Issues adding a Custom FXML object to another

Issues adding a Custom FXML object to another - java

Introduction:
This is simply a "Table" where cards can be "placed" on, by right clicking on the table.
I have 2 FXML objects:
Card
UI
Problem:
In short, a Card needs to be added to the UI "Table", this is where my problem lies.
The adding Card method simply adds the card to a Pane object (which is not null), and we know that Pane's add objects which extend a Node
I tried 2 solutions, of which both failed.
Solution 1
Using the FXMLLoader to load the Card.fxml file into a Card object:
Having the Card definition as follows
public class Card implements Initializable
causes issues:
FXMLLoader loader = new FXMLLoader(getClass().getResource("/Layouts/Card.fxml"));
Card card = loader.load();
card.setLayoutX(mouseEvent.getSceneX() - (card.getLayoutX() / 2)); <--------here setLayoutX
card.setLayoutY(mouseEvent.getSceneY() - (card.getLayoutY() / 2)); <--------here setLayoutY
card.isFaceDown.addListener((observable, oldValue, newValue) -> {
if (newValue) {
facedownCount.add(1);
} else {
facedownCount.subtract(1);
}
});
totalCount.add(1);
gamePane.getChildren().add(card); <--------here card does not extend Node
The issue is I am unable to set layout properties of the Card object if it doesn't extend a stackpane, and also I am unable to add it to another object as a child
Solution 2: (more likely to be correct)
Changing the Card definition to
public class Card extends StackPane implements Initializable
followed by attempting to add it:
FXMLLoader loader = new FXMLLoader(getClass().getResource("/Layouts/Card.fxml"));
Card card = loader.load(); < -------- PROBLEM
which gives me this exception error:
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
... 29 more
Caused by: java.lang.ClassCastException: javafx.scene.layout.StackPane cannot be cast to Game.Controller.Card
at Game.Controller.UI.HandleClick(UI.java:60)
... 39 more
Card.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.StackPane?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.effect.DropShadow?>
<StackPane maxHeight="-Infinity"
maxWidth="-Infinity"
minHeight="-Infinity"
minWidth="-Infinity"
prefHeight="400.0"
prefWidth="600.0"
xmlns="http://javafx.com/javafx/8.0.112"
fx:controller="Game.Controller.Card"
xmlns:fx="http://javafx.com/fxml/1">
<children>
<ImageView fx:id="imgSuit" fitHeight="275.0" fitWidth="183.0" layoutX="10.0" layoutY="10.0" pickOnBounds="true" preserveRatio="true" />
<ImageView fx:id="imgValue" fitHeight="275.0" fitWidth="183.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="#../suits/back.png" />
</image>
</ImageView>
</children>
<effect>
<DropShadow />
</effect>
</StackPane>
Card Controller
public class Card implements Initializable {
public static HashMap cardSuit, cardValue;
public BooleanProperty isFaceDown = new SimpleBooleanProperty(true);
private IntegerProperty value = new SimpleIntegerProperty(-1);
public StringProperty suit = new SimpleStringProperty("");
public ImageView imgValue = new ImageView();
public ImageView imgSuit = new ImageView();
public Card(){
super();
}
#Override
public void initialize(URL location, ResourceBundle resources) {
initImages();
setupBindings();
setDefaults();
}
private void setDefaults() {
isFaceDown.set(true);
}
private void setupBindings() {
isFaceDown.addListener((observable, oldValue, newValue) -> {
if (newValue){
imgValue.setImage(null);
imgSuit.setImage((Image) cardSuit.get("B"));
}
else {
imgValue.setImage((Image) cardValue.get(value.get()));
imgSuit.setImage((Image) cardSuit.get(suit.get()));
}
});
}
private void initImages() {
if (cardSuit == null) {
cardSuit = new HashMap<String, Image>();
cardSuit.put("B", new Image("/suits/back.png"));
cardSuit.put("C", new Image("/suits/clubs.png"));
cardSuit.put("D", new Image("/suits/diamonds.png"));
cardSuit.put("S", new Image("/suits/spades.png"));
cardSuit.put("H", new Image("/suits/hearts.png"));
}
if (cardValue == null) {
cardValue = new HashMap<Integer, Image>();
for (int i = 1; i <= 13; i++) {
cardValue.put(i, new Image("/values/" + String.valueOf(i) + ".png"));
}
}
}
}
UI fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Menu?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.StackPane?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" onMousePressed="#HandleClick" prefHeight="750.0" prefWidth="702.0" xmlns="http://javafx.com/javafx/8.0.112" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Game.Controller.UI">
<children>
<MenuBar prefHeight="29.0" prefWidth="700.0">
<menus>
<Menu mnemonicParsing="false" text="Menu">
<items>
<MenuItem fx:id="mmReset" mnemonicParsing="false" text="Reset" />
<MenuItem fx:id="mmClose" mnemonicParsing="false" onAction="#CloseApp" text="Close" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Help">
<items>
<MenuItem fx:id="mmAbout" mnemonicParsing="false" text="About" />
</items>
</Menu>
<Menu fx:id="mInstruct" mnemonicParsing="false" text="Instructions" />
</menus>
</MenuBar>
<StackPane fx:id="gamePane" layoutX="1.0" layoutY="29.0" prefHeight="700.0" prefWidth="700.0" style="-fx-background-color: green;" />
<HBox layoutX="7.0" layoutY="731.0" prefHeight="15.0" prefWidth="693.0">
<children>
<Label fx:id="lblHearts" text="Hearts = " />
<Label fx:id="lblDiamonds" text="Diamonds = " />
<Label fx:id="lblSpades" text="Spades = " />
<Label fx:id="lblClubs" text="Clubs = " />
<Label fx:id="lblFaceUp" text="Facing Up =" />
</children>
</HBox>
</children>
</AnchorPane>
What am I doing wrong, I think that solution #2 is more 'correct', but why doesn't the loader allow loading into the Card, with the StackPane cast exception
p.s. As a sub question, what difference does the root node make in this case, when loading the fxml object, will it allow me to e.g. setlayoutX property if I don't explicitly extends StackPane in the definition?

