Spring Boot Aspect-Oriented Programming 3

Question 1

When two aspects apply to the same join point, which interface determines their execution order?

Accepted Answer

Ordered

Answer

Implementing the org.springframework.core.Ordered interface (or using @Order) on an aspect controls its precedence relative to other aspects.

Question 2

What does the 'args' PCD do in a pointcut expression?

Accepted Answer

Matches methods that declare specific formal parameters by type

Answer

The args() PCD matches join points where the arguments passed at runtime are instances of the given types.

Question 3

In Spring AOP, what proxy type is used by default when the target class does not implement any interface?

Accepted Answer

CGLIB subclass proxy

Answer

When no interface is available, Spring AOP falls back to CGLIB to create a subclass-based proxy of the target class.

Question 4

Which annotation would you place on a method inside an @Aspect class to reuse a pointcut expression across multiple advices?

Accepted Answer

@Pointcut

Answer

@Pointcut annotates an empty method whose expression becomes a named, reusable pointcut referenced by advice annotations.

Question 5

What does 'proxyTargetClass = true' do in @EnableAspectJAutoProxy?

Accepted Answer

Forces CGLIB proxying for all beans regardless of interface implementation

Answer

Setting proxyTargetClass=true forces Spring to use CGLIB subclass proxies for all beans, even those implementing interfaces.

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