[Solved] What is wrong with this AOP advice for measuring execution time? @Around("execution(* com.example..*(..))") public void measure(ProceedingJoinPoint pjp) throws Throwable { long start = System.... | Spring Boot

Spring Boot - Aspect-Oriented Programming

What is wrong with this AOP advice for measuring execution time?

@Around("execution(* com.example..*(..))")
public void measure(ProceedingJoinPoint pjp) throws Throwable {
  long start = System.currentTimeMillis();
  pjp.proceed();
  long end = System.currentTimeMillis();
  System.out.println("Time: " + (end - start));
}

AThe pointcut expression is invalid

BThe method should return Object, not void

CSystem.currentTimeMillis() cannot be used for timing

DProceedingJoinPoint cannot be used in @Around advice

Step-by-Step Solution

Solution:

Step 1: Check method signature for @Around advice
@Around advice must return the result of pjp.proceed() to maintain method behavior.
Step 2: Identify missing return statement
Method returns void but should return Object from pjp.proceed().
Final Answer:
The method should return Object, not void -> Option B
Quick Check:
@Around advice must return method result [OK]

Quick Trick: @Around methods must return Object from proceed() [OK]

Common Mistakes:

Forgetting to return pjp.proceed() result
Thinking pointcut syntax is wrong
Believing System.currentTimeMillis() is invalid

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What is wrong with this AOP advice for measuring execution time?

Step 1: Check method signature for @Around advice

Step 2: Identify missing return statement

Final Answer:

Quick Check:

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