NullPointerException error in stage icon javafx

Question

The file "icon.png" is in the same folder as class. But if i just use (new Image("icon.png")) then it says java.lang.IllegalArgumentException: Invalid URL: Invalid URL or resource not found. But now after adding getClass().getResource... i'm getting this error. Here is my code:

package application;

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

public class Main extends Application {
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("NewFile.fxml"));
            Scene scene = new Scene(root);
            primaryStage.setResizable(false);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.getIcons().add(new Image(getClass().getResource("icon.png").toExternalForm()));
            primaryStage.show();
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }

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

And here is the error:

java.lang.NullPointerException
    at application.Main.start(Main.java:19)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(Unknown Source)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(Unknown Source)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(Unknown Source)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
    at java.base/java.lang.Thread.run(Unknown Source)

Please help me to fix it. Thanks in advance!

Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — khelwood, Dec 29 '17 at 13:15
Is the image in the resource folder along with the fxml and css files? — yarwest, Dec 29 '17 at 13:26
yes image is in the same folder along with fxml and css file — Zain Ul Abidin, Dec 29 '17 at 13:32

score 0 · Accepted Answer · answered Dec 29 '17 at 13:31

0

NullPointerException error is caused due to location of your image is not in the proper position your refer to something which not exist you can edit your post to show us your project construction
it should be somthing like that to work !

answered Dec 29 '17 at 13:31

Mazen Embaby

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Thank you so much for your help! – Zain Ul Abidin Dec 29 '17 at 13:40

NullPointerException error in stage icon javafx

1 Answers1