according to spec java.net.URI
The path component of a hierarchical URI is itself said to be absolute
if it begins with a
slash character ('/'); otherwise it is relative.
The path of a hierarchical URI that is either absolute or specifies an
authority is always absolute.

Then these URI Valid /Invalid??? to give it to URI(String str) constructor
ftp:/###@###.###:8080/./home/../hl130885/test
ftp:/hash@blr+sunray.india.sun.com:8080/test/../home/hl130885/test

If it is not valid then should throw exception. which it is not.

If valid then
for ftp:/###@###.###:8080/./home/../hl130885/test
it is parsing like this which i feel it is not correct.

Scheme =ftp
SchemeSpecificPart=/###@###.###:8080/./home/../hl130885/test
Fragment =null
Authority =null
Path =/###@###.###:8080/./home/../hl130885/test
Port =-1
Host =null
Query =null
UserInfo =null

for ftp:/hash@blr+sunray.india.sun.com:8080/test/../home/hl130885/test
it is parsing like this which i feel it is not correct.
Scheme =ftp
SchemeSpecificPart=/hash@blr+sunray.india.sun.com:8080/test/../home/hl130885/test
Fragment =null
Authority =null
Path =/hash@blr+sunray.india.sun.com:8080/test/../home/hl130885/test
Port =-1
Host =null
Query =null
UserInfo =null