java.net.URI doesn't recognize IPvFuture hosts

a valid URI 's://@[v0.:]/path' isn't recognized with message 'Malformed IPv6 address'

IPvFuture is defined in RFC 3986 at page 19 as

IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
new URI( "s://@[vf0123456789aBcDe..::::a0-._~:!$&'()*+,;=]/path" ) throws exception
java.net.URISyntaxException: Illegal character in IPvFuture at index 8