Load into table from SQL Query

public void cargarMateriales() {
        try {
            Connection conn = Conexion.GetConnection();
            Statement st = conn.createStatement();
            ResultSet rs = st.executeQuery("SELECT idCategoriaMaterial, Nombre, Descripcion FROM categoriamaterial");

            String[] columns = {
                "ID", "Nombre", "Descripcion"
            };

            DefaultTableModel tm = new DefaultTableModel(null, columns) {
                @Override
                public boolean isCellEditable(int rowIndex, int colIndex) {
                    return false;
                }
            };

            while (rs.next()) {
                String[] row = {
                    rs.getString(1), rs.getString(2), rs.getString(3)
                };

                tm.addRow(row);
            }

            jTable1.setModel(tm);
        } catch (SQLException e) {
            Logger.getLogger(this.getName()).log(Level.SEVERE, null, e.getMessage());
            JOptionPane.showMessageDialog(this, e.getMessage());
        }
    }