quite similar to JDK-8169650.

Please run the following code:

        int type = TIFFTag.TIFF_LONG;
        TIFFField f = new TIFFField(new TIFFTag("TAG", 123456, 1 << type),
            type, 1, new long[]{-100L});
        
        System.out.println(f.getAsLong(0));
        System.out.println(f.getValueAsString(0));

Output (JDK9 b142) - NOK:
    -100
    -100

but TIFF_LONG is "32-bit (4-byte) unsigned integer" (http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf) (?)

at the same time TIFFField(TIFFTag tag, int value) constructor will throw an IllegalArgumentException exception (as expected).