TornadoFX TableView. Scrolling the large amount of rows leads to UI freezing

Question

I have a windows desktop application on Kotlin and I'm using JDK Zulu11 with JavaFX and TornadoFX 2.0.0. I faced the problem with scrolling of large amount of rows (~4mln) in the TableView. I have something like a player and when it starts I just need to do autoscroll to the row corresponding to the player current position. So to make playing smooth I do it by calling scrollTo method every 50 milliseconds, 20 times per second. I observed that approximately at 300000 UI starts freezing and at 500000 it is almost dead. When I increase the delay from 50ms to 200ms or 500ms the situation is the same, UI gets freeze. When I used JDK Zulu1.8 with JavaFX and TornadoFX 1.7.2 just for check all was perfect, all is playing very smooth and fast enough. With Oracle JDK 1.8 all is ok also. But I need to migrate to JDK 11 because I have some important dependencies.

So the question is what is wrong with JDK 11(JavaFX) and TornadoFX 2.0.0 and how it can be fixed?

Thanks a lot for any help.

PS: Here is the minimal reproducible example, I just found some TableView example on javacodegeeks and modified it, so please chek with JDK1.8 and with OpenJDK11, I used Azul Zulu 11. Also here is the video with demonstration.

import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.event.EventType;
import javafx.scene.control.Button;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.layout.HBox;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.scene.paint.Color;
import javafx.scene.control.Label;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.control.TableColumn;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import java.util.List;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;

public class FxTableViewExample1 extends Application {

    public static class Book {
        private SimpleIntegerProperty index;
        private SimpleStringProperty title;
        private SimpleStringProperty author;

        public Book () {
        }

        public Book (Integer i, String s1, String s2) {
            index = new SimpleIntegerProperty(i);
            title = new SimpleStringProperty(s1);
            author = new SimpleStringProperty(s2);
        }

        public int getIndex() {
            return index.get();
        }

        public void setIndex(int index) {
            this.index.set(index);
        }

        public String getTitle() {
            return title.get();
        }
        public void setTitle(String s) {
            title.set(s);
        }

        public String getAuthor() {
            return author.get();
        }
        public void setAuthor(String s) {
            author.set(s);
        }

        @Override
        public String toString() {
            return (index.get() + ": " + title.get() + ", by " + author.get());
        }
    }


    private static final Integer COUNT = 10000000;
    private static final Integer DELTA = 5000;
    private static final Integer PERIOD = 50;

    public static final EventType<Event> ScrollEventType = new EventType<>("ScrollEvent");
    public static final EventType<Event> StopEventType = new EventType<>("StopEvent");

    public static class ScrollEvent extends Event {
        public Integer position = 0;
        public ScrollEvent(Integer position) {
            super(ScrollEventType);
            this.position = position;
        }
    }

    public static class StopEvent extends Event {
        public StopEvent() {
            super(StopEventType);
        }
    }

    private TableView<Book> table;
    private ObservableList<Book> data;
    private Text actionStatus;
    private Button startButton;
    private Button stopButton;
    private Integer count = 0;
    private SimpleIntegerProperty currentPositionProperty = new SimpleIntegerProperty(0);
    private Timer timer = null;

    public static void main(String [] args) {
        Application.launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Table View Example 1");

        // Books label
        Label label = new Label("Books");
        label.setTextFill(Color.DARKBLUE);
        label.setFont(Font.font("Calibri", FontWeight.BOLD, 36));
        HBox labelHb = new HBox();
        labelHb.setAlignment(Pos.CENTER);
        labelHb.getChildren().add(label);

        // Table view, data, columns and properties

        table = new TableView<>();
        data = getInitialTableData();
        table.setItems(data);

        TableColumn<Book, Integer> indexCol = new TableColumn<>("Index");
        indexCol.setCellValueFactory(new PropertyValueFactory<Book, Integer>("index"));
        TableColumn<Book, String> titleCol = new TableColumn<Book, String>("Title");
        titleCol.setCellValueFactory(new PropertyValueFactory<Book, String>("title"));
        TableColumn<Book, String> authorCol = new TableColumn<Book, String>("Author");
        authorCol.setCellValueFactory(new PropertyValueFactory<Book, String>("author"));

        table.getColumns().setAll(indexCol, titleCol, authorCol);
        table.setPrefWidth(450);
        table.setPrefHeight(300);
        table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

        table.getSelectionModel().selectedIndexProperty().addListener(
                new RowSelectChangeListener());

