the attribute rendered requires either 'true' or 'false' to decide whether to display your table or not. And your resultList is certainly not returning a boolean.
Thank you for your reply. But could you explain this because i am new with hibernate.
Yor class studentList should have a method getResultList() or a Out-annotation on a List with the name resultList, or - in addition - a Factory annotation on a method which retrieves the values for you.
If needed we can look at you code, so it is helpful if you provide the code of the studentList bean.