On both linux and r-pi, HelloTreeTableView throws the following ClassCastException:

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Caused by: java.lang.ClassCastException: sun.awt.image.ToolkitImage cannot be cast to java.awt.image.BufferedImage
at helloworld.HelloTreeTableView.createNode(HelloTreeTableView.java:546)
at helloworld.HelloTreeTableView.buildFileBrowserTreeTableView(HelloTreeTableView.java:425)
at helloworld.HelloTreeTableView.buildFileSystemBrowserTab(HelloTreeTableView.java:303)
at helloworld.HelloTreeTableView.getContent(HelloTreeTableView.java:114)
at helloworld.HelloTreeTableView.start(HelloTreeTableView.java:87)
at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
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)
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