Problema JTable (NullPointerException)

[leandrof]

qui istanzio il vettore:

    JTable[] tabelle={this.tabella1, this.tabella2, this.tabella3, this.tabella4,         this.tabella5, this.tabella6, this.tabella7, this.tabella8, this.tabella9}; 

mentre ogni singola tabella viene creata in automatico dal compilatore, cioè crea questo:

tabella1 = new javax.swing.JTable();
----
        tabella3.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {
                "Somma Faccie", "Frequenza", "Probabilità"
            }
        ) {
            Class[] types = new Class [] {
                java.lang.Integer.class, java.lang.Double.class, java.lang.Double.class
            };
            boolean[] canEdit = new boolean [] {
                false, false, false
            };

            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
            }

            public boolean isCellEditable(int rowIndex, int columnIndex) {
                return canEdit [columnIndex];
            }
        });
        jScrollPane3.setViewportView(tabella3);
        tabella3.getColumnModel().getColumn(0).setResizable(false);
        tabella3.getColumnModel().getColumn(1).setResizable(false);
        tabella3.getColumnModel().getColumn(2).setResizable(false);