ScrollPane.setOnScroll(...) ScrollPane.setOnScrollStarted(...) ScrollPane.setOnScrollFinished(...) will not generate events unless attempted to "overscroll" or scroll past the end.

Sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

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

<AnchorPane id="AnchorPane" prefHeight="480.0" prefWidth="640.0" xmlns:fx="http://javafx.com/fxml" fx:controller="javafxapplication7.SampleController">
  <children>
    <ScrollPane fx:id="mainScrollPane" fitToHeight="true" fitToWidth="true" minHeight="-Infinity" minWidth="-Infinity" prefHeight="480.0" prefWidth="640.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
      <content>
        <AnchorPane id="Content" minHeight="-Infinity" minWidth="-Infinity" prefHeight="1200.0" />
      </content>
    </ScrollPane>
  </children>
</AnchorPane>

SampleController.java

package javafxapplication7;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ScrollPane;

public class SampleController implements Initializable
{

private static long scrollCount = 0;
    @FXML
    private ScrollPane mainScrollPane;


    @Override
    public void initialize(URL url, ResourceBundle rb)
    {

EventHandler<Event> scrollLogging = new EventHandler<Event>() {
@Override
public void handle(Event e)
{
System.out.println("Scrolling: " + scrollCount++);
}
};

mainScrollPane.setOnScroll(scrollLogging);
mainScrollPane.setOnScrollStarted(scrollLogging);
mainScrollPane.setOnScrollFinished(scrollLogging);
    }
}

JavaFXApplication7.java

package javafxapplication7;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;


public class JavaFXApplication7 extends Application
{

    @Override
    public void start(Stage stage) throws Exception
    {
        Parent root = FXMLLoader.load(getClass().getResource("Sample.fxml"));

        Scene scene = new Scene(root);

        stage.setScene(scene);
        stage.show();
    }

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