@After and @AfterReturning in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an @After advice that runs after the method execution.

Spring Boot

@After("execution(* com.example.service.UserService.[1](..))")
public void afterMethod() {
    System.out.println("Method finished.");
}

Drag options to blanks, or click blank then click option'

AgetUser

BUserService

Cexecution

DafterMethod

Attempts:

3 left

💡 Hint

Common Mistakes

Using class name instead of method name in the pointcut.

Leaving the method name blank.

Using the advice method name instead of the target method name.

The @After annotation requires the method name in the pointcut expression. Here, 'getUser' is the method we want to advise after execution.

2fill in blank

medium

Complete the code to create an @AfterReturning advice that captures the returned value.

Spring Boot

@AfterReturning(pointcut = "execution(* com.example.service.OrderService.placeOrder(..))", returning = "[1]")
public void afterReturningAdvice(Object [1]) {
    System.out.println("Returned: " + [1]);
}

Drag options to blanks, or click blank then click option'

AreturnValue

Boutput

Cvalue

Dresult

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching the 'returning' attribute and method parameter names.

Using a name in the method parameter that is not declared in 'returning'.

The 'returning' attribute name must match the parameter name in the advice method. 'result' is commonly used and matches both places.

3fill in blank

hard

Fix the error in the @AfterReturning advice by completing the missing part.

Spring Boot

@AfterReturning(pointcut = "execution(* com.example.repository.ProductRepository.findById(..))", returning = "[1]")
public void logReturnValue(Object [1]) {
    if ([1] != null) {
        System.out.println("Product found: " + [1]);
    }
}

Drag options to blanks, or click blank then click option'

Aproduct

Bresult

Cvalue

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for 'returning' and the method parameter.

Forgetting to declare the parameter in the advice method.

The 'returning' attribute and the method parameter must have the same name. 'result' is a common choice and fixes the mismatch error.

4fill in blank

hard

Fill both blanks to create an @After advice that runs after any method in the service package.

Spring Boot

@After("execution(* com.example.service.[1].*(..))")
public void afterAnyMethod() {
    System.out.println("A service method finished: [2]");
}

Drag options to blanks, or click blank then click option'

AUserService

BOrderService

Cservice

DUserService.getUser

Attempts:

3 left

💡 Hint

Common Mistakes

Using package name instead of class name in the pointcut.

Putting a method name instead of class name in the pointcut.

The pointcut targets all methods in the UserService class inside the service package. The print statement uses the class name for clarity.

5fill in blank

hard

Fill all three blanks to create an @AfterReturning advice that logs the returned value and method name.

Spring Boot

@AfterReturning(pointcut = "execution(* com.example.controller.[1].[2](..))", returning = "[3]")
public void logReturn(Object [3]) {
    System.out.println("Method [2] returned: " + [3]);
}

Drag options to blanks, or click blank then click option'

AUserController

BgetUserDetails

Cresult

DfetchData

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between 'returning' attribute and method parameter name.

Using wrong class or method names in the pointcut.

The pointcut targets the getUserDetails method in UserController. The returning attribute and parameter use 'result' to capture the return value.