JavaFx - java.lang.IllegalArgumentException: Invalid URL or resource not found - javafx

Question

I recently started learning JavaFX and my class was given the following assignment:
Write a program that displays four images in a grid pane.
Here is my code:
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
public class Ch_14_Ex_1 extends Application {
#Override //Override the start method in the Application class
public void start(Stage primaryStage) {
//Create a pane to hold the image views
GridPane pane = new GridPane();
//Place nodes in the pane
pane.add(new ImageView(new Image("image/ukFlag1.gif")), 0, 0);
pane.add(new ImageView(new Image("image/canadaFlag1.gif")), 1, 0);
pane.add(new ImageView(new Image("image/chineseFlag1.gif")), 0, 1);
pane.add(new ImageView(new Image("image/usaFlag1.gif")), 1, 1);
//Create a scene and place it in the stage
Scene scene = new Scene(pane);
primaryStage.setTitle("Ch_14_Ex_1"); //Set the stage title
primaryStage.setScene(scene); //Place the scene in the stage
primaryStage.show(); //Display the stage
}
}
The program compiles fine but whenever I try to run the program I get the following error and i'm not sure how to fix it.
Exception in Application start method
Exception in thread "JavaFX BlueJ Helper" 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$155(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Invalid URL: Invalid URL or resource not found
at javafx.scene.image.Image.validateUrl(Image.java:1118)
at javafx.scene.image.Image.<init>(Image.java:620)
at Ch_14_Ex_1.start(Ch_14_Ex_1.java:16)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
... 1 more
Caused by: java.lang.IllegalArgumentException: Invalid URL or resource not found
at javafx.scene.image.Image.validateUrl(Image.java:1110)
... 11 more

Answer 1

You can set the resources folder in your project in case you wanna wrap it in your jar file and load them like so
new Image(getClass.getResourceAsStream("image/yourImage.gif"))
OR
If those images are not in your resources you can load them like so
new Image("file:image/yourimage.gif")