Spring Boot Aspect-Oriented Programming 2

Question 1

Which Spring AOP advice type runs only when a method throws an exception?

Accepted Answer

@AfterThrowing

Answer

@AfterThrowing advice executes only when the advised method exits by throwing an exception.

Question 2

What object does @Around advice receive as its parameter to control method execution?

Accepted Answer

ProceedingJoinPoint

Answer

@Around advice must declare a ProceedingJoinPoint parameter, which provides the proceed() method to invoke the target.

Question 3

In a Spring Boot project, what triggers auto-configuration of AOP support?

Accepted Answer

Including spring-boot-starter-aop on the classpath

Answer

spring-boot-starter-aop pulls in the AspectJ weaver and auto-configures AOP proxying without any extra annotation.

Question 4

What does the 'within' PCD match on?

Accepted Answer

Types (classes or packages) containing join points

Answer

The within() pointcut designator limits matching to join points inside a specified type or package.

Question 5

How can you pass the thrown exception object into an @AfterThrowing advice method?

Accepted Answer

Declare a Throwable parameter with the same name as the 'throwing' attribute

Answer

Setting the 'throwing' attribute on @AfterThrowing and declaring a matching parameter binds the thrown exception to that parameter.

Spring Boot Practice Test