java.lang.NullPointerException
   at java.util.Arrays$ArrayList.<init>(Arrays.java:3357)
   at java.util.Arrays.asList(Arrays.java:3343)
   at sun.awt.shell.Win32ShellFolderManager2.isFileSystemRoot(Win32ShellFolderManager2.java:358)
   at sun.awt.shell.ShellFolder.isFileSystemRoot(ShellFolder.java:242)
   at javax.swing.filechooser.FileSystemView.isFileSystemRoot(FileSystemView.java:323)
   at javax.swing.filechooser.FileSystemView.getShellFolder(FileSystemView.java:531)
   at javax.swing.filechooser.FileSystemView.getFiles(FileSystemView.java:443)
   at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.run0(BasicDirectoryModel.java:218)
   at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.run(BasicDirectoryModel.java:211)