org.xbill.DNS.TypeTest::test_string() assumes that RR type 256 doesn't exist, although this code is allocated by IANA to the URI record. This prevents addition of code to handle the URI record (a patch with this enhancement on its way).
The value 65536 ("Reserved") would be better, or alternatively 32770 ("Unassigned")
http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4
Committed. Thanks!
Ticket moved from /p/dnsjava/patches/26/