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Problems in parsing results of web service invocation

Hi everybody, I'm studying ws technology and have to write a service that parse an xml document and print its content (using Apache Tomcat and Axis2). The xml is like this:
[code]
<?xml version="1.0" encoding="UTF-8"?>


Navel
Arance







Tarocco
Arance







Limoni_di_Sorrento
Limoni






Clementine
Mandarini






Limoni_sfusi
Limoni






Mandarini
Mandarini






Arance_da_giardino
Arance






[/code]

I've wrote two beans for the "prodotto" and "confezione" elements and a class named ProdottoDB to deal with those data server side (I can post them if it can help).

After that I wrote a server class and a client class, and at that point the problem started to come out: when I launch the client this is the result:
[code]
ID: 1
Categoria: Arance
Nome: Navel
Exception in thread "main" java.lang.NullPointerException
at it.terramica.client.TerramicaClient.main(TerramicaClient.java:45)
[/code]

The client class:
[code]
public class TerramicaClient {

public static void main(String[] args) throws Exception {

BufferedReader console = new BufferedReader(new InputStreamReader(System.in));

System.out.println("Scegliere l'operazione da eseguire: ");
System.out.println("1 - Elenco prodotti: ");
System.out.println("2 - Ricerca prezzo: ");
int sel = Integer.parseInt(console.readLine());
//
//System.out.println("I prodotti non sono disponibili");

if (sel==1) {
ArrayList prods = elenca();
for (Prodotto p : prods) {
System.out.println("ID: " + p.getID());
System.out.println("Categoria: " + p.getCategoria());
System.out.println("Nome: " + p.getNome());

Confezione[] confs = p.getConfezione();
for (int i=0; i<confs.length; i++) {
System.out.println("Tipo confezione: " + confs[i].getTipo());
System.out.println("Peso confezione: " + confs[i].getPeso());
System.out.println("Prezzo confezione: " + confs[i].getPrezzo());
}
}
}

if (sel==2) {
System.out.println("ID?: ");
int id = Integer.parseInt(console.readLine());
System.out.println("Tipo?: ");
String tipo = console.readLine();

float res = prezzo(id, tipo);
if (res == -1)
System.out.print("ERRORE: l'articolo cercato non
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