How to Create a Session variable in JSP?

How to create a session variable and add attributes to it?
For example i want to create a session variable called "name" and add value "user" to it? if i try to do it with setAttribute(), it is giving error as both is of type string? how to do it? kindly help me

This is variable what is working in my aplication
String variable;
if(user == null){
               user=new String("");
     }//if you don'y do this you will have null pointer exception
session.setAttribute("user",user);//put value
          String name=(String)session.getAttribu("user");      //get value;
I hope this will help

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