LaF/Swing Exception with Darkmonkey

This could very well be a bug in the JDK 11 that I use locally, most likely out of our scope to fix, but we can still track it here:

java.lang.NullPointerException
	at java.desktop/javax.swing.GrayFilter.createDisabledImageImpl(GrayFilter.java:63)
	at java.desktop/javax.swing.GrayFilter.createDisabledImage(GrayFilter.java:58)
	at java.desktop/javax.swing.text.html.ImageView.getImage(ImageView.java:238)
	at java.desktop/javax.swing.text.html.ImageView.paint(ImageView.java:409)
	at java.desktop/javax.swing.text.BoxView.paintChild(BoxView.java:162)
	at java.desktop/javax.swing.text.BoxView.paint(BoxView.java:434)
	at java.desktop/javax.swing.text.BoxView.paintChild(BoxView.java:162)
	at java.desktop/javax.swing.text.BoxView.paint(BoxView.java:434)
	at java.desktop/javax.swing.text.ParagraphView.paint(ParagraphView.java:573)
	at java.desktop/javax.swing.text.html.ParagraphView.paint(ParagraphView.java:238)
	at java.desktop/javax.swing.text.BoxView.paintChild(BoxView.java:162)
	at java.desktop/javax.swing.text.BoxView.paint(BoxView.java:434)
	at java.desktop/javax.swing.text.html.BlockView.paint(BlockView.java:282)
	at java.desktop/javax.swing.text.BoxView.paintChild(BoxView.java:162)
	at java.desktop/javax.swing.text.BoxView.paint(BoxView.java:434)
	at java.desktop/javax.swing.text.html.BlockView.paint(BlockView.java:282)
	at java.desktop/javax.swing.text.BoxView.paintChild(BoxView.java:162)
	at java.desktop/javax.swing.text.BoxView.paint(BoxView.java:434)
	at java.desktop/javax.swing.text.html.BlockView.paint(BlockView.java:282)
	at java.desktop/javax.swing.plaf.basic.BasicTextUI$RootView.paint(BasicTextUI.java:1530)
	at java.desktop/javax.swing.plaf.basic.BasicTextUI.paintSafely(BasicTextUI.java:759)
	at java.desktop/javax.swing.plaf.basic.BasicTextUI.paint(BasicTextUI.java:917)
	at java.desktop/javax.swing.plaf.basic.BasicTextUI.update(BasicTextUI.java:896)
	at java.desktop/javax.swing.JComponent.paintComponent(JComponent.java:797)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1074)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JViewport.paint(JViewport.java:737)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JSplitPane.paintChildren(JSplitPane.java:1024)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:907)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1083)
	at java.desktop/javax.swing.JComponent.paintToOffscreen(JComponent.java:5255)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBufferedImpl(RepaintManager.java:1643)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1618)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1556)
	at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1323)
	at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5203)
	at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5013)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:865)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:848)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:848)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:823)
	at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:772)
	at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1890)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

No project file or test is named. Start by reproducing the Darkmonkey interaction on JDK 11 and use the supplied Swing stack trace to determine whether the failure is in the SDK or the JDK. Done means confirming the cause and identifying a scoped fix, workaround, or documented out-of-scope status.