When you start dragging the file dialog opened by either 'FileChooser' or 'DirectoryChooser', JVM crashes. If I don't drag the file dialog, I can select files or directories and close the dialog. The selected files or directories get returned correctly. However, when I start dragging the application window afterwards, JVM crashes. Note that dragging application window works fine before using FileChooser or DirectoryChooser.

I accidentally found a weird solution. If you create a new instance of 'JFileChooser' (of Swing) in your application anywhere before 'FileChooser' is used, this problem goes away. You don't have to use this 'JFileChooser' instance.