Spring Boot Core Container and Beans 3

Question 1

What is the role of BeanPostProcessor in the Spring container lifecycle?

Accepted Answer

It intercepts beans before and after initialization to apply custom logic

Answer

BeanPostProcessor allows custom modification of new bean instances both before and after their init callbacks are called.

Question 2

Which method in the BeanFactory interface retrieves a bean by type?

Accepted Answer

getBean(Class<T> requiredType)

Answer

BeanFactory.getBean(Class<T>) looks up a bean by its type and returns it without needing to know its name.

Question 3

In Spring, what does @DependsOn("beanA") guarantee when placed on beanB?

Accepted Answer

beanA is initialized before beanB

Answer

@DependsOn ensures the listed beans are fully initialized before the annotated bean is created.

Question 4

Which Spring feature allows you to conditionally register a bean based on the presence of a class on the classpath?

Accepted Answer

@ConditionalOnClass

Answer

@ConditionalOnClass registers the bean only when the specified class is present on the classpath.

Question 5

What is the purpose of the @Primary annotation on a Spring bean?

Accepted Answer

It designates the preferred bean when multiple candidates exist for autowiring

Answer

@Primary tells Spring to prefer this bean over other candidates when resolving an ambiguous autowiring dependency.

Spring Boot Practice Test