception e) {
Then I run my Server ...
Then I run my Client ...
When my client "try to" execute 
Vector result = (Vector) xmlrpc.execute("Something.methodX", v);  // plz
see TesXmlRPC class
Then the Client connect to server  ..But Before the server produce any
result (so the method above not done yet) .. The connection is somehow
broken ... // see  class SomethingHandler
Then in the Server console screen is written something like this........ Connection reset by peer: socket write error
// this happen because I kill the Client in the middle of executing
"xmlrpc.execute" .
My Question is where can I catch the exception (example : Connection reset by peer: socket write error
) in my Server class or Handler Class?
Is my question is clear now? If not please ask me for more information .
Thank you ...
-----Original Message-----
From: Waldron, Terry [mailto:waldront@KGH.KARI.NET] 
Sent: Saturday, March 20, 2004 1:15 AM
Subject: RE: [Newbie Quetion] How can I check my RPC return value
Try Catch Block will do the trick...
-----Original Message-----
From: Dave Stewart []
Sent: March 19, 2004 1:00 PM
Subject: Re: [Newbie Quetion] How can I check my RPC return value
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
Here is an example :  
Suppose I have a Class =  
Public class AServer implements XmlRpcHandler 
            WebServer serv; 
            public static void main(String [] args) 
            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 params).

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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