ClassCastException when adding IFD to the TIFFDirectory before the image write

Please run the attached code. The following exception will occur:

Exception in thread "main" java.lang.ClassCastException: javax.imageio.plugins.tiff.TIFFDirectory (in module: java.desktop) cannot be cast to com.sun.imageio.plugins.tiff.TIFFIFD (in module: java.desktop)
at com.sun.imageio.plugins.tiff.TIFFImageWriter.setupMetadata(java.desktop@9-ea/TIFFImageWriter.java:1479)
at com.sun.imageio.plugins.tiff.TIFFImageWriter.write(java.desktop@9-ea/TIFFImageWriter.java:2501)
at com.sun.imageio.plugins.tiff.TIFFImageWriter.write(java.desktop@9-ea/TIFFImageWriter.java:2313)
at javax.imageio.ImageWriter.write(java.desktop@9-ea/ImageWriter.java:595)
at IFDTest.writeImage(IFDTest.java:54)
at IFDTest.main(IFDTest.java:64)

JDK9 b111, Windows 7

The cast in TIFFImageWriter is
  exifIFD = (TIFFIFD)f.getDirectory();
(and there are some other similar casts in the sources which should probably be checked).


The same issue for GPS IFD (tag #34853)