problem with custom parameters

[siddharth aggarwal]

Hi,
 I want to trnasfer some custom parameters using apache SOAP RPC.I was trying to 
transfer a Vector.

My client code looks like.

// file Client.java
package dbcustom;
public class Client
{
 public static void main(String[] args) throws Exception 
  {
    URL url=new URL(args[0]); // Address of SOAP router
    String[] strArray = new String[2];
    Vect vect=new Vect();  // my custom parameter
    vect.v.addElement(args[1]);
    vect.v.addElement(args[2]);
   
    SOAPMappingRegistry registry = new SOAPMappingRegistry(  );
   BeanSerializer serializer = new BeanSerializer(  );
   registry.mapTypes(Constants.NS_URI_SOAP_ENC,
   new QName("urn:Vect-demo", "p"),
    Vector.class, serializer, serializer);   
  Call call=new Call();
  call.setSOAPMappingRegistry(registry);  
  call.setSOAPMappingRegistry(new SOAPMappingRegistry());
    call.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);
    call.setTargetObjectURI("urn:DBCUSTOM");
    call.setMethodName("searchList");
    Vector params=new Vector();
    params.addElement(new Parameter("vect",Vect.class,
                                   vect,null));       
    call.setParams(params);
    Response resp = null; 
    try  {resp = call.invoke(url, ""); 
         } 
    catch( SOAPException e ) 
         { System.err.println("Caught SOAPException (" + e.getFaultCode() + "): " + 
e.getMessage()); 
            System.exit(-1); 
         } 
 }
}

My server code looks like.

// file Server.java
package dbcustom;
public class Server
 {
   public String searchList(Vect v)
  {
   String param1=v.v.elementAt(0).toString();         String param2 = 
v.v.elementAt(1).toString();
return param1+param2;
 }
}

And I have a 3rd file on the server side which contains definition for my custom type 
Vect.

// file Vect.java

package dbcustom;
import java.util.*;
public class Vect
 {
   Vector v;   
 }

My doubts:
1)How should I register my custom type (I am using Tomcat server3.1.1) and am 
graphically deploying my services?
2)I am a little doubtful about the client side code.
especially the line:
  registry.mapTypes(Constants.NS_URI_SOAP_ENC,
   new QName("urn:Vect-demo", "p"),
where i have used urn:Vect-demo
3)I am getting an null pointer exception in the Client.java statement
    vect.v.addElement(args[1]);
4) Does Vect.java really have to be in the same package i.e. dbcustom as the server 
class.

I would be grateful if somebody could send me a code sample in which a custom 
parameter has been used and deployed. I don't think I am even deploying my service in 
the right way (though i have had success deploying services without custom parameters).

Regards,
Siddharth