A hierarchical URI is subject to further parsing according to the syntax

    [scheme:][//authority][path][?query][#fragment]

then path can be null- which is not possible according to RFC
if it can be null
then
http://sun.com?sid=130885#name
is a valid URI and shoud parse
but is is throwing exception

java.net.URISyntaxException: Illegal character in authority at index 7: http://sun.com?sid=130885#name

        at java.net.URI$Parser.fail(URI.java:2168)
        at java.net.URI$Parser.parseAuthority(URI.java:2494)
        at java.net.URI$Parser.parseHierarchical(URI.java:2414)
        at java.net.URI$Parser.parse(URI.java:2371)
        at java.net.URI.<init>(URI.java:413)
        at TestURI.testCons(TestURI.java:60)
        at TestURI.main(TestURI.java:36)