Not sure about how many rounds. I was rejected in first round itself. Interviewer was not professional. Interview was not like a discussion, it was more like a question and answer session. Below are the questions asked 1. How to avoid duplicate in Arraylist 2. What is the principal of micro services? 3. How do you move application to cloud? 4. When do we override equals and hashcode? 5. Difference between hashmap and hashtable? 6. What is the error when we add duplicate key to map? 7. Java8 features 8. How to use streams with list 9. How to implement pagination without Page object? 10. How to get an object from Arraylist if we have 1lakh objects? 11. How to avoid duplicate objects without overriding equals and hashcode? 12. When to choose RDBMS and MongoDB? 13. Which DB suited for transactional data i.e continuously addition 14. Difference between equals and == 15. new String ("a"), new String ("a") how many objects? 16. Difference between spring and spring boot 17. How to update spring boot versions? 18. What happens internally when we use new keyword. I was rejected even though I did pretty well and not sure about interviewer expectations