Mats Gisselson

For some historical context, see the early discussion about the Variable DT engine setting in #1061.

``` javafx.scene.control.skin.TabPaneSkin.stopDrag.class java.lang.NullPointerException: null at javafx.scene.control.skin.TabPaneSkin.stopDrag(TabPaneSkin.java:2197) at javafx.scene.control.skin.TabPaneSkin.handleHeaderMouseReleased(TabPaneSkin.java:2025) at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)...

Hi! The error you got is an internal error in the JavaFx user-interface framework we use in the editor. It happens intermittently, but is unrelated to what you were doing....

Duplicate of #2692.

We're unable to reproduce this. Have you turned off GUI Shapes from the Visibility Filters menu under the little eye icon in the toolbar, perhaps?

Thanks for the very detailed report! It does indeed appear to be the same JDK issue. It is possible we could try the same workaround as the project you linked.

``` javafx.scene.control.skin.MenuButtonSkinBase.lambda$new$7.class java.lang.NullPointerException: null at javafx.scene.control.skin.MenuButtonSkinBase.lambda$new$7(MenuButtonSkinBase.java:188) at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) at java.security.AccessController.doPrivileged(AccessController.java) at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) at com.sun.glass.ui.win.WinApplication._runLoop(WinApplication.java) at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) at java.lang.Thread.run(Thread.java:834) ```

Can you describe what you were doing when this occurred? Is it reproducible?

This is actually a duplicate of #2696. The exception is in `TabPaneSkin.stopDrag`.