        // Status message text
        actionStatus = new Text();
        actionStatus.setFill(Color.FIREBRICK);

        startButton = new Button("Play");
        stopButton = new Button("Stop");
        stopButton.setDisable(true);

        currentPositionProperty.addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
                Platform.runLater(new Runnable() {
                    @Override
                    public void run() {
                        table.scrollTo(newValue.intValue());
                        table.getSelectionModel().select(newValue.intValue());
                    }
                });
            }
        });

        primaryStage.addEventHandler(ScrollEventType, new EventHandler<Event>() {
            @Override
            public void handle(Event event) {
                if (event.getEventType() == ScrollEventType) {
                    currentPositionProperty.set(((ScrollEvent)event).position);
                }
            }
        });
        primaryStage.addEventHandler(StopEventType, new EventHandler<Event>() {
            @Override
            public void handle(Event event) {
                if (timer != null) {
                    timer.cancel();
                    timer = null;
                }
            }
        });

        startButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                count = 0;
                startButton.setDisable(true);
                stopButton.setDisable(false);

                if (timer == null) {
                    timer = new Timer(true);
                    timer.schedule(new TimerTask() {
                        @Override
                        public void run() {
                            count++;
                            int position = count * DELTA;
                            if (position >= COUNT) {
                                Event.fireEvent(primaryStage, new ScrollEvent(COUNT));
                                Event.fireEvent(primaryStage, new StopEvent());
                            } else {
                                Event.fireEvent(primaryStage, new ScrollEvent(position));
                            }
                        }
                    }, 0, PERIOD);
                }
            }
        });
        stopButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                startButton.setDisable(false);
                stopButton.setDisable(true);
                if (timer != null) {
                    timer.cancel();
                    timer = null;
                }
            }
        });

        HBox hbox = new HBox(20);
        hbox.setPadding(new Insets(25, 25, 25, 25));
        hbox.getChildren().addAll(startButton, stopButton);

        // Vbox
        VBox vbox = new VBox(20);
        vbox.setPadding(new Insets(25, 25, 25, 25));
        vbox.getChildren().addAll(labelHb, table, actionStatus, hbox);

        // Scene
        Scene scene = new Scene(vbox, 500, 475); // w x h
        primaryStage.setScene(scene);
        primaryStage.show();

        // Select the first row
        table.getSelectionModel().select(0);
        Book book = table.getSelectionModel().getSelectedItem();
        actionStatus.setText(book.toString());
        
    } // start()

    private class RowSelectChangeListener implements ChangeListener<Number> {
        @Override
        public void changed(ObservableValue<? extends Number> ov, 
                Number oldVal, Number newVal) {
            int ix = newVal.intValue();
            if ((ix < 0) || (ix >= data.size())) {
                    return; // invalid data
            }
            Book book = data.get(ix);
            actionStatus.setText(book.toString());  
        }
    }
    
    private ObservableList<Book> getInitialTableData() {
        List<Book> list = new ArrayList<>();
        int i = 0;
        while (i < COUNT) {
            list.add(new Book(i++, "The Thief", "Fuminori Nakamura"));
            list.add(new Book(i++, "Of Human Bondage", "Somerset Maugham"));
            list.add(new Book(i++, "The Bluest Eye", "Toni Morrison"));
            list.add(new Book(i++, "I Am Ok You Are Ok", "Thomas Harris"));
            list.add(new Book(i++, "Magnificent Obsession", "Lloyd C Douglas"));
            list.add(new Book(i++, "100 Years of Solitude", "Gabriel Garcia Marquez"));
            list.add(new Book(i++, "What the Dog Saw", "Malcolm Gladwell"));
            list.add(new Book(i++, "The Fakir", "Ruzbeh Bharucha"));
            list.add(new Book(i++, "The Hobbit", "J.R.R. Tolkien"));
            list.add(new Book(i++, "Strange Life of Ivan Osokin", "P.D. Ouspensky"));
            list.add(new Book(i++, "The Hunt for Red October", "Tom Clancy"));
            list.add(new Book(i++, "Coma", "Robin Cook"));
        }
        return FXCollections.observableList(list);
    }
}

Answer 1

The problem was resolved by using OpenJDK11 and separate OpenJFX15 instead of Zulu JDK11+JFX.