Okt. 27, 2019 8:09:19 PM com.sun.javafx.css.StyleManager loadStylesheetUnPrivileged
WARNUNG: Resource "com/sun/javafx/scene/control/skin/modena/modena.css" not found.
Exception in thread "JavaFX Application Thread" java.lang.ExceptionInInitializerError
        at com.sun.javafx.tk.quantum.QuantumToolkit.createTKStage(QuantumToolkit.java:600)
        at javafx.stage.Stage.doVisibleChanging(Stage.java:1154)
        at javafx.stage.Stage$1.doVisibleChanging(Stage.java:182)
        at com.sun.javafx.stage.StageHelper.visibleChangingImpl(StageHelper.java:57)
        at com.sun.javafx.stage.WindowHelper.visibleChanging(WindowHelper.java:73)
        at javafx.stage.Window$12.invalidated(Window.java:1064)
        at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
        at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
        at javafx.stage.Window.setShowing(Window.java:1174)
        at javafx.stage.Window.show(Window.java:1189)
        at javafx.stage.Stage.show(Stage.java:273)
        at bluej.SplashWindow.<init>(SplashWindow.java:71)
        at bluej.Boot.lambda$new$0(Boot.java:179)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
        at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
        at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
        at com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
        at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: java.util.MissingResourceException: Can't find bundle for base name com.sun.javafx.tk.quantum.QuantumMessagesBundle, locale de_DE
        at java.base/java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:2055)
        at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1689)
        at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1593)
        at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1556)
        at java.base/java.util.ResourceBundle.getBundle(ResourceBundle.java:932)
        at com.sun.javafx.tk.quantum.WindowStage.<clinit>(WindowStage.java:101)
        ... 20 more