Run the attached sample. It creates a Box of D x 0 x D pixels size.

Rendering results in the following NPE:
java.lang.NullPointerException
at javafx.scene.shape.Box.impl_updatePG(Box.java:188)
at javafx.scene.Node.impl_syncPGNode(Node.java:476)
at javafx.scene.Scene$ScenePulseListener.syncAll(Scene.java:2178)
at javafx.scene.Scene$ScenePulseListener.syncAll(Scene.java:2187)
at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:2152)
at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2286)
at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:373)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:562)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:541)
at com.sun.javafx.tk.quantum.QuantumToolkit$15.run(QuantumToolkit.java:426)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:94)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:101)
at java.lang.Thread.run(Thread.java:722)