Doubt in Servlet Mapping definition given in HFSJ

[Renu Radhika]

In HFSJ book its told that if a url is encountered then container checks for an exact match,then the longest directory match to shortest and then extension.But in exercises they have marked two urls
/foo/bar and /foo/* so naturally a url like ..../foo/bar/.... should go to the servlet mapped to /foo/bar right?But they have given the answer as /foo/*.Can anyone please explain?

[Rahul Jadaun]

/foo/bar is an exact match, and it can be only that. It cannot act as a directory match. For ..../foo/bar/.... to match, the url-pattern has to be a directory match like /foo/bar/* or /foo/*(a directory match is one that always starts with / and ends in /*)

[Renu Radhika]

say the mapping is like what you have mentioned?in that case which will be called