Java Version: OpenJDK1.6.0-ea-b05, jdk_10-ea-b11
Platform: Ubuntu8.04alpha4 hostname: peas.sfbay

Problems:
When luanch the FileChooserDemo, when you select GTK looks and Feel, the others are as default, then you click Show FileChooser, you can see in the terminal, it has lost message saying fail.
The output as following:
$ bin/java -jar demo/jfc/FileChooserDemo/*.jar

(<unknown>:12752): Gtk-WARNING **: Attempting to add a widget with type GtkButton to a GtkComboBoxEntry (need an instance of GtkEntry or of a subclass)

(<unknown>:12752): Gtk-CRITICAL **: gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed

(<unknown>:12752): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed

(<unknown>:12752): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed