How to populate a TableView that is defined in an fxml file that is designed in JavaFx Scene Builder
<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.paint.*?>

<AnchorPane id="AnchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="288.0" prefWidth="293.0" xmlns:fx="http://javafx.com/fxml">
<children>
    <TableView fx:id="tableView" layoutX="35.0" layoutY="28.0" prefHeight="200.0" prefWidth="227.0">
    <columns>
        <TableColumn prefWidth="75.0" text="UserId" fx:id="UserId" />
        <TableColumn prefWidth="75.0" text="UserName" fx:id="UserName" />
        <TableColumn prefWidth="75.0" text="Active" fx:id="Active" />
    </columns>
    </TableView>
</children>
</AnchorPane>

ResultSet rs = c.createStatement().executeQuery(SQL);

fx:controller="path.to.MyController"

package path.to;

public class MyController implements Initializable {

    @FXML private TableView<User> tableView;
    @FXML private TableColumn<User, String> UserId;
    @FXML private TableColumn<User, String> UserName;
    @FXML private TableColumn<User, String> Active;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        UserId.setCellValueFactory(new PropertyValueFactory<User, String>("id"));
        UserName.setCellValueFactory(new PropertyValueFactory<User, String>("name"));
        Active.setCellValueFactory(new PropertyValueFactory<User, String>("active"));

        tableView.getItems().setAll(parseUserList());
    }
    private List<User> parseUserList(){
        // parse and construct User datamodel list by looping your ResultSet rs
        // and return the list
    }
}