You could create a custom component that extends StackPane and is used as the controller class controller by using the <fx:root> element
public class Card extends StackPane implements Initializable {
public Card() {
FXMLLoader loader = new FXMLLoader(getClass().getResouce("card.fxml"));
loader.setRoot(this);
loader.setController(this);
try {
loader.load();
} catch (Exception e) {
throw new IllegalStateException("Could not load fxml", e);
}
}
...
}
card.fxml
<fx:root type="javafx.scene.layout.StackPane"
maxHeight="-Infinity"
maxWidth="-Infinity"
minHeight="-Infinity"
minWidth="-Infinity"
prefHeight="400.0"
prefWidth="600.0"
xmlns="http://javafx.com/javafx/8.0.112"
xmlns:fx="http://javafx.com/fxml/1">
<children>
<ImageView fx:id="imgSuit" fitHeight="275.0" fitWidth="183.0" layoutX="10.0" layoutY="10.0" pickOnBounds="true" preserveRatio="true" />
<ImageView fx:id="imgValue" fitHeight="275.0" fitWidth="183.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="#../suits/back.png" />
</image>
</ImageView>
</children>
<effect>
<DropShadow />
</effect>
</fx:root>

Related

Can't pass attribute betwewen scenes JAvaFX

I'm trying to pass a String between scenes in JavaFX, I already followed the some answers but it seems that they don't work because the string is null in the new scene.
Here's my MainControler:
public class FXMLDocumentController implements Initializable {
#FXML
private Button btn_signup;
#FXML
private TextField et_username;
#FXML
private PasswordField et_password;
#FXML
private Hyperlink link_login;
Stage prevStage;
public void setPrevStage(Stage stage){
this.prevStage = stage;
}
#FXML
private void handleButtonAction(ActionEvent event) throws IOException {
if(btn_signup == event.getSource()){
Conector conn = new Conector();
if (conn.checkUser(et_username.getText(), et_password.getText())) {
FXMLLoader myLoader = new FXMLLoader(getClass().getResource("FXMLTasker.fxml"));
Pane myPane = (Pane)myLoader.load();
Scene scene = new Scene(myPane);
Stage stage = new Stage();
stage.setResizable(false);
stage.setScene(scene);
FXMLTaskerController controler = new FXMLTaskerController();
controler.setUser(et_username.getText());
myLoader.setController(controler);
prevStage.close();
stage.show();
}else {
JOptionPane.showMessageDialog(null, "Usuario o Contraseña incorrecta");
}
}else if (link_login == event.getSource()){
System.out.println("Registrate!");
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
}
Here's the other class controler, the one where i want my String.
public class FXMLTaskerController implements Initializable {
#FXML private ListView list_todo;
#FXML private ListView list_done;
#FXML public String username;
private void handleButtonAction(ActionEvent event) {
}
#Override
public void initialize(URL url, ResourceBundle rb) {
System.out.println(username);
list_todo.setCellFactory(new TaskCellFactory());
list_done.setCellFactory(new TaskCellFactory());
try {
getTasks();
} catch (IOException ex) {
Logger.getLogger(FXMLTaskerController.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void setUser(String username){
this.username = username;
}
public void getTasks() throws IOException{
Conector con = new Conector();
for(Task task: con.obtenerTareas("pepin")){
System.out.println(task);
if(task.isState()){
list_done.getItems().add(task);
}else{
list_todo.getItems().add(task);
}
}
}
}
And here are the fxml files:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Hyperlink?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.PasswordField?>
<?import javafx.scene.control.Separator?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane prefHeight="400.0" prefWidth="500.0" style="-fx-background-color: #0288D1; -fx-border-color: #01579B; -fx-border-width: 5;" xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="desktop_tasker.FXMLDocumentController">
