Spring Boot Core Container and Beans Questions and Answers

Question 1

Which of the following is the default scope for a Spring bean if no scope is explicitly specified?

Accepted Answer

singleton

Answer

request

Answer

prototype

Answer

session

Question 2

A developer needs to create a new instance of a `ShoppingCart` bean every time a user starts a new HTTP session. Which bean scope should be used?

Accepted Answer

session

Answer

prototype

Answer

request

Answer

singleton

Question 3

What is a primary difference between the `ApplicationContext` and `BeanFactory` IoC containers in Spring?

Accepted Answer

`ApplicationContext` is a sub-interface of `BeanFactory` and provides more advanced, enterprise-specific features like event publication and internationalization.

Answer

`BeanFactory` supports annotation-based configuration while `ApplicationContext` only supports XML.

Answer

`BeanFactory` eagerly initializes all singleton beans at startup, while `ApplicationContext` uses lazy initialization.

Answer

`ApplicationContext` is considered a lightweight container, whereas `BeanFactory` is heavyweight.

Question 4

In a Spring Boot application, which annotation is considered the most generic stereotype for marking a class as a Spring-managed component?

Accepted Answer

@Component

Answer

@Service

Answer

@Repository

Answer

@Controller

Question 5

A developer wants to ensure their dependency injection code is portable and not tightly coupled to the Spring Framework. Which annotation should they prefer for dependency injection?

Accepted Answer

@Inject

Answer

@Autowired

Answer

@Resource

Answer

@Bean

Question 6

What is the primary role of the Inversion of Control (IoC) container in the Spring Framework?

Accepted Answer

To manage the lifecycle and configuration of application objects (beans), including their creation and dependency injection.

Answer

To manage database transactions and connections directly.

Answer

To handle incoming HTTP requests and route them to controllers.

Answer

To compile Java source code into bytecode for the JVM.