Spring AOP MCQ - Multiple Choice Questions and Answers

At its heart, AOP is all about modularity and concerns separation, allowing developers to decouple cross-cutting concerns from the main application logic. While the concept might sound daunting initially, with the right resources, it's quite approachable. Here, we present a set of MCQ questions to test your knowledge of Spring AOP.

Note that each question is followed by the correct answer and an explanation to help reinforce your knowledge.

1. What does AOP stand for in Spring?

a) Advanced Object Programming

b) Aspect-Oriented Programming

c) Application-Oriented Programming

d) Asynchronous Operation Protocol

Answer:

b) Aspect-Oriented Programming

Explanation:

AOP stands for Aspect-Oriented Programming, which deals with cross-cutting concerns in applications.

2. Which of the following can be considered a cross-cutting concern?

a) Business logic

b) Authentication

c) Data validation

d) Feature toggles

Answer:

b) Authentication

Explanation:

Cross-cutting concerns are aspects that affect multiple parts of an application. Authentication, logging, and transactions are typical examples.

3. In Spring AOP, what is an "advice"?

a) A recommendation given by the Spring team

b) A method that handles a cross-cutting concern

c) An error thrown by the AOP process

d) A configuration recommendation

Answer:

b) A method that handles a cross-cutting concern

Explanation:

An advice is an action taken by an aspect for a particular join point (like method execution).

4. Which type of advice runs after the advised method completes without throwing any exception?

a) Before advice

b) Around advice

c) After returning advice

d) After throwing advice

Answer:

c) After returning advice

Explanation:

"After returning advice" is executed after the advised method completes successfully without throwing any exception.

5. Which of the following is NOT a type of advice in Spring AOP?

a) Around advice

b) Below advice

c) Before advice

d) After advice

Answer:

b) Below advice

Explanation:

"Below advice" isn't a type of advice in Spring AOP. The main advice types are Before, After, After returning, After throwing, and Around.

6. In Spring AOP, what defines a point where an advice should be executed?

a) Aspect

b) Join point

c) Pointcut

d) Advisor

Answer:

c) Pointcut

Explanation:

Pointcut defines the expressions that determine which join points (like method executions) should be matched for advice execution.

7. Which of the following is NOT true about Spring AOP?

a) It supports only method execution join points

b) It uses byte-code weaving

c) It is implemented using proxies

d) It's integrated with Spring's transaction management

Answer:

b) It uses byte-code weaving

Explanation:

Spring AOP is proxy-based and does not use byte-code weaving. Full-fledged AOP frameworks like AspectJ use byte-code weaving.

8. Which annotation can be used to define an aspect in Spring AOP?

a) @AspectDef

b) @AspectJ

c) @PointcutDef

d) @Aspect

Answer:

d) @Aspect

Explanation:

The @Aspect annotation is used in Spring AOP to define a class as an aspect.

9. Which advice runs irrespective of a method's successful execution or an exception being thrown?

a) Before advice

b) Around advice

c) After advice

d) After returning advice

Answer:

c) After advice

Explanation:

"After advice" runs after a method's execution, regardless of its outcome.

10. What's the primary module for AOP in Spring?

a) spring-core

b) spring-aop

c) spring-aspect

d) spring-beans

Answer:

b) spring-aop

Explanation:

The spring-aop module provides the AOP integrations for Spring applications.

11. Which AOP framework does Spring AOP integrate with for advanced AOP features?

a) JAspect

b) AspectC

c) AspectJ

d) WeaveJ

Answer:

c) AspectJ

Explanation:

Spring AOP provides integration with AspectJ for advanced AOP use-cases beyond its proxy-based model.

12. What does the "weaving" process in AOP refer to?

a) Creating XML configurations

b) The process of linking aspects with other application types

c) Generating proxies

d) Scanning components

Answer:

b) The process of linking aspects with other application types

Explanation:

Weaving is the process through which aspects are integrated into the application, either at compile-time, load-time, or runtime.

13. For a method execution, which advice wraps the execution and can decide whether to proceed with the execution?

a) Before advice

b) Around advice

c) After advice

d) After returning advice

Answer:

b) Around advice

Explanation:

"Around advice" surrounds the advised method execution and provides developers with the capability to customize behavior before and after the method invocation.

14. In Spring AOP, what is the purpose of the "target" object?

a) It defines the AOP proxy

b) It contains metadata about the AOP process

c) It is the actual object being advised

d) It represents the aspect instance

Answer:

c) It is the actual object being advised

Explanation:

In Spring AOP, the "target" object is the original object, and the advised object is the proxy instance.

15. Which of the following ensures that an advice runs regardless of the outcome of the join point?

a) @AfterReturning

b) @Around

c) @After

d) @Before

Answer:

c) @After

Explanation:

The @After annotation ensures that the corresponding advice runs no matter how the join point completes (either normally or due to an exception).

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