<children>
<Label layoutX="215.0" layoutY="34.0" text="Sign In" textFill="WHITE">
<font>
<Font size="23.0" />
</font>
</Label>
<Hyperlink fx:id="link_login" layoutX="150.0" layoutY="269.0" onAction="#handleButtonAction" text="Not registered yet? Click here." textFill="WHITE" />
<TextField fx:id="et_username" layoutX="21.0" layoutY="102.0" prefHeight="25.0" prefWidth="425.0" promptText="Username" style="-fx-prompt-text-fill: #ffffff; -fx-background-color: #0288D1;" />
<Separator layoutX="27.0" layoutY="126.0" prefHeight="3.0" prefWidth="425.0" />
<Separator layoutX="27.0" layoutY="192.0" prefHeight="3.0" prefWidth="425.0" />
<Button fx:id="btn_signup" layoutX="27.0" layoutY="222.0" mnemonicParsing="false" onAction="#handleButtonAction" prefHeight="23.0" prefWidth="425.0" style="-fx-background-color: #FFA000; -fx-prompt-text-fill: #ffffff;" text="SignUp" textFill="WHITE" />
<PasswordField fx:id="et_password" layoutX="21.0" layoutY="167.0" prefHeight="25.0" prefWidth="425.0" promptText="Password" style="-fx-background-color: #0288D1; -fx-prompt-text-fill: #ffffff;" />
</children>
</AnchorPane>
And the other one:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.control.Menu?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.control.SplitPane?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="557.0" prefWidth="1012.0" style="-fx-background-color: #0288D1;" xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="desktop_tasker.FXMLTaskerController">
<children>
<SplitPane dividerPositions="0.5811881188118811" layoutX="-8.0" layoutY="35.0" prefHeight="529.0" prefWidth="1027.0" style="-fx-background-color: #EEEEEE;" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="28.0">
<items>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
<children>
<ListView fx:id="list_todo" layoutY="-8.0" prefHeight="527.0" prefWidth="584.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0" />
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
<children>
<ListView fx:id="list_done" layoutY="14.0" prefHeight="527.0" prefWidth="420.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0" />
</children></AnchorPane>
</items>
</SplitPane>
<MenuBar prefHeight="30.0" prefWidth="1012.0">
<menus>
<Menu mnemonicParsing="false" text="File">
<items>
<MenuItem mnemonicParsing="false" text="Close" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Edit">
<items>
<MenuItem mnemonicParsing="false" text="Delete" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Help">
<items>
<MenuItem mnemonicParsing="false" text="About" />
</items>
</Menu>
</menus>
</MenuBar>
</children>
</AnchorPane>
As you can see I tried to use a controler and using a set pasing the String, the problem is that when I open the new scene, his controler resets and the String is no longer there, any idea why or how to solve this?

If you want to set a Controller with myLoader.setController(controler); you must do it before calling Pane myPane = (Pane)myLoader.load(); and also remove fx:controller="desktop_tasker.FXMLTaskerController" from FXMLTasker.fxml, else you get a LoadException: Controller value already specified.
See JavaDoc FXMLLoader.setController(Object controller):
Sets the controller associated with the root object. The value passed to this method is used as the value of the fx:controller attribute. This method must be called prior to loading the document when using controller event handlers when an fx:controller attribute is not specified in the document.
Alternatively you can request the Controller from FXMLLoader:
FXMLTaskerController controler = (FXMLTaskerController)myLoader.getController();
controler.setUser(et_username.getText());
But thereby you can't assume that username is set in initialize(URL url, ResourceBundle rb) and should removed from there.

