After calling Platform.exit() of a webview running inside a Java FX frame we sometimes see the following Exception in the console printed one or more times without any functional impact:
Exception in thread "jfx" java.lang.NullPointerException at com.sun.javafx.tk.quantum.QuantumToolkit.isSupported(QuantumToolkit.java:1164) at com.sun.javafx.application.PlatformImpl.isSupportedImpl(PlatformImpl.java:954) at com.sun.javafx.application.PlatformImpl.isSupported(PlatformImpl.java:627) at javafx.application.Platform.isSupported(Platform.java:250) at com.sun.javafx.scene.input.PickResultChooser.processOffer(PickResultChooser.java:182) at com.sun.javafx.scene.input.PickResultChooser.offer(PickResultChooser.java:143) at javafx.scene.Node.doComputeIntersects(Node.java:5252) at javafx.scene.Node.access$600(Node.java:398) at javafx.scene.Node$1.doComputeIntersects(Node.java:456) at com.sun.javafx.scene.NodeHelper.computeIntersectsImpl(NodeHelper.java:180) at com.sun.javafx.scene.NodeHelper.computeIntersects(NodeHelper.java:133) at javafx.scene.Node.intersects(Node.java:5223) at javafx.scene.Node$1.intersects(Node.java:543) at com.sun.javafx.scene.NodeHelper.intersects(NodeHelper.java:258) at javafx.scene.web.WebView.doPickNodeLocal(WebView.java:1214) at javafx.scene.web.WebView.access$2800(WebView.java:101) at javafx.scene.web.WebView$11.doPickNodeLocal(WebView.java:1301) at com.sun.java.scene.web.WebViewHelper.pickNodeLocalImpl(WebViewHelper.java:89) at com.sun.javafx.scene.NodeHelper.pickNodeLocal(NodeHelper.java:128) at javafx.scene.Node.pickNode(Node.java:5192) at javafx.scene.Scene$MouseHandler.pickNode(Scene.java:3993) at javafx.scene.Scene$MouseHandler.access$1300(Scene.java:3579) at javafx.scene.Scene.pick(Scene.java:2029) at javafx.scene.Scene.access$6800(Scene.java:172) at javafx.scene.Scene$MouseHandler.process(Scene.java:3805) at javafx.scene.Scene$MouseHandler.access$1200(Scene.java:3579) at javafx.scene.Scene.processMouseEvent(Scene.java:1849) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295) at java.base/java.security.AccessController.doPrivileged(AccessController.java:391) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433) at com.sun.glass.ui.View.handleMouseEvent(View.java:556) at com.sun.glass.ui.View.notifyMouse(View.java:942) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) at java.base/java.lang.Thread.run(Thread.java:830) This Exception appears in several past bug reports as fixed but I can still reproduce it with all versions.
