Exception is thrown during 3DViewer close. JavaFX samples, current working directory on read-only file system.

java.io.FileNotFoundException: Jfx3dViewerApp_session.properties (Read-only file system)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:206)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:95)
        at java.io.FileWriter.<init>(FileWriter.java:63)
        at com.javafx.experiments.jfx3dviewer.SessionManager.saveSession(SessionManager.java:96)
        at com.javafx.experiments.jfx3dviewer.Jfx3dViewerApp$1.handle(Jfx3dViewerApp.java:75)
        at com.javafx.experiments.jfx3dviewer.Jfx3dViewerApp$1.handle(Jfx3dViewerApp.java:72)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
        at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
        at javafx.event.Event.fireEvent(Event.java:204)
        at com.sun.javafx.stage.WindowPeerListener.closing(WindowPeerListener.java:80)
        at com.sun.javafx.tk.quantum.GlassWindowEventHandler.run(GlassWindowEventHandler.java:113)
        at com.sun.javafx.tk.quantum.GlassWindowEventHandler.run(GlassWindowEventHandler.java:39)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.tk.quantum.GlassWindowEventHandler.handleWindowEvent(GlassWindowEventHandler.java:130)
        at com.sun.glass.ui.Window.handleWindowEvent(Window.java:1235)
        at com.sun.glass.ui.Window.notifyClose(Window.java:1139)
        at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
        at com.sun.glass.ui.gtk.GtkApplication.access$200(GtkApplication.java:48)
        at com.sun.glass.ui.gtk.GtkApplication$6$1.run(GtkApplication.java:149)
        at java.lang.Thread.run(Thread.java:744)