Spring Boot Aspect-Oriented Programming 5

Question 1

What does the 'execution' PCD wildcard '..' mean when used in the parameter position?

Accepted Answer

Any number of parameters of any type

Answer

In the parameter position of execution(), '..' matches zero or more parameters of any type.

Question 2

Which Spring AOP advice fires regardless of whether the method returns normally or throws an exception?

Accepted Answer

@After

Answer

@After (finally) advice always runs after the method exits, whether by normal return or by throwing an exception.

Question 3

How can you restrict a pointcut to methods annotated with a custom annotation @Auditable?

Accepted Answer

@annotation(com.example.Auditable)

Answer

@annotation(fully.qualified.AnnotationType) matches any method directly annotated with that annotation.

Question 4

What does 'target' PCD match on, as opposed to 'this'?

Accepted Answer

'target' matches the proxied target object; 'this' matches the proxy

Answer

In Spring AOP, 'this' refers to the proxy bean, while 'target' refers to the actual target object being proxied.

Question 5

What is the correct return type for an @Around advice method that must return a value?

Accepted Answer

Object

Answer

@Around advice must return Object so it can propagate whatever value proceed() returns (or a substituted value).

Spring Boot Practice Test