Quiz: Spring Boot Interview Questions

5 questionsNo time limitPass: 60%+10 XP on first pass

The Java backend questions asked in fresher and 0–3 year interviews: Spring core, Spring Boot, REST, JPA and Hibernate, transactions, security and JWT, testing, microservices, Kafka and Docker — short answers linked to the lessons.

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Question 1
What is the difference between JPA and Hibernate?
They are competing databasesJPA is the specification; Hibernate is an implementation of itHibernate is the specification; JPA implements itJPA is only for MongoDB
Question 2
Which is a correct description of @RestController?
It is the same as @Service@Controller + @ResponseBody, so return values are written as JSONIt creates a database repositoryIt only handles GET requests
Question 3
Which locking approach adds a @Version column?
Optimistic lockingPessimistic lockingTable lockingDistributed locking with Kafka
Question 4
What does PATCH do compared with PUT?
PATCH deletes the resourcePATCH changes only some fields; PUT replaces the whole resourceThey are identicalPATCH creates a new resource
Question 5
How should services keep data consistent without sharing a database?
One distributed transaction across all databasesEach owns its data and they coordinate with events (Saga, outbox)Copy every table to every service nightlyLet the API gateway write to all databases

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