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I'm trying to convert Base64 Image Strings and some URLs to image form but one or more of the images I get from the server seem to be corrupted. I can pick them out per hand but I need a code solution for this. I wrote the method prepareAvatar which gets a String avatar that is either a Base64 String or an URL, like imgur or something like that.

    public Circle prepareAvatar(String avatar) {
        Image image;
        if (avatar == null || avatar.equals("")) {
            image = defaultAvatar;
        }else{
            Image newImage = new Image(avatar);
            if(newImage == null){
                image = defaultAvatar;
            }else{
                image = newImage;
            }

        }
        Circle avatarCircle = new Circle();
        avatarCircle.setRadius(Constants.AVATAR_SIZE);
        avatarCircle.setStroke(Color.BLACK);
        avatarCircle.setFill(new ImagePattern(image));
        return avatarCircle;
    }

At the moment I just try to filter out alle avatars which are null or "" and that seems to work. Because I get the exception "Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: Image must be non-null" I tried to create a new Instance of Image newImage and just check whether it is not null. That doesn't seem to work and I still get the same exception. Stacktrace:

Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: Image must be non-null
    at com.sun.prism.paint.ImagePattern.<init>(ImagePattern.java:47)
    at com.sun.prism.paint.ImagePattern.<init>(ImagePattern.java:65)
    at com.sun.javafx.tk.quantum.QuantumToolkit.createImagePatternPaint(QuantumToolkit.java:981)
    at com.sun.javafx.tk.Toolkit.getPaint(Toolkit.java:680)
    at javafx.scene.paint.ImagePattern.acc_getPlatformPaint(ImagePattern.java:292)
    at javafx.scene.paint.Paint$1.getPlatformPaint(Paint.java:48)
    at javafx.scene.shape.Shape.updatePGShape(Shape.java:963)
    at javafx.scene.shape.Shape.doUpdatePeer(Shape.java:998)
    at javafx.scene.shape.Shape$1.doUpdatePeer(Shape.java:131)
    at com.sun.javafx.scene.shape.ShapeHelper.updatePeerImpl(ShapeHelper.java:74)
    at com.sun.javafx.scene.shape.CircleHelper.updatePeerImpl(CircleHelper.java:64)
    at com.sun.javafx.scene.NodeHelper.updatePeer(NodeHelper.java:103)
    at javafx.scene.Node.syncPeer(Node.java:715)
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2399)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.Node.getScene()" because "<local2>" is null
    at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2398)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545)
    at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:421)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:420)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:450)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:575)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:555)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:548)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:353)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Nandini Srivastava
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KaraokeKarsten
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  • "_gets a String avatar that is either a Base64 String or a URL_" – Then you need to handle both cases. The `Image(String)` constructor expects a URL or a resource name. So, if `avatar` is a URL, then you can just pass it to the constructor. But if `avatar` is a Base64-encoded string, then you need to decode the string into bytes, wrap the bytes in a `ByteArrayInputStream`, and then pass the stream to the `Image(InputStream)` constructor. – Slaw May 31 '22 at 10:17
  • Also, `newImage == null` can _never_ be true in your code. A constructor either returns a new instance of the class, or throws an exception; it cannot return `null`. The only other thing I can imagine being `null` in the code you've shown is `defaultAvatar`. Make sure that field is not `null`. – Slaw May 31 '22 at 10:19

1 Answers1

0

You should have a look at Java exception handling. You have to catch the exceptions which may result from a failed image generation. If you are using an IDE you can let that create this for you. https://docs.oracle.com/javase/tutorial/essential/exceptions/catch.html

I also doubt that Base64 encoded images can be decoded this way at all. You will probably have to convert them back to a real image by other means. Convert base64 string to image or convert the raw encoded data to a data URL as described here: https://stackoverflow.com/a/72482868/4262407

mipa
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