Failed to load module "canberra-gtk-module" Error when running javafx program in netbeans on Ubuntu

Question

I am running a minimal "getting started" program with Javafx in Netbeans on Ubuntu.

My application start method is:

public class App extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("scene.fxml"));
        
        Scene scene = new Scene(root);
        scene.getStylesheets().add(getClass().getResource("styles.css").toExternalForm());
        
        stage.setTitle("JavaFX and Gradle");
        stage.setScene(scene);
        stage.show();
    }

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

}

The errors I get are

Gtk-Message: 05:42:26.590: Failed to load module "canberra-gtk-module"
Gtk-Message: 05:42:26.590: Failed to load module "canberra-gtk-module"
Exception in Application start method
java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1071)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3316)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3280)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3249)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3222)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3199)
    at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3192)
    at Experimenting.App.start(App.java:17)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:474)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:447)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:446)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
    ... 1 more
Exception running application Experimenting.App

FAILURE: Build failed with an exception.

I have tried installing all the GTK Canberra stuff on Ubuntu. No joy.

I think this is something to do with JavaFX trying to run the app in my native style with native fonts etc. but can't find the right files. I may be wrong.

Can anybody help?

Edit - As per the comment, I changed the

  getClass().getResource("scene.fxml")

to

  getClass().getClassLoader().getResource("scene.fxml")

and now I get the errors:

Gtk-Message: 06:39:30.226: Failed to load module "canberra-gtk-module"
Gtk-Message: 06:39:30.226: Failed to load module "canberra-gtk-module"
Exception in Application start method
java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1071)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.NullPointerException
    at Experimenting.App.start(App.java:20)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:474)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:447)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:446)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
    ... 1 more
Exception running application Experimenting.App

You are being fooled by the trace `Gtk-Message`. The error you get is `java.lang.NullPointerException: A location is required`. And the cause is (usually) an incorrect resource path passed to `FXMLLoader`. — mr mcwolf, Dec 16 '22 at 06:20
Thanks, that was the issue. Now I have more errors I can't even begin to fathom. I've edited my post. — LostInHilbertSpace, Dec 16 '22 at 06:43
*"and now I get the error: `Caused by: java.lang.NullPointerException at Experimenting.App.start(App.java:20)`"* -> counting down 3 lines from the last error which was at line 17, it is another resource error, this time for css lookup which can also be fixed by following the guide linked by @mrmcwolf, — jewelsea, Dec 16 '22 at 07:33
The Gtk-Message fix is on askunbuntu -> [Failed to load module “canberra-gtk-module”](https://askubuntu.com/questions/342202/failed-to-load-module-canberra-gtk-module-but-already-installed). I don't know how serious it is. Perhaps JavaFX will still work without it with all or limited functionality, I don't know. But you may as well try to install the module on your system. I know you said you already did, so I don't have much other advice about that. — jewelsea, Dec 16 '22 at 07:39
`libcanberra-gtk-module` is an ubuntu [sound library](https://packages.debian.org/stretch/libcanberra-gtk-module), so perhaps it won't be needed unless you want to play sound with the media classes. — jewelsea, Dec 16 '22 at 07:43
Ensure you are using the most recent stable versions of the JDK and JavaFX software, and that your OS is up-to-date. — jewelsea, Dec 16 '22 at 07:51

Failed to load module "canberra-gtk-module" Error when running javafx program in netbeans on Ubuntu

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