spring security concurrent-session-control

Using spring security concurrent-session-control we can stop a single user loggin in twice.

My requirement is i should not allow two persons access the same page at the same time.
For eg. When an admin is using modify details page and another admin tries to access the page the system has to give an error saying "You cannot use this page at this time" .

Kindly advice.

This isn't something that Spring Security supports. The implementation would probably depend heavily on the details of the requirements.