<jsp:useBean id="guest" scope="page"  class ="my34.GuestBean" />

<jsp:setProperty name="guest" property="firstName" value="fghghgfh" />

 package  my34;

 public   class  GuestBean {
     private  String firstName, lastName, email;
     public  GuestBean (){ }
     public   void  setFerstName(String name){
         this .firstName = name;
    }
     public  String getFirstName(){
         return  firstName;
    }
     public   void  setLastName(String name){
         this .lastName = name;
    }
     public  String getLastName(){
         return  lastName;
    }
     public   void  setEmail(String address){
         this .email = address;
    }
     public  String getEmail(){
         return  email;
    }
}