JavaFX Starter: Modifying Label Text on other window from Main Window

I'm a new javaFx with Scenebuilder and MVC starter.
I have a problem as below:
I tried to make a main window to alert a new window. And I tried to midified the label text in that alert window. But I cannot do that. And I got this error:
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8411)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:352)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$355(GlassViewEventHandler.java:388)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
... 48 more
Caused by: java.lang.NullPointerException
at controller.AlertController.setAlertLabel(AlertController.java:36)
at controller.MainController.onMainButtonClicked(MainController.java:24)
... 58 more
I have a main window with maincontroller, alertController and main.fxml and alert.fxml as below:
Main:
package app;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("../view/Main.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Main Controller:
package controller;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
public class MainController {
AlertController alertController = new AlertController();
#FXML
public Label mainLabel;
#FXML
public TextField mainTextField;
#FXML
public Button mainButton;
#FXML
public void onMainButtonClicked() {
alertController.displayAlert();
alertController.setAlertLabel("Hello from MainController!");
}
}
Main.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.MainController">
<children>
<VBox prefHeight="400.0" prefWidth="600.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<HBox alignment="CENTER" prefHeight="154.0" prefWidth="600.0">
<children>
<Label fx:id="mainLabel" alignment="CENTER" contentDisplay="TOP" prefHeight="31.0" prefWidth="115.0" text="Main Text" />
</children>
</HBox>
<HBox alignment="CENTER" centerShape="false" layoutX="10.0" layoutY="10.0">
<children>
<TextField fx:id="mainTextField" alignment="TOP_LEFT" prefHeight="25.0" prefWidth="331.0" />
</children>
</HBox>
<HBox alignment="CENTER" layoutX="10.0" layoutY="10.0" prefHeight="100.0" prefWidth="200.0">
<children>
<Button fx:id="mainButton" mnemonicParsing="false" onAction="#onMainButtonClicked" text="Display Alert && Set Message Text" />
</children>
</HBox>
</children>
</VBox>
</children>
</AnchorPane>
AlertController:
package controller;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.stage.Stage;
import java.io.IOException;
public class AlertController {
Stage window;
#FXML
public Label alertLabel;
#FXML
Button alertButton;
public void displayAlert() {
try {
window = new Stage();
Parent root = FXMLLoader.load(getClass().getResource("../view/Alert.fxml"));
Scene scene = new Scene(root);
window.setScene(scene);
window.setTitle("Alert");
window.show();
} catch (IOException e) {
e.printStackTrace();
}
}
public void setAlertLabel(String str) {
alertLabel.setText(str);
}
#FXML
public void onAlertButtonClicked() {
window.close();
}
}
And Alert.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="210.0" prefWidth="380.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.AlertController">
<children>
<VBox prefHeight="210.0" prefWidth="380.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<HBox alignment="BOTTOM_CENTER" prefHeight="100.0" prefWidth="200.0">
<children>
<Label fx:id="alertLabel" text="Alert Message" />
</children>
</HBox>
<HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0">
<children>
<Button fx:id="alertButton" mnemonicParsing="false" onAction="#onAlertButtonClicked" text="Close" />
</children>
</HBox>
</children>
</VBox>
</children>
</AnchorPane>
Please kindly help me solve this problems and explain me why this doesn't work. Thank you for you suggestions.

There are two instances of AlertController: the one you create in MainController with
AlertController alertController = new AlertController();
and the one that is created by the FXMLLoader when you load Alert.fxml in displayAlert().
The #FXML-annotated fields are initialized by the FXMLLoader on the instance it creates. However, you are calling setAlertLabel(...) on an instance of AlertController that was not created by the FXMLLoader. So when you call
alertController.setAlertLabel("Hello from MainController!");
the alertLabel belonging to alertController has not been initialized, and you get a null pointer exception.
Simple Solution
The easiest fix is to load Alert.fxml in MainController, and retrieve the correct controller instance:
public class MainController {
#FXML
public Label mainLabel;
#FXML
public TextField mainTextField;
#FXML
public Button mainButton;
#FXML
public void onMainButtonClicked() {
FXMLLoader loader = new FXMLLoader(getClass().getResource("../view/Alert.fxml"));
Parent root = loader.load();
AlertController alertController = loader.getController();
alertController.setAlertLabel("Hello from MainController!");
Scene scene = new Scene(root);
window.setScene(scene);
window.setTitle("Alert");
window.show();
}
}
and remove the displayAlert() method from AlertController.
Custom Component Solution
An alternative, which is structurally a bit closer to your original, is to replace the AlertController with a custom component.
Alert.fxml (note the change to the root element, and that fx:controller has been removed):
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<fx:root type="AnchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="210.0" prefWidth="380.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" >
<children>
<VBox prefHeight="210.0" prefWidth="380.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<HBox alignment="BOTTOM_CENTER" prefHeight="100.0" prefWidth="200.0">
<children>
<Label fx:id="alertLabel" text="Alert Message" />
</children>
</HBox>
<HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0">
<children>
<Button fx:id="alertButton" mnemonicParsing="false" onAction="#onAlertButtonClicked" text="Close" />
</children>
</HBox>
</children>
</VBox>
</children>
</fx:root>
AlertController.java:
package controller;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.stage.Stage;
import java.io.IOException;
public class AlertController extends AnchorPane {
Stage window;
#FXML
public Label alertLabel;
#FXML
Button alertButton;
public AlertController() {
window = new Stage();
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("../view/Alert.fxml"));
loader.setController(this);
loader.setRoot(this);
loader.load();
Scene scene = new Scene(this);
window.setScene(scene);
window.setTitle("Alert");
} catch (IOException e) {
e.printStackTrace();
}
}
public void displayAlert() {
window.show();
}
public void setAlertLabel(String str) {
alertLabel.setText(str);
}
#FXML
public void onAlertButtonClicked() {
window.close();
}
}
and now your main controller can look like this:
package controller;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
public class MainController {
AlertController alertController = new AlertController();
#FXML
public Label mainLabel;
#FXML
public TextField mainTextField;
#FXML
public Button mainButton;
#FXML
public void onMainButtonClicked() {
alertController.displayAlert();
alertController.setAlertLabel("Hello from MainController!");
}
}

