Exception to insert Object into an Array java

Question

I'm trying to modify my first version, where it had initialized values in an array and allow dynamically inserting elements into the vector. I do this because the number of elements to manage can change.

My first version:

public ReadandWrite(SessionChannel mySession,Logger logger,List<NodeId> listaReadNodi, Connection conn) {
        this.mySession = mySession;
        this.logger = logger;
        this.conn = conn;
        
        // Create nodes array
        nodesToRead1 = new ReadValueId[]{   new ReadValueId(listaReadNodi.get(0), Attributes.Value, null, null),new ReadValueId(listaReadNodi.get(1), Attributes.Value, null, null),
                                            new ReadValueId(listaReadNodi.get(2), Attributes.Value, null, null),new ReadValueId(listaReadNodi.get(3), Attributes.Value, null, null),
                                            new ReadValueId(listaReadNodi.get(4), Attributes.Value, null, null)};
        
        cStatusPC = new CheckStatoMacchina();
        readNodesArray = new ReadNodeArray();
        
    }

Now I'm trying to rewrite in this way:

public ReadandWrite(SessionChannel mySession,Logger logger,List<NodeId> listaReadNodi, Connection conn) {
        this.mySession = mySession;
        this.logger = logger;
        this.conn = conn;
        
        // Create nodes array
        
        List<NodeId> listaNodi = new ArrayList<NodeId>();
        
        listaNodi.add(new NodeId(3, "\"Gest\".\"InProduzione\""));
        listaNodi.add(new NodeId(3, "\"Gest\".\"AusInseriti\""));
        listaNodi.add(new NodeId(3, "\"Gest\".\"InAllarme\""));     
        listaNodi.add(new NodeId(3, "\"Gest\".\"CntBuoni\""));
        listaNodi.add(new NodeId(3, "\"Gest\".\"CntScarti\""));
        
        try {
            int count=0;
        for(NodeId nodId: listaNodi) {
            
            nodesToRead1[count] = new ReadValueId(nodId, Attributes.Value, null, null);
            
            nodesToRead1 = Arrays.copyOf(nodesToRead1, count + 1);
            
        
        }
        } catch (Exception e) {
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
        
        cStatusPC = new CheckStatoMacchina();
        readNodesArray = new ReadNodeArray();
        
    }

But I get an Null Exception when I run the code.

java.lang.NullPointerException
    at com.ids.applicationProcessing.ReadandWrite.<init>(ReadandWrite.java:85)
    at com.ids.main.IdsMain.main(IdsMain.java:85)

and this statement retun null nodesToRead1[count] = new ReadValueId(nodId, Attributes.Value, null, null);

listaNodi isn't empty.

Is there a way to insert those elements into the array?