Spring Framework Spring Core & Dependency Injection 2

Question 1

What annotation limits the @Autowired candidate beans to a specific name?

Accepted Answer

@Qualifier

Answer

@Qualifier is used alongside @Autowired to narrow down the injection candidate when multiple beans of the same type exist.

Question 2

Which interface must be implemented to create a custom BeanPostProcessor in Spring?

Accepted Answer

BeanPostProcessor

Answer

Implementing the BeanPostProcessor interface allows custom logic to be applied before and after a bean's initialization callbacks.

Question 3

How do you specify the initialization method for a Spring bean in a @Bean definition?

Accepted Answer

@Bean(initMethod="methodName")

Answer

The initMethod attribute of @Bean specifies the name of the method to call after the bean is initialized by the container.

Question 4

What is the purpose of @Primary in Spring dependency injection?

Accepted Answer

Designates a bean as the default candidate when multiple beans of the same type exist

Answer

@Primary designates a bean as the preferred candidate for auto-wiring when multiple beans of the same type are present in the container.

Question 5

What is a Spring bean's lifecycle callback that executes before the bean is destroyed?

Accepted Answer

@PreDestroy

Answer

@PreDestroy marks a method to be called just before the bean is removed from the container, allowing cleanup of resources.

Spring Framework Practice Test