Can't load css file in javafx 8

Question

Scene listenMenu = new Scene(root, 250, 272);
listenMenu.getStylesheets().add("styles.css");

This always worked for me to load my css file, but after a small IntelliJ update it gives me this error:

Juni 20, 2018 1:16:45 NACHM. com.sun.javafx.css.StyleManagerloadStylesheetUnPrivileged WARNING: Resource "styles.css" not found.

I tried to look for a solution on here but but nothing works. Taking the url and the toExternalForm() like this:

listenMenu.getStylesheets().add(getClass().getResource("src/main/resources/styles.css").toExternalForm());

throws this Exception:

    Exception in Application start method
Exception in thread "main" 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:564)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198)
    at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.NullPointerException
    at HDMStuttgart.GUI.ListGUI.start(ListGUI.java:37)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:919)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(PlatformImpl.java:449)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:175)
    ... 1 more

Project Stucture: - main -- java --- HDMStuttgart ---- GUI ----- ListGui.java <-- The java file

-- resources --- styles.css <-- the css file

Any suggestions would be highly appretiated!

Answer 1

try this: create a Java file

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class HelloStyledWorld extends Application {

    @Override
    public void start(Stage primaryStage) {
        Button btn = new Button();
        btn.setText("Say 'Hello Styled World'");
        btn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                System.out.println("Hello Styled World!");
            }
        });

        StackPane root = new StackPane();
        root.getChildren().add(btn);

        Scene scene = new Scene(root, 300, 250);
        scene.getStylesheets().add(getClass().getResource("style.css").toExternalForm());

        primaryStage.setTitle("Hello Styled World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

put the style.class in the same package as the .java file (or in the corresponding resource folder if you are using one.

verify that the build includes the correct css file into output folder. you can

System.out.println(getClass().getResource("style.css").toExternalForm());

to console to see where JavaFX is searching for the css and check if the css is available there.

Answer 2

If you are using scene.getStylesheets().add("com/whatever/stylesheet.css"); You have to link the whole path where it is located including the package after the src folder, not the src folder itself though.

If you are using scene.getStylesheets().add(getClass().getResource("stylesheet.css").toExternalForm());

The css file has to be located in the same dir as the java file you are loading it from. You only have to provide the file name.

If you are wanting to make it in a resource folder in the src folder then do that. If not I don't know how.