I could see java.lang.NullPointerException getting logged 3 times when test.javafx.scene.control.ComboBoxTest is run on Mac OS. ( Platform on which it is run should not matter I guess)

Here is the call log :
-----------------------------------------------------------------------------
Exception in thread "Test worker" java.lang.NullPointerException
     at javafx.controls/javafx.scene.control.skin.ComboBoxPopupControl.positionAndShowPopup(ComboBoxPopupControl.java:419)
     at javafx.controls/javafx.scene.control.skin.ComboBoxPopupControl.show(ComboBoxPopupControl.java:252)
     at javafx.controls/javafx.scene.control.skin.ComboBoxBaseSkin.lambda$new$6(ComboBoxBaseSkin.java:128)
     at javafx.controls/com.sun.javafx.scene.control.LambdaMultiplePropertyChangeListenerHandler.lambda$new$1(LambdaMultiplePropertyChangeListenerHandler.java:49)
     at javafx.base/javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:86)
     at javafx.base/com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:181)
     at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
     at javafx.base/javafx.beans.property.ReadOnlyBooleanPropertyBase.fireValueChangedEvent(ReadOnlyBooleanPropertyBase.java:72)
     at javafx.base/javafx.beans.property.ReadOnlyBooleanWrapper.fireValueChangedEvent(ReadOnlyBooleanWrapper.java:103)
     at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:111)
     at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
     at javafx.controls/javafx.scene.control.ComboBoxBase.setShowing(ComboBoxBase.java:187)
     at javafx.controls/javafx.scene.control.ComboBoxBase.show(ComboBoxBase.java:395)
     at test.javafx.scene.control.ComboBoxTest.ensureCanToggleShowing(ComboBoxTest.java:707)
-----------------------------------------------------------------------------------------------------
    Exception in thread "Test worker" java.lang.NullPointerException
     at javafx.controls/javafx.scene.control.skin.ComboBoxPopupControl.positionAndShowPopup(ComboBoxPopupControl.java:419)
     at javafx.controls/javafx.scene.control.skin.ComboBoxPopupControl.show(ComboBoxPopupControl.java:252)
     at javafx.controls/javafx.scene.control.skin.ComboBoxBaseSkin.lambda$new$6(ComboBoxBaseSkin.java:128)
     at javafx.controls/com.sun.javafx.scene.control.LambdaMultiplePropertyChangeListenerHandler.lambda$new$1(LambdaMultiplePropertyChangeListenerHandler.java:49)
     at javafx.base/javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:86)
     at javafx.base/com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:181)
     at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
     at javafx.base/javafx.beans.property.ReadOnlyBooleanPropertyBase.fireValueChangedEvent(ReadOnlyBooleanPropertyBase.java:72)
     at javafx.base/javafx.beans.property.ReadOnlyBooleanWrapper.fireValueChangedEvent(ReadOnlyBooleanWrapper.java:103)
     at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:111)
     at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
     at javafx.controls/javafx.scene.control.ComboBoxBase.setShowing(ComboBoxBase.java:187)
     at javafx.controls/javafx.scene.control.ComboBoxBase.show(ComboBoxBase.java:395)
     at test.javafx.scene.control.ComboBoxTest.ensureCanNotToggleShowingWhenDisabled(ComboBoxTest.java:718)
---------------------------------------------------------------------------------------------------
    Exception in thread "Test worker" java.lang.NullPointerException
     at javafx.controls/javafx.scene.control.skin.ComboBoxPopupControl.positionAndShowPopup(ComboBoxPopupControl.java:419)
     at javafx.controls/javafx.scene.control.skin.ComboBoxPopupControl.show(ComboBoxPopupControl.java:252)
     at javafx.controls/javafx.scene.control.skin.ComboBoxBaseSkin.lambda$new$6(ComboBoxBaseSkin.java:128)
     at javafx.controls/com.sun.javafx.scene.control.LambdaMultiplePropertyChangeListenerHandler.lambda$new$1(LambdaMultiplePropertyChangeListenerHandler.java:49)
     at javafx.base/javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:86)
     at javafx.base/com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:181)
     at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
     at javafx.base/javafx.beans.property.ReadOnlyBooleanPropertyBase.fireValueChangedEvent(ReadOnlyBooleanPropertyBase.java:72)
     at javafx.base/javafx.beans.property.ReadOnlyBooleanWrapper.fireValueChangedEvent(ReadOnlyBooleanWrapper.java:103)
     at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:111)
     at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
     at javafx.controls/javafx.scene.control.ComboBoxBase.setShowing(ComboBoxBase.java:187)
     at javafx.controls/javafx.scene.control.ComboBoxBase.show(ComboBoxBase.java:395)
     at test.javafx.scene.control.ComboBoxTest.ensureImpl_getPseudoClassStateReturnsValidValue(ComboBoxTest.java:645)



Action needed :
If these are expected exceptions, they should be wrapped around to result in a meaningful message, otherwise, they should result in test failure or should be fixed.