JavaFX Location is required NullPointerException Netbeans

Question

So I tried building a JavaFX application but I get a NullPointerException "Location is required". I already found a couple of questions regarding this but none of the answers worked for me.

I already tried:

Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("FXMLDocument.fxml"));

Parent root = FXMLLoader.load(getClass().getResource("/FXMLDocument.fxml"));

And moving FXMLDocument.fxml to default package but none of this worked for me. This is the untouched JavaFX FXML Application created by Netbeans, I really don't understand why this doesn't work out of the box...

Thanks in advance!

Project/File Structure:

Test.java:

package test;

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

/**
 *
 * @author Tim
 */
public class Test extends Application {

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

        Scene scene = new Scene(root);

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

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

FXMLDocument.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="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" fx:controller="test.FXMLDocumentController">
    <children>
        <Button layoutX="126" layoutY="90" text="Click Me!" onAction="#handleButtonAction" fx:id="button" />
        <Label layoutX="126" layoutY="120" minHeight="16" minWidth="69" fx:id="label" />
    </children>
</AnchorPane>

FXMLDocumentController.java:

package test;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;

/**
 *
 * @author Tim
 */
public class FXMLDocumentController implements Initializable {

    @FXML
    private Label label;

    @FXML
    private void handleButtonAction(ActionEvent event) {
        System.out.println("You clicked me!");
        label.setText("Hello World!");
    }

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

}

Stacktrace:

Exception in Application start method
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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    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.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$156(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
    at test.Test.start(Test.java:22)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$163(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$176(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
    ... 1 more
Exception running application test.Test

You should be looking at what getResource returns, it's probably not anything sensible because your fxml is not where your .class file is, by the looks of it — pvg, Dec 01 '15 at 19:43
Do you try to create from scratch your workspace in another project ? Because I copy/paste all your file and it seems to work with Netbean 8.0.2. — Aurelien, Dec 01 '15 at 19:49
For some reason, the controller class has not been compiled, and the FXML file has not been deployed. Try cleaning and rebuilding the project. — James_D, Dec 01 '15 at 19:54
I confirmed what @James_D said in my project I can see fxml and class files inside test/build/classes. — Aurelien, Dec 01 '15 at 19:57
Thanks for the help so far, I tried debugging and it looks like getResource() returns null.. but I don't know why.. I created the project from scratch, it's the netbeans FXML Application template.. I tested it on my computer with Netbeans 8.0.2, 8.1 and on my laptop with 8.0.2 - the error stays the same — Tim, Dec 01 '15 at 21:26

score 1 · Answer 1 · answered Dec 01 '15 at 21:33

1

@James_D was right, the project needed to be cleaned and rebuilt (Shift+F11) (even though I don't know why since I created the project from scratch via the Netbeans FXML Application template..)

answered Dec 01 '15 at 21:33

Tim

123
1
3
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score 0 · Answer 2 · edited Nov 20 '16 at 03:44

0

If the method doesn't work at all you have to Clean and build your project. That's worked for me

edited Nov 20 '16 at 03:44

K Scandrett

16,390
4
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65

answered Nov 19 '16 at 13:58

Henry

19
3

score 0 · Answer 3 · answered Oct 20 '17 at 07:32

I had the same problem and could solve it. My answer is here JavaFX NullPointerException Location is required NetBeans . In netbeans 8.2 in the project properties under Build > Deployment there is a check-box "Request unrestricted access (Enable signing)".

JavaFX Location is required NullPointerException Netbeans

3 Answers3