I am using websphere app server.
But I want to use hot deployment feature in my application so that I don't require to restart my server when I make changes in my code.

Is anyone knows if I will use RAD tool is it possible to support hot deployment feature.
I have gone through RAD documentation but I haven't got any information about hot deployment.

what "RAD tool"?
Hot deployment is a feature of the server, if it supports it and your "RAD tool" can make use of it, it should work.
Read the documentation better.