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Build: NetBeans IDE Dev (Build 201603280001) VM: Java HotSpot(TM) 64-Bit Server VM, 1.9.0-ea-b93, Java(TM) SE Runtime Environment, 1.9.0-ea-b93 OS: Mac OS X User Comments: athompson: deployed web app Stacktrace: java.lang.NullPointerException at javafx.embed.swing.JFXPanel.paintComponent(JFXPanel.java:669) at javax.swing.JComponent.paint(JComponent.java:1056) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065)
Created attachment 159023 [details] stacktrace
scenePeer is null, but there is a check for this value. That means that someone had to call setEmbeddedScene() asynchronously, off the event thread. This might be a result of interference of two toolkits: AWT and FX.
https://bugs.openjdk.java.net/browse/JDK-8089841 is consistent with my findings.