javaFX getting null pointer while initiating controller

I am getting a null pointer exception while initializing a table.
This line controller.setUserDetailsList(userDetailsList) is throwing the error
even though I am adding data in userDetailsList.
Any Idea how to resolve this? Thanks..
public class Main extends Application {
private Stage primaryStage;
private ObservableList<UserDetails> userDetailsList = FXCollections.observableArrayList();
public Main() {
// Add some sample data
userDetailsList.add(new UserDetails("Hans"));
}
#Override
public void start(Stage primaryStage) {
this.primaryStage = primaryStage;
primaryStage.show();
primaryStage.setTitle("ICA");
loadMainViewPage();
}
private void loadMainViewPage(){
try{
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("MainView.fxml"));
BorderPane mainView = (BorderPane) loader.load();
Scene scene = new Scene(mainView);
primaryStage.setScene(scene);
MainViewController controller = loader.getController();
controller.setUserDetailsList(userDetailsList);
}catch(Exception e) {
e.printStackTrace();
}
}
public ObservableList<UserDetails> getUserDetailsList() {
return userDetailsList;
}
public static void main(String[] args) {
launch(args);
}
}
Controller Class looks like this:
public class MainViewController {
#FXML
private TableView<UserDetails> userTable;
#FXML
private TableColumn<UserDetails,String> userNameColumn;
private Main main;
#FXML
private void initialize() {
System.out.println("inside initialize");
userNameColumn.setCellValueFactory(cellData -> cellData.getValue().HostNameProperty());
}
public void setUserDetailsList(ObservableList<UserDetails> userDetailsList) {
userTable.setItems(userDetailsList);
}
}
FXML file
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Menu?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.control.SplitPane?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.MainViewController">
<top>
<MenuBar BorderPane.alignment="CENTER">
<menus>
<Menu mnemonicParsing="false" text="File">
<items>
<MenuItem mnemonicParsing="false" text="Close" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Edit">
<items>
<MenuItem mnemonicParsing="false" text="Delete" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Help">
<items>
<MenuItem mnemonicParsing="false" text="About" />
</items>
</Menu>
</menus>
</MenuBar>
</top>
<center>
<AnchorPane>
<children>
<SplitPane dividerPositions="0.362876254180602" prefHeight="375.0" prefWidth="600.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<items>
<TableView fx:id="userTable">
<columns>
<TableColumn fx:id="userNameColumn" prefWidth="75.0" text="C1" />
</columns>
<columnResizePolicy>
<TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
</columnResizePolicy>
</TableView>
<TextArea />
</items>
</SplitPane>
</children>
</AnchorPane>
</center>
</BorderPane>
Error:
java.lang.NullPointerException
at application.Main.loadMainViewPage(Main.java:48)
at application.Main.start(Main.java:30)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(Unknown Source)
at java.lang.Thread.run(Unknown Source)

