Data truncation: Incorrect integer value: '' for column 'idFactura' at row 1

When I run my application in java, everything works perfect for me without anything altering it, but that little detail comes out. What is the reason? Because it is derived from a table field in the database.

The table is called Invoice.

Save button (JAVA code):

Connection con=null;
        try{
            con=getConnection();
            ps=con.prepareStatement("INSERT INTO factura (idFactura, Precioneto, precioIVA, costoIVA, fechaCompra, HoraCompra, Distribuidor, MetodoPago) VALUES (?,?,?,?,?,?,?,?)");
            ps.setString(1, txtid.getText());
            if(txtid.getText().equals("")){
                JOptionPane.showMessageDialog(null, "Rellenar campo ID");
            }
            ps.setString(2, txtPrecioNeto.getText());
            if(txtPrecioNeto.getText().equals("")){
                JOptionPane.showMessageDialog(null, "Rellenar campo Precio Neto");
            }
            ps.setString(3, txtPrecioIVA.getText());
            if(txtPrecioIVA.getText().equals("")){
                JOptionPane.showMessageDialog(null, "Rellenar campo Precio IVA");
            }
            ps.setString(4, txtCostoIVA.getText());
            if(txtCostoIVA.getText().equals("")){
                JOptionPane.showMessageDialog(null, "Rellenar campo Costo IVA");
            }
            ps.setString(5, txtFechaCompra.getText());
            if(txtFechaCompra.getText().equals("")){
                JOptionPane.showMessageDialog(null, "Rellenar campo Fecha de Compra");
            }
            ps.setString(6, txtHoraCompra.getText());
            if(txtHoraCompra.getText().equals("")){
                JOptionPane.showMessageDialog(null, "Rellenar campo Hora de Compra");
            }
            ps.setString(7, txtDistribuidor.getText());
            if(txtDistribuidor.getText().equals("")){
                JOptionPane.showMessageDialog(null, "Rellenar campo Distribuidor");
            }
            ps.setString(8, txtPago.getText());
            if(txtPago.getText().equals("")){
                JOptionPane.showMessageDialog(null, "Rellenar campo Pago");
            }
            int res=ps.executeUpdate();
            if(res>0){
                JOptionPane.showMessageDialog(null, "Se ejecuto correctamente");
                limpiarCajas();
            }else{
                JOptionPane.showMessageDialog(null, "Error al ejecutar la conexion");
                limpiarCajas();
            }
        }catch(Exception e){
            System.err.println(e);
        }