Frameworks

Spring Boot

Basics

• What is Spring Boot

Internals

• What is @SpringBootApplication.

• Types of dependency injection, how does it work?

• What is the difference between @Autowired and constructor injection in Spring?

• How does spring boot auto configuration work bts?

Annotations

• What is difference between @Component and @Bean?

• Explain the purpose of the @Scope annotation in Spring?

• What is the role of @RestController in Spring, and how is it different from @Controller?

  • Can I use @Component in its place?

• How does Spring handle lifecycle events using @PostConstruct and @PreDestroy annotations?

Testing

• @SpringBootTest's purpose?

• What is @DirtiesContext annotation do?

Hibernate

Basics

• What is the difference between EntityManager and Session in JPA and Hibernate?

• What is dirty checking?

• Explain an entities life cycle in persistence context.

• How many Cache levels in hibernate and their scope or purpose.

• Can we disable level 1 cache?

Associations

Spring Data JPA

• What is JPA, how is it related to hibernate?

• Explain associations in Hibernate / JPA.

• Types of Fetch in Hibernation when entities are associated

• N + 1 select problem what is it? how to solve it?

• @Transactional purpose and working bts?

• Types of isolation level and propogation level.

• Entity Graph and its purpose, how is it dynamic?

Junit

• Mock vs Spy?

• @ExtendWith annotation purpose?

• @Mock vs @MockBean annotation?

• @InjectMock annotation purpose.

• How to test a private method