JavaFX open new window issue with fxml

I'm developing a password manager program. When opening a new window in this program it throws an exception on the addEntry() mouse click event. I have a Main class that opens the main window (with sample.fxml) and a Controller class that manages to open the new window (with addNewEntryDialog.fxml). Here's my code:
Main.java
package sample;
import javafx.application.Application;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Modality;
import javafx.stage.Stage;
import java.io.IOException;
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("/sample.fxml"));
primaryStage.setTitle("Password Manager");
primaryStage.setScene(new Scene(root, 800, 600));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Controller.java
package sample;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import java.io.IOException;
import java.net.URL;
import java.sql.*;
import java.util.ResourceBundle;
public class Controller implements Initializable {
public ObservableList<Data> data;
public TableView dbTable;
public TableColumn siteColumn, usernameColumn, passwordColumn;
public ToggleButton showPasswordToggle;
#Override
public void initialize(URL location, ResourceBundle resources) {
fillTable();
}
public void fillTable(){
data = FXCollections.observableArrayList();
String query = "SELECT * FROM accounts";
try {
Connection connection = connectToDatabase();
ResultSet resultSet = connection.createStatement().executeQuery(query);
while (resultSet.next()) {
data.add(new Data(resultSet.getString(1), resultSet.getString(2), resultSet.getString(3)));
}
siteColumn.setCellValueFactory(new PropertyValueFactory("site"));
usernameColumn.setCellValueFactory(new PropertyValueFactory("username"));
passwordColumn.setCellValueFactory(new PropertyValueFactory("password"));
dbTable.setItems(data);
} catch (SQLException e) {
e.printStackTrace();
}
}
#FXML
public void addEntry() throws IOException {
Stage stage = new Stage();
Parent root = FXMLLoader.load(getClass().getResource("/addEntryDialog.fxml"));
stage.setTitle("Add new entry");
stage.setScene(new Scene(root, 800, 600));
stage.show();
}
addEntryDialog.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="200.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<GridPane layoutX="28.0" layoutY="21.0" prefHeight="123.0" prefWidth="317.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Label layoutX="33.0" layoutY="26.0" text="Site:" />
<Label layoutX="28.0" layoutY="78.0" text="Username:" GridPane.rowIndex="1" />
<Label layoutX="44.0" layoutY="135.0" text="Password:" GridPane.rowIndex="2" />
<TextField fx:id="siteField" layoutX="150.0" layoutY="21.0" GridPane.columnIndex="1" />
<TextField fx:id="usernameField" layoutX="150.0" layoutY="73.0" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<PasswordField fx:id="passwordField" layoutX="150.0" layoutY="123.0" GridPane.columnIndex="1" GridPane.rowIndex="2" />
</children>
</GridPane>
<Button layoutX="327.0" layoutY="163.0" mnemonicParsing="false" text="OK" />
<Button layoutX="246.0" layoutY="163.0" mnemonicParsing="false" text="Cancel" />
</children>
</Pane>
sample.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<Pane prefHeight="600.0" prefWidth="800.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<TableView fx:id="dbTable" layoutX="4.0" layoutY="85.0" prefHeight="505.0" prefWidth="790.0">
<columns>
<TableColumn fx:id="siteColumn" prefWidth="263.0" text="Site" />
<TableColumn fx:id="usernameColumn" prefWidth="263.0" text="Username" />
<TableColumn fx:id="passwordColumn" prefWidth="263.0" text="Password" />
</columns>
</TableView>
<GridPane layoutX="14.0" layoutY="27.0" prefHeight="25.0" prefWidth="263.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button fx:id="addNewEntry" layoutX="14.0" layoutY="14.0" mnemonicParsing="false" onMouseClicked="#addEntry" text="Add.." GridPane.columnIndex="0" />
<Button fx:id="removeEntry" layoutX="83.0" layoutY="14.0" mnemonicParsing="false" text="Remove.." GridPane.columnIndex="1" />
<Button fx:id="editEntry" layoutX="178.0" layoutY="14.0" mnemonicParsing="false" text="Edit.." GridPane.columnIndex="2" />
</children>
</GridPane>
<ToggleButton fx:id="showPasswordToggle" layoutX="671.0" layoutY="27.0" mnemonicParsing="false" text="Show Password" />
</children>
</Pane>
STACK TRACE
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:352)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:388)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
... 31 more
Caused by: javafx.fxml.LoadException:
/home/umberto/passwordManager/out/production/passwordManager/addEntryDialog.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at sample.Controller.addEntry(Controller.java:58)
... 41 more
Caused by: java.lang.NullPointerException
at sample.Controller.loadTableData(Controller.java:45)
at sample.Controller.initialize(Controller.java:30)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 49 more

Look at your addEntryDialog.fxml file. There is definition of this view's controller:
<Pane ... fx:controller="sample.Controller>
JavaFX loads the view, looks for the controller and creates it. (At this moment another sample.Controller object is instantiated). After creating it sees that this controller implements Initializable interface, so it executes initialize method which in turn calls fillTable method and finally the statement siteColumn.setCellValueFactory(..) is reached. The problem is that there's no siteColumn for addEntryDialog.fxml view - it has not been binded since there's no element on view with that id.
Solution is to create proper controller for addEntryView.fxml and call it in xml fx:controller attribute.

