Hi ,
Facing Lazy Initialization problem while trying to fetch child records.(Having child properitiess as Set) in POJO

Do you really believe anybody could give you an advice (other than RTF) reading this problem description? -:)

The problem you are having is that you are obtaining your object within an open session, closing the session, and then trying to access the 'child-objects'. In order to access these child objects, it must either be done within an open Hibernate Session, or, you need to have the fetch type for the records set to eager.

My suggestion is to keep the session open longer, otherwise you'll need more transactions. So, don't close your session so quickly. There are a number of ways to do this. If it is a web application, you should take a look at the Open Session in View design pattern/best practice. With this design, you can open a session when a web based request comes in, and close it when the resposne goes out. Hibernate will only load the records it needs, and you will minimize the number of database transactions that are needed.