Code alteration - Basic problem or XML-RPC?

Question

I'm trying to alter the following client/server code to create an XML-RPC such that when the client offers an argument eg ?John? then the result of the method call returned to the client would be ?John*John? rather than the result of the equation currently shown.
I'm not sure if it's just my lack of knowledge or something in the basic data types in XML-RPC
Any help much appreciated.
Client
[ code ]
import java.util.*;
import org.apache.xmlrpc.*;
//simple XML-RPC client that makes an XML-RPC request to a Server
public class XMLRPCClient {
public static void main(String args[]) {
try {
// Specify the server
XmlRpcClient server = new XmlRpcClient("http://localhost/RPC2");
// Create request
Vector params = new Vector();
params.addElement(new Integer(17));
params.addElement(new Integer(13));
// Make a request and print the result
Object result = server.execute("sample.sum", params);
int sum = ((Integer ) result).intValue();
System.out.println("Response from server: " + sum);
} catch (Exception exception) {
System.err.println("JavaClient: " + exception);
[ /code ]
Server
[ code ]
import org.apache.xmlrpc.*;
//XMLRPCServer is a simple XML-RPC server
public class XMLRPCServer {
//Start up the XMLRPC server and register a handler.
public Integer sum(int x, int y) {
return new Integer(x+y);
public static void main (String [] args) {
try {
System.out.println("Attempting to start XML-RPC Server...");
WebServer server = new WebServer(80);
server.addHandler("sample", new XMLRPCServer());
server.start();
System.out.println("Started successfully.");
System.out.println("Accepting requests. (Halt program to stop.)");
} catch (Exception exception) {
System.err.println("JavaServer: " + exception);
[ /code ]

Answer 1

cause of the error:
After some extensive research on the web, it is found that that you are using an UTF-8 encoded file with byte-order mark (BOM). Java doesn't handle BOMs on UTF-8 files properly, making the three header bytes appear as being part of the document. UTF-8 files with BOMs are commonly generated by tools such as Window's Notepad. This is a known bug in Java, but it still needs fixing after almost 8 years...
There are some hexadecimal character at the begining of the file, which is giving error"content not allowed in prolog". No solution is provided for this till now.
Example: suppose your file start with <?xml version="1.0" encoding="utf-8"?>. you will see this in a editor. But if you open this file with any hexadecimal editor you will find some junk character in the start of the file.that is causing the problem
solution:
1) convert your file into a string and then read the file from the forst character that in my case the first character will be "<".so the junk character will not be there in the string and then again convert it into a file.
2) some people are able to solve this problem by changing the "utf-8" to "utf-16". remember only in some case. some times this problem also exits in "utf-16" file.
3) some are able to solve this problem by changing the LANG to US.en.
4) If the first three bytes of the file have hexadecimal values EF BB BF then the file contains a BOM.so you can also handle by your own.
5)Download a hexadecimal editor and remove the BOM.
6) In case you are not able to think furthe then please to more research in internet may be you find some other solution to this problem. But These solution are some type of hack not exactly a solution.