Loader instantiation throws nullpointer in JavaFX

I have declared two fxml files and a controller for each one:
rootlayoutcontroller is a controller for rootlayout.fxml
and
overviewcontroller is a controller for overview.fxml
rootlayout has menu bar with file open item, and overviewcontroller has a Draw button.
I have another class called DataStructure. I want to open a file and send the path to overviewcontroller. Then when I click Draw the constructor of DartaStructure shall get instantiated, with the path as parameter. But as soon as I click open, on file chooser open dialog, the program throws an nullpointer for in handleOpen() method.
Sometimes I get Source not found!
In a main class I wrap overview in rootlayout and show the stage.
RootLayoutController:
public class RootLayoutController {
private final Model model;
public RootLayoutController(Model model){
this.model = model;
}
/**
* Opens a FileChooser to let the user select a .z3lgm file to load.
*/
#FXML
private void handleOpen() {
FileChooser fileChooser = new FileChooser();
// Set extension filter
FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter(
"3lgm2 files (*.z3lgm)", "*z3lgm");
fileChooser.getExtensionFilters().add(extFilter);
// Show open file dialog
File file = fileChooser.showOpenDialog(main.getPrimaryStage());
if (file != null) {
path = file.toString();
model.setText(path);//error
}
}
}
OverViewController:
public class OverViewController implements Initializable {
private final Model model;
public OverViewController(Model model){
this.model = model;
}
public void treeTableDraw(ActionEvent event) {
String p = model.getText();
new Controller(p);
drawTable();
numberOfFunctions = dc.getFuncAll().size();
numberOfOrganizations = dc.getSortedAssignedOrg().size();
funcLabel.setText(numberOfFunctions + "");
orgLabel.setText(numberOfOrganizations + "");
btnDraw.setDisable(true);
}
}
Error stack:
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1770)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1653)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.control.MenuItem.fire(MenuItem.java:462)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.doSelect(ContextMenuContent.java:1405)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.lambda$createChildren$341(ContextMenuContent.java:1358)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer$$Lambda$326/15872584.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3758)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3486)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2495)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:350)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$350(GlassViewEventHandler.java:385)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$209/5704663.get(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:404)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:384)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:927)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$48(GtkApplication.java:139)
at com.sun.glass.ui.gtk.GtkApplication$$Lambda$41/19140780.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1767)
... 46 more
Caused by: java.lang.NullPointerException
at view.RootLayoutController.handleOpen(RootLayoutController.java:174)
... 56 more
Main Class:
public class Main extends Application {
private Stage primaryStage;
private BorderPane rootLayout;
private Model model = new Model;
// private ObservableList<DataConstructor> treeTableData =
// FXCollections.observableArrayList();
#Override
public void start(Stage primaryStage) {
this.primaryStage = primaryStage;
this.primaryStage.setTitle("IT-Saturation");
initRootLayout();
showOverView();
}
private void showOverView() {
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("/view/OverView.fxml"));
loader.setController(new OverViewController(model));
// Parent firstUI = loader.load();
AnchorPane overView = (AnchorPane) loader.load();
rootLayout.setCenter(overView);
// OverViewController controller = loader.getController();
// controller.setMainApp(this);
} catch (IOException e) {
e.printStackTrace();
}
}
private void initRootLayout() {
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("/view/RootLayout.fxml"));
loader.setController(new RootLayoutController(model));
rootLayout = (BorderPane) loader.load();
// show scene containing the root layout
Scene scene = new Scene(rootLayout);
scene.getStylesheets().add(
getClass().getResource("application.css").toExternalForm());
primaryStage.setScene(scene);
// gives controller access to main
RootLayoutController controller = loader.getController();
controller.setMainApp(this);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Returns the main stage.
*
* #return primaryStage
*/
public Stage getPrimaryStage() {
return primaryStage;
}
public static void main(String[] args) {
launch(args);
}
public void showMostComputerizedStatistics() {
try {
