Styjun

We want to have a circle filled with a profile picture, loading the URL of the image.

We have tried loading the image with a URL on Windows, Linux, and MacOS. Turns out that the image processing works on Linux and MacOS, but doesn't work on Windows.

Circle circle = new Circle(25);
Image image = new Image("https://i.imgur.com/itElfV3.jpg");
circle.setFill(new ImagePattern(image));

We expect to have the circle with the profile picture inside it. But the result is a NullPointerException on Windows.
The error we then get is:

Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: Image must be non-null
 at com.sun.prism.paint.ImagePattern.<init>(ImagePattern.java:44)
 at com.sun.javafx.tk.quantum.QuantumToolkit.createImagePatternPaint(QuantumToolkit.java:905)
 at com.sun.javafx.tk.Toolkit.getPaint(Toolkit.java:657)
 at javafx.scene.paint.ImagePattern.acc_getPlatformPaint(ImagePattern.java:291)
 at javafx.scene.paint.Paint$1.getPlatformPaint(Paint.java:51)
 at javafx.scene.shape.Shape.updatePGShape(Shape.java:916)
 at javafx.scene.shape.Shape.impl_updatePeer(Shape.java:965)
 at javafx.scene.shape.Circle.impl_updatePeer(Circle.java:333)
 at javafx.scene.Node.impl_syncPeer(Node.java:503)
 at javafx.scene.Scene$ScenePulseListener.syncAll(Scene.java:2304)
 at javafx.scene.Scene$ScenePulseListener.syncAll(Scene.java:2313)
 at javafx.scene.Scene$ScenePulseListener.syncAll(Scene.java:2313)
 at javafx.scene.Scene$ScenePulseListener.syncAll(Scene.java:2313)
 at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2280)
 at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2419)
 at com.sun.javafx.tk.Toolkit.lambda$runPulse$29(Toolkit.java:398)
 at java.security.AccessController.doPrivileged(Native Method)
 at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:397)
 at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:424)
 at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:518)
 at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:498)
 at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:491)
 at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$403(QuantumToolkit.java:319)
 at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
 at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
 at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
 at java.lang.Thread.run(Thread.java:748)

The code does work on Windows if we load the image locally, but since we want users to be able to upload a new URL to their own profile pictures, we would like to use a link.

Your code should be work, but i don't know why not work, instead you can use InputStream to get the image from URL, here the example

Image image = null;
 try
 URL url = new URL("https://i.imgur.com/itElfV3.jpg");
 URLConnection connection = url.openConnection();
 InputStream inputStream = connection.getInputStream();
 image = new Image(inputStream);

 catch (IOException e)
 e.printStackTrace();
 

 Circle circle = new Circle(25);
 circle.setFill(new ImagePattern(image));