Change selected cell in a tableview only get changed events in selectedItemProperty, if the selected cell is in another row. Change selected cell within the same row does not cause a changed event.

The code within the javafx SelectionModel want to set setSelectedIndex:68 and the IntegerProperty checks, if the values are different to call markInvalid, but changes within the same row skip this part.

Sample code shows following behaviour:
Selected cell within the same row, does not produce System.out calls.
Selected cell from different row, does produce System.out calls.

Here is my sample code:

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TablePosition;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
 
public class TableViewTest extends Application {
 
    private TableView<Person> table = new TableView<Person>();
    private final ObservableList<Person> data =
        FXCollections.observableArrayList(
            new Person("Jacob", "Smith", "jacob.smith@example.com"),
            new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
            new Person("Ethan", "Williams", "ethan.williams@example.com"),
            new Person("Emma", "Jones", "emma.jones@example.com"),
            new Person("Michael", "Brown", "michael.brown@example.com")
        );
   
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage stage) {
        Scene scene = new Scene(new Group());
        stage.setTitle("Table View Sample");
        stage.setWidth(450);
        stage.setHeight(500);
 
        final Label label = new Label("Address Book");
        label.setFont(new Font("Arial", 20));
 
        table.setEditable(true);
 
        TableColumn firstNameCol = new TableColumn("First Name");
        firstNameCol.setMinWidth(100);
        firstNameCol.setCellValueFactory(
                new PropertyValueFactory<Person, String>("firstName"));
 
        TableColumn lastNameCol = new TableColumn("Last Name");
        lastNameCol.setMinWidth(100);
        lastNameCol.setCellValueFactory(
                new PropertyValueFactory<Person, String>("lastName"));
 
        TableColumn emailCol = new TableColumn("Email");
        emailCol.setMinWidth(200);
        emailCol.setCellValueFactory(
                new PropertyValueFactory<Person, String>("email"));
 
        table.setItems(data);
        table.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
 
        table.getSelectionModel().setCellSelectionEnabled(true);
        table.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
        addTableSelectionListener(table);
        
        final VBox vbox = new VBox();
        vbox.setSpacing(5);
        vbox.setPadding(new Insets(10, 0, 0, 10));
        vbox.getChildren().addAll(label, table);
 
        ((Group) scene.getRoot()).getChildren().addAll(vbox);
 
        stage.setScene(scene);
        stage.show();
    }
 
    private void addTableSelectionListener(final TableView<Person> tableView) {

        tableView.getSelectionModel().selectedItemProperty().addListener((observableValue, oldValue, newValue) -> {
            //Check whether item is selected and set value of selected item to Label
            if (tableView.getSelectionModel().getSelectedItem() != null) {
                TableView.TableViewSelectionModel selectionModel = tableView.getSelectionModel();
                ObservableList selectedCells = selectionModel.getSelectedCells();
                TablePosition tablePosition = (TablePosition) selectedCells.get(0);
                // sets selected value into StringProperty
                System.out.println(" " + (String) tablePosition.getTableColumn().getCellData(newValue));
            }
            
        });
    }
    
    public static class Person {
 
        private final SimpleStringProperty firstName;
        private final SimpleStringProperty lastName;
        private final SimpleStringProperty email;
 
        private Person(String fName, String lName, String email) {
            this.firstName = new SimpleStringProperty(fName);
            this.lastName = new SimpleStringProperty(lName);
            this.email = new SimpleStringProperty(email);
        }
 
        public String getFirstName() {
            return firstName.get();
        }
 
        public void setFirstName(String fName) {
            firstName.set(fName);
        }
 
        public String getLastName() {
            return lastName.get();
        }
 
        public void setLastName(String fName) {
            lastName.set(fName);
        }
 
        public String getEmail() {
            return email.get();
        }
 
        public void setEmail(String fName) {
            email.set(fName);
        }
    }
}