Cross-cutting concerns concept in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Spring Boot aspect for logging.

Spring Boot

import org.aspectj.lang.annotation.[1];

@Aspect
public class LoggingAspect {
    // aspect code
}

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

AComponent

BAspect

CService

DRepository

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component instead of @Aspect

Forgetting to import the correct annotation

The @Aspect annotation marks the class as an aspect for cross-cutting concerns like logging.

2fill in blank

medium

Complete the code to define a pointcut expression for all methods in service package.

Spring Boot

@Pointcut("execution(* com.example.service..*[1]*(..))")
public void serviceMethods() {}

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

A.

B+

C*

DService

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' which results in ..*** a non-standard pattern

Using '+' which is used for subclass matching in parameters

The . separates the class name pattern * from the method name pattern * in the execution pointcut.

3fill in blank

hard

Fix the error in the advice annotation to run before methods matched by pointcut.

Spring Boot

@[1]("serviceMethods()")
public void beforeAdvice() {
    System.out.println("Before method execution");
}

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

ABefore

BAfter

CAround

DPointcut

Attempts:

3 left

💡 Hint

Common Mistakes

Using @After instead of @Before

Using @Pointcut instead of advice annotation

The @Before annotation runs advice before the matched methods.

4fill in blank

hard

Fill both blanks to create an aspect that logs method execution time.

Spring Boot

public @[1] class PerformanceAspect {

    @Around("execution(* com.example..*.*(..))")
    public Object logExecutionTime(ProceedingJoinPoint joinPoint) throws Throwable {
        long start = System.currentTimeMillis();
        Object proceed = joinPoint.[2]();
        long executionTime = System.currentTimeMillis() - start;
        System.out.println(joinPoint.getSignature() + " executed in " + executionTime + "ms");
        return proceed;
    }
}

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

AAspect

BComponent

Cproceed

Dproceed()

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component instead of @Aspect

Calling proceed without parentheses

The class must be annotated with @Aspect to define an aspect. The method proceed() runs the original method.

5fill in blank

hard

Fill all three blanks to define a Spring bean for an aspect with logging advice.

Spring Boot

@[1]
public class LoggingAspect {

    @[2]("execution(* com.example..*.*(..))")
    public void logBefore() {
        System.out.println("Method called");
    }

    @Bean
    public LoggingAspect [3]() {
        return new LoggingAspect();
    }
}

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

AAspect

BBefore

CloggingAspect

DComponent

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component instead of @Aspect

Using @After instead of @Before

Naming the bean method with uppercase letters

The class must be annotated with @Aspect to define an aspect. The advice uses @Before. The bean method name is usually camelCase.