Hi Sandeep Kumar, that depends which version you're migrating from.
We try to not make significant changes within a same major version, but that Projection change would be a significant change. My guess is you're using some version 4.x ?
Then you will have several changes to make, we created a guide to help for the upgrade here: http://hibernate.org/search/documentation/migrate/5.0/
Please use the forums for such questions, the team tries to help there too: https://forum.hibernate.org/viewforum.php?f=9