Hibernate Questions

List of popular Hibernate questions.

1. What is ORM?
2. Explain Object States in Hibernate.
3. Explain the types of caches.
4. How does First level and second level caches work?
5. Explain data mappings. Be prepared to write some of the mappings on paper (One to Many, Many to One, One to One, Many to Many mapping).
6. What is lazy fetching?
7. get and load method difference.
8. merge and update method difference.
9. Explain named query
10. Explain criteria queries
11. Explain Projection
12. How to create Session Factory in Hibernate?
13. Which is thread safe? Session of SessionFactory?
14. How to configure Second-Level Cache?
15. What is N+1 problem in Hibernate and how to overcome with it?
16. Sorted vs Ordered collections.