If an invalid font file is installed no javafx application can be launched un such a system because application startup fails with an NPE.

 Caused by: java.lang.NullPointerException

at com.sun.javafx.font.MacFontFinder.populateFontFileNameMap(MacFontFinder.java:99)

at com.sun.javafx.font.PrismFontFactory.getFullNameToFileMap(PrismFontFactory.java:1740)

at com.sun.javafx.font.PrismFontFactory.getFontResource(PrismFontFactory.java:469)

at com.sun.javafx.font.LogicalFont.getSlot0Resource(LogicalFont.java:194)

at com.sun.javafx.font.LogicalFont.getDefaultAAMode(LogicalFont.java:409)

at com.sun.javafx.font.LogicalFont.getStrike(LogicalFont.java:413)

at com.sun.javafx.font.PrismFont.getStrike(PrismFont.java:73)

at com.sun.javafx.text.PrismTextLayout.setContent(PrismTextLayout.java:138)

at javafx.scene.text.Text.getTextLayout(Text.java:229)

at javafx.scene.text.Text.needsFullTextLayout(Text.java:184)

at javafx.scene.text.Text.access$200(Text.java:95)

at javafx.scene.text.Text$5.invalidated(Text.java:501)

at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111)

at javafx.beans.property.ObjectPropertyBase.bind(ObjectPropertyBase.java:174)

at javafx.css.StyleableObjectProperty.bind(StyleableObjectProperty.java:75)

at com.sun.javafx.scene.control.skin.LabeledText.<init>(LabeledText.java:82)

at com.sun.javafx.scene.control.skin.LabeledSkinBase.<init>(LabeledSkinBase.java:125)

at com.sun.javafx.scene.control.skin.LabelSkin.<init>(LabelSkin.java:39)

at javafx.scene.control.Label.createDefaultSkin(Label.java:158)

at javafx.scene.control.Control.impl_processCSS(Control.java:872)

at javafx.scene.Parent.impl_processCSS(Parent.java:1280)

at javafx.scene.Parent.impl_processCSS(Parent.java:1280)

at javafx.scene.Parent.impl_processCSS(Parent.java:1280)

at javafx.scene.Parent.impl_processCSS(Parent.java:1280)

at javafx.scene.control.PopupControl$CSSBridge.impl_processCSS(PopupControl.java:1181)

at javafx.scene.Parent.impl_processCSS(Parent.java:1280)

at javafx.scene.Node.processCSS(Node.java:9058)

at javafx.scene.Node.applyCss(Node.java:9155)

at javafx.scene.control.PopupControl.recomputeSkinSize(PopupControl.java:965)

at javafx.scene.control.PopupControl.recalculateMinWidth(PopupControl.java:935)

at javafx.scene.control.PopupControl.minWidth(PopupControl.java:820)

at com.sun.javafx.scene.control.skin.ChoiceBoxSkin.computeMinWidth(ChoiceBoxSkin.java:331)

at javafx.scene.control.Control.computeMinWidth(Control.java:470)

at javafx.scene.Parent.minWidth(Parent.java:943)

at javafx.scene.layout.Region.minWidth(Region.java:1383)

at javafx.scene.layout.Region.computeChildMinAreaWidth(Region.java:1667)

at javafx.scene.layout.HBox.getAreaWidths(HBox.java:455)

at javafx.scene.layout.HBox.computeContentWidth(HBox.java:532)

at javafx.scene.layout.HBox.computeMinWidth(HBox.java:402)

at javafx.scene.Parent.minWidth(Parent.java:943)

at javafx.scene.layout.Region.minWidth(Region.java:1383)

at javafx.scene.layout.Region.computeChildMinAreaWidth(Region.java:1667)

at javafx.scene.layout.BorderPane.getAreaWidth(BorderPane.java:609)

at javafx.scene.layout.BorderPane.computeMinWidth(BorderPane.java:368)

at javafx.scene.Parent.minWidth(Parent.java:943)

at javafx.scene.layout.Region.minWidth(Region.java:1383)

at javafx.scene.layout.BorderPane.layoutChildren(BorderPane.java:484)

at javafx.scene.Parent.layout(Parent.java:1087)

at javafx.scene.Scene.doLayoutPass(Scene.java:552)

at javafx.scene.Scene.preferredSize(Scene.java:1646)

at javafx.scene.Scene.impl_preferredSize(Scene.java:1720)

at javafx.stage.Window$9.invalidated(Window.java:846)

at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)

at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)

at javafx.stage.Window.setShowing(Window.java:922)

at javafx.stage.Window.show(Window.java:937)

at javafx.stage.Stage.show(Stage.java:259)

This a severe bug because NO JavaFX applications can start on such a system!