There were 3 rounds (technical, manager, and HR) of interview followed by an online MCQ test. The interview process is too slow, and they do not release the offer in less than 2 months. Most of the time, they keep you on hold.

The interviewer asked questions mostly on basics of Java & Spring.

1. Java 8 Stream API & Lambda expressions
2. Sort employee based on salary using stream API
3. What is composition & advantages of composition over inheritance
4. Singleton class & race conditions
5. How do you connect to multiple databases in the same application?
6. Spring scopes
7. How do you make a Spring bean thread-safe?
8. ExecutorService & utilization
9. SQL joins
10. Difference between function & procedure
11. Difference between List, Set & Map
12. Concurrent HashMap internal implementation
13. What is dispatcher servlet in Spring?
14. Cyclic dependency issues in Spring & how to resolve them
15. How do you create a Spring Boot application?
16. What happens if we annotate a controller with @Component, will it work?