Async Call Problem on TomCat Server

Hi all,

i've a problem with GWT's RPC call mode.

these is my code: 

server.tutti_clienti(new AsyncCallback<Cliente>() {

public void onSuccess(Cliente result) {

log = log + " 1 - Cliente ";

tutti_clienti = result;

cliente.addItem("- Seleziona un Cliente -","null");

 

for(int i=0; i<n_clienti; i++)

 

cliente.addItem(tutti_clienti.getCliente(i), String.valueOf(tutti_clienti.getId(i)));

}

public void onFailure(Throwable caught) {

log = log + " 1.1 - ERRORE Cliente " + caught;

System.out.println("Errore server.tutti_clienti(): " + caught.getMessage());

}

});

 "cliente" is a ListBox and "tutti_clienti" is a compose of ArrayList.

These type of code is written for many ListBox with many differt server call.

The problem is that if i run it on a TomCat server not all of the ListBox are loaded, but if i run it in DebugMode it work.

The error that i retrive in "server" mode are;

NullPointerException OR Fail to call the server (etc etc).

Thanks in advance and sorry for my english.

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