urgent problem

i am makin placement office automation system in jsp......i want to messege passing system in that .....by which a student can send messege to admin and vice versa...........how can i implement that..plz help me.

This is a forum, not a place to get your work done. So, show your effort here. What you've done so far?

i am only asking basic trick not the whole coding...........ok understand

Then it's better to come up with a solution, your own. Then others can comment on it.

As a hint, you want to connect with SMPP connection with a SMS service. Means that you want a way to send a message, for that you need a service provider, since you don't have your own server. That should be able to receive the messages as well, so that you can download them to your application.