22 October 2020

#Spring_AOP

#Spring_AOP

Key Concepts


Topic SubTopic Basic Intermediate Advanced Expert
Introduction What is AOP, Advantages, Use Cases ✅
Terminology Aspect, JoinPoint, Pointcut, Advice, Weaving ✅ ✅
Types of Advice Before, After, AfterReturning, AfterThrowing, Around ✅ ✅ ✅
Pointcut Expressions Execution, Within, Args, Annotation, Bean ✅ ✅
Spring AOP Architecture Proxy-based AOP, Target object, Advice chain ✅ ✅ ✅
Proxy Types JDK Dynamic Proxy, CGLIB Proxy ✅ ✅ ✅
AspectJ Integration @Aspect annotation, Spring configuration, XML support ✅ ✅ ✅
Weaving Compile-time, Load-time, Runtime ✅ ✅ ✅
Annotations in Spring AOP @Before, @After, @AfterReturning, @AfterThrowing, @Around ✅ ✅ ✅
Order of Aspects @Order annotation, precedence, multiple aspects ✅ ✅ ✅
Introduction to JoinPoints Accessing method parameters, signature, target object ✅ ✅ ✅
AspectJ Expression Language Execution(), Within(), Args(), @annotation(), this(), target() ✅ ✅ ✅
Introduction to Advice Methods Advice method parameters, returning values, handling exceptions ✅ ✅ ✅
AOP Use Cases Logging, Transaction Management, Security, Performance Monitoring ✅ ✅ ✅ ✅
Limitations of Spring AOP Cannot intercept calls within same class, Proxy limitations ✅ ✅ ✅
Testing Aspects Unit testing, Mocking dependencies, AspectJ testing tools ✅ ✅ ✅
Exception Handling in Advice AfterThrowing, handling custom exceptions ✅ ✅ ✅
Performance Considerations Proxy creation cost, advice overhead, best practices ✅ ✅ ✅
Dynamic Pointcuts Runtime matching, Conditional pointcuts ✅ ✅ ✅
Introduction to AOP ProxyFactory ProxyFactoryBean, programmatic proxy creation ✅ ✅ ✅
Spring Boot AOP Integration Auto-configuration, Aspect scanning, starter dependencies ✅ ✅ ✅ ✅
Nested Aspects Combining multiple aspects, advice chaining order ✅ ✅ ✅
Introductions (AOP feature) @DeclareParents, Introduction advice ✅ ✅ ✅
Security Aspects Role-based access, Method security with AOP ✅ ✅ ✅
Best Practices Avoid overusing AOP, maintain readability, minimize cross-cutting complexity ✅ ✅ ✅ ✅
Advanced Topics Load-time weaving, Aspect precedence, custom pointcut expressions ✅ ✅ ✅

Interview question

Basic Level

  1. What is AOP in Spring?
  2. What are the advantages of using AOP?
  3. What is a cross-cutting concern?
  4. What is an aspect in Spring AOP?
  5. What is advice in Spring AOP?
  6. What is a join point?
  7. What is a pointcut?
  8. What is weaving in AOP?
  9. What is a proxy in Spring AOP?
  10. Difference between proxy-based and AspectJ AOP?
  11. What is the difference between AOP and OOP?
  12. What are the different types of advice in Spring AOP?
  13. What is @Aspect annotation?
  14. How do you define a pointcut expression?
  15. What is the difference between before and after advice?
  16. What is after returning advice?
  17. What is after throwing advice?
  18. What is around advice?
  19. How do you apply multiple advices to the same join point?
  20. What is the default order of advice execution?
  21. How does Spring AOP integrate with Spring Boot?
  22. What is the difference between JDK dynamic proxy and CGLIB proxy?
  23. What limitations does Spring AOP have compared to AspectJ?
  24. How do you enable Spring AOP in XML configuration?
  25. How do you enable Spring AOP using annotations?

Intermediate Level

  1. How do you write a pointcut expression using execution()?
  2. How do you write a pointcut expression using within()?
  3. How do you write a pointcut expression using args()?
  4. How do you write a pointcut expression using @annotation()?
  5. What is the use of this() and target() pointcut designators?
  6. How do you combine multiple pointcut expressions?
  7. How do you pass method parameters to advice?
  8. How do you access return values in advice?
  9. How do you handle exceptions in advice?
  10. What is the use of JoinPoint object in advice?
  11. What is ProceedingJoinPoint?
  12. How do you implement around advice using ProceedingJoinPoint?
  13. How do you control the execution order of multiple aspects?
  14. How do you apply aspects to specific beans using @Component?
  15. How do you apply aspects using XML configuration?
  16. How do you test Spring AOP aspects?
  17. What are some common use cases for Spring AOP?
  18. How do you log method execution using AOP?
  19. How do you measure performance using AOP?
  20. How do you handle security using AOP?
  21. How do you implement transaction management using AOP?
  22. How do you create custom annotations for pointcuts?
  23. What are some best practices when using Spring AOP?
  24. How does AOP affect application performance?
  25. How do you debug AOP issues in Spring?

Advanced Level

  1. How does Spring AOP create proxies internally?
  2. How does CGLIB proxy differ from JDK dynamic proxy internally?
  3. What is the role of ProxyFactoryBean?
  4. How do you implement introduction (type) advice?
  5. How do you add methods or interfaces to existing beans?
  6. What is the difference between compile-time and runtime weaving?
  7. How do you use AspectJ load-time weaving?
  8. How do you configure AspectJ with Spring Boot?
  9. How do you implement conditional pointcuts?
  10. How do you implement dynamic pointcuts at runtime?
  11. How does Spring handle multiple aspects targeting the same join point?
  12. How do you handle nested aspects?
  13. How do you combine annotations and XML configuration in Spring AOP?
  14. How do you optimize AOP for performance?
  15. How do you avoid proxy overhead in Spring AOP?
  16. How do you handle self-invocation problem in AOP?
  17. How do you implement aspects for private methods?
  18. How do you handle exceptions thrown inside advice?
  19. How do you implement asynchronous advice?
  20. How do you implement retry logic using AOP?
  21. How do you handle method arguments modification in advice?
  22. How do you intercept return values and modify them?
  23. How do you implement caching using AOP?
  24. How do you implement auditing using AOP?
  25. How do you implement validation using AOP?

Expert Level

  1. How does Spring AOP differ from full AspectJ AOP?
  2. How do you configure AspectJ compile-time weaving?
  3. How do you configure AspectJ load-time weaving in a production environment?
  4. How do you integrate Spring AOP with other frameworks like Hibernate?
  5. How do you handle cross-module aspects in large projects?
  6. How do you monitor aspect execution in production?
  7. How do you handle aspect dependencies?
  8. How do you implement aspect prioritization in complex scenarios?
  9. How do you implement pointcut inheritance?
  10. How do you combine annotations and programmatic aspects?
  11. How do you implement custom pointcut designators?
  12. How do you implement security for aspect execution?
  13. How do you implement multi-threaded advice safely?
  14. How do you handle memory leaks with Spring AOP proxies?
  15. How do you implement logging with high-performance constraints?
  16. How do you implement aspect-driven performance metrics?
  17. How do you implement transaction rollback using AOP?
  18. How do you implement aspect-driven exception handling strategies?
  19. How do you implement dynamic proxies programmatically?
  20. How do you integrate Spring AOP with reactive programming?
  21. How do you use aspects in Spring WebFlux?
  22. How do you implement auditing for microservices using AOP?
  23. How do you implement cross-service logging using AOP?
  24. How do you integrate Spring AOP with cloud-native applications?
  25. What are the best practices for maintaining complex AOP configurations?

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