doubt: new to xmlrpc programming

  i am new to java as wellas to xml rpc i have a doubt these are the programs
   
  program:AreaHandler
   
  public class AreaHandler {
  public Double rectArea(double length, double width) {
  return new Double(length*width);
  }
  public Double circleArea(double radius) {
  double value=(radius*radius*Math.PI);
  return new Double (value);
  }
  }
   
  program: AreaServer
  import java.io.IOException;
  import org.apache.xmlrpc.WebServer;
  import org.apache.xmlrpc.XmlRpc;
  public class AreaServer {
  public static void main(String[] args)throws IOException {
  if (args.length < 1) {
  System.out.println(
  "Usage: java AreaServer [port]");
  System.exit(-1);
  }
  // Start the server, using built-in version
  System.out.println("Attempting to start XML-RPC Server...");
  WebServer server = new WebServer(Integer.parseInt(args[0]));
  System.out.println("Started successfully.");
  // Register our handler class as area
  server.addHandler("area", new AreaHandler( ));
  System.out.println(
  "Registered AreaHandler class to area.");
  System.out.println("Now accepting requests. (Halt program to stop.)");
  
  }
  }
   
  program:AreaClient
   
  import java.io.IOException;
  import java.lang.*;
  import java.util.Vector;
  import org.apache.xmlrpc.XmlRpc;
  import org.apache.xmlrpc.XmlRpcClient;
  import org.apache.xmlrpc.XmlRpcException;
  public class AreaClient {
  public static void main(String args[]) {
  if (args.length < 1) {
  System.out.println(
  "Usage: java AreaClient [radius]");
  System.exit(-1);
  }
  try {
  // Create the client, identifying the server
  XmlRpcClient client =
  new XmlRpcClient("http://mss-b8gg9t34l4l:8899/");
  // Create the request parameters using user input
  Vector params = new Vector( );
  params.addElement(new Double(args[0]));
  // Issue a request
  Object result =
  client.execute("area.circleArea", params);
  // Report the results
  System.out.println("The area of the circle would be: " + result.toString( ));
  } catch (IOException e) {
  System.out.println("IO Exception: " + e.getMessage( ));
  } catch (XmlRpcException e) {
  System.out.println("Exception within XML-RPC: " + e.getMessage( ));
  }
  }
  }
   
  I executed all the three files such as AreaHandler,Server,Client but whlie executing  AreaClient i am getting this below mentioned run time error
   
  Exception in thread "main" java.lang.NoClassDefFoundError: 
  org/apache/commons/codec/DecoderException
        at org.apache.xmlrpc.XmlRpc.createTypeFactory(XmlRpc.java:238)
        at org.apache.xmlrpc.XmlRpc.<init>(XmlRpc.java:193)
        at 
  org.apache.xmlrpc.XmlRpcClientResponseProcessor.<init>(XmlRpcClientRe
sponseProcessor.java:48)
        at org.apache.xmlrpc.XmlRpcClientWorker.<init>(XmlRpcClientWorker.java:4
3)
        at org.apache.xmlrpc.XmlRpcClient.getWorker(XmlRpcClient.java:347)
        at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:190)
        at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:184)
        at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:177)
        at AreaClient.main(AreaClient.java:27)
   
  its urgent i have a demo tommorrow.i need help.
   
  Ramya.

				
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