javafx8 TableView Multiselection returns one of the selected items as null - tableview

Question

TableView multi selection returns one of the selected objects as null. This doesn't happen every time but happens most of the times when i try to select two rows in the table.similar to the issue defined in this question
Best way of reproducing the issue is , try selecting two sequential rows .
FXML :
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.ProgressBar?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.control.cell.PropertyValueFactory?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.Region?>
<?import javafx.scene.layout.StackPane?>
<AnchorPane xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.test.controller.TestController">
<children>
<TableView fx:id="personsTable" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="35.0">
<placeholder>
<Label text="" />
</placeholder>
<columns>
<TableColumn text="Name">
<cellValueFactory>
<PropertyValueFactory property="name" />
</cellValueFactory>
</TableColumn>
<TableColumn text="Address">
<cellValueFactory>
<PropertyValueFactory property="address" />
</cellValueFactory>
</TableColumn>
<TableColumn text="Course">
<cellValueFactory>
<PropertyValueFactory property="course" />
</cellValueFactory>
</TableColumn>
<TableColumn text="Country">
<cellValueFactory>
<PropertyValueFactory property="country" />
</cellValueFactory>
</TableColumn>
</columns>
</TableView>
</children>
</AnchorPane>
Controller :
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;
import com.test.model.Person;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.TableView;
public class TestController implements Initializable {
#FXML
TableView<Person> personsTable = new TableView<Person>();
#Override
public void initialize(URL location, ResourceBundle resources) {
// TODO Auto-generated method stub
MenuItem combine = new MenuItem("Select");
combine.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
List<Person> selectedPersons = new ArrayList<Person>(
personsTable.getSelectionModel().getSelectedItems());
for (Person person : selectedPersons) {
System.out.println(" the object is " + person);
}
}
});
ContextMenu contextMenu = new ContextMenu();
contextMenu.getItems().add(combine);
personsTable.setContextMenu(contextMenu);
personsTable.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
personsTable.setItems(getPendingOrders());
}
public ObservableList<Person> getPendingOrders() {
ObservableList<Person> persons = FXCollections.observableArrayList();
for (int i = 0; i < 100; i++) {
Person person = new Person();
person.setName("Name" + i);
person.setAddress("Address" + i);
person.setCountry("Country" + i);
person.setCourse("Course" + i);
persons.add(person);
}
return persons;
}
}
Model :
public class Person {
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getCourse() {
return course;
}
public void setCourse(String course) {
this.course = course;
}
private String name;
private String address;
private String country;
private String course;
}

Answer 1

1: add a default cell factory to your TableView
2: override either updateItem or updateIndex
hope it helpls