// Load the fxml file and create a new stage for the popup.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class
.getResource("view/BirthdayStatistics.fxml"));
AnchorPane page = (AnchorPane) loader.load();
Stage dialogStage = new Stage();
dialogStage.setTitle("Birthday Statistics");
dialogStage.initModality(Modality.WINDOW_MODAL);
dialogStage.initOwner(primaryStage);
Scene scene = new Scene(page);
dialogStage.setScene(scene);
// Set the persons into the controller.
MostComputerizedController controller = loader.getController();
dialogStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
}
This is RootLayout fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.input.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.BorderPane?>
<BorderPane prefHeight="500.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" >
<top>
<MenuBar BorderPane.alignment="CENTER">
<menus>
<Menu text="_File">
<items>
<MenuItem onAction="#handleOpen" text="_Open" />
<MenuItem mnemonicParsing="false" onAction="#handleExportPic" text="Export as picture" />
<MenuItem mnemonicParsing="false" text=" Save as" />
<MenuItem mnemonicParsing="false" onAction="#doPrint" text="Print" />
<MenuItem onAction="#handleExit" text="E_xit">
<accelerator>
<KeyCodeCombination alt="UP" code="X" control="DOWN" meta="UP" shift="UP" shortcut="UP" />
</accelerator></MenuItem>
</items>
</Menu>
<Menu mnemonicParsing="false" onAction="#handleMostComputerizedStatistics" text="Statistics">
<items>
<MenuItem mnemonicParsing="false" onAction="#handleMostComputerizedStatistics" text="Show Statistics" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Help">
<items>
<MenuItem mnemonicParsing="false" text="About" />
</items>
</Menu>
</menus>
</MenuBar>
</top>
</BorderPane>
And this is overview fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.text.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" >
<children>
<SplitPane dividerPositions="0.2391304347826087" layoutX="62.0" layoutY="52.0" prefHeight="400.0" prefWidth="600.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<items>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0" SplitPane.resizableWithParent="false">
<children>
<Button fx:id="btnDraw" layoutX="24.0" layoutY="297.0" mnemonicParsing="false" onAction="#treeTableDraw" text="Draw" AnchorPane.leftAnchor="22.0" AnchorPane.rightAnchor="36.0" />
<Label fx:id="funcLabel" layoutX="24.0" layoutY="155.0" opacity="0.72" prefHeight="15.0" prefWidth="38.0" text="0" AnchorPane.bottomAnchor="190.0" AnchorPane.leftAnchor="24.0" AnchorPane.rightAnchor="77.0">
<font>
<Font size="10.0" />
</font></Label>
<Label fx:id="orgLabel" layoutX="17.0" layoutY="219.0" opacity="0.72" prefHeight="14.0" prefWidth="38.0" text="0" AnchorPane.bottomAnchor="165.0" AnchorPane.leftAnchor="24.0" AnchorPane.rightAnchor="84.0" AnchorPane.topAnchor="219.0">
<font>
<Font size="10.0" />
</font></Label>
<Label layoutX="63.0" layoutY="155.0" text="Functions" AnchorPane.bottomAnchor="190.0">
<font>
<Font size="11.0" />
</font>
</Label>
<Label layoutX="56.0" layoutY="219.0" text="Organizations" AnchorPane.bottomAnchor="165.0" AnchorPane.topAnchor="213.0">
<font>
<Font size="10.0" />
</font>
</Label>
<Button fx:id="btnReset" layoutX="21.0" layoutY="345.0" mnemonicParsing="false" onAction="#treeTableReset" onKeyPressed="#treeTableReset" prefHeight="25.0" prefWidth="81.0" text="Reset" AnchorPane.leftAnchor="22.0" AnchorPane.rightAnchor="36.0" />
</children></AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0" SplitPane.resizableWithParent="false">
<children>
<ScrollPane fx:id="scrollPane" prefHeight="398.0" prefWidth="480.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<content>
<TreeTableView fx:id="treeTable" editable="true" prefHeight="375.0" prefWidth="246.0" />
</content>
</ScrollPane>
</children></AnchorPane>
</items>
</SplitPane>
</children>
</AnchorPane>

FXMLLoader.getController() will return null if you call it before the load() method has been called (because if it hasn't loaded the FXML file, it doesn't know what the controller is).
But this is still not going to do what you want. You want a reference to the controller instance that is associated with the root of the FMXL file that is displayed in the UI. It doesn't help to just get an arbitrary controller instance, whether you do it by getting it from another FXMLLoader or by instantiating it directly.
The controller instance you want is the one you can get by calling loader.getController() in the showOverview() method in your Main class. If you want the controllers to communicate with each other, you need to arrange for the RootLayoutController instance to have a reference to that OverViewController instance.
It might be better not to have the controllers have direct access to each other, but to let them communicate with data in a shared data model. This question has a simple example of this approach.

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