Bean lifecycle overview in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Spring bean using annotation.

Spring Boot

@Component
public class MyService {
    // Bean logic here
}

// The annotation [1] marks this class as a Spring bean.

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

A@Repository

B@Service

C@Component

D@Controller

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Service or @Repository when the question asks for a generic bean annotation.

Forgetting to add any annotation.

The @Component annotation tells Spring to treat this class as a bean and manage its lifecycle.

2fill in blank

medium

Complete the code to implement a method that runs after bean initialization.

Spring Boot

public class MyBean implements InitializingBean {
    @Override
    public void [1]() throws Exception {
        System.out.println("Bean is initialized");
    }
}

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

AafterPropertiesSet

Bstart

Cinit

DpostConstruct

Attempts:

3 left

💡 Hint

Common Mistakes

Using @PostConstruct annotation method name instead of interface method.

Using a method name not defined in InitializingBean.

The afterPropertiesSet() method is called by Spring after the bean's properties are set, signaling initialization completion.

3fill in blank

hard

Fix the error in the bean destruction method name.

Spring Boot

public class MyBean implements DisposableBean {
    @Override
    public void [1]() throws Exception {
        System.out.println("Bean is being destroyed");
    }
}

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

Adestroy

Bdestroyed

Cdestroy()

DdestroyBean

Attempts:

3 left

💡 Hint

Common Mistakes

Adding parentheses in the method name placeholder.

Using incorrect method names like destroyBean or destroyed.

The correct method name in DisposableBean is destroy() without parentheses in the method signature placeholder.

4fill in blank

hard

Fill both blanks to define a bean with custom init and destroy methods.

Spring Boot

@Bean(initMethod = "[1]", destroyMethod = "[2]")
public MyBean myBean() {
    return new MyBean();
}

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

AcustomInit

BcustomDestroy

Cinit

Ddestroy

Attempts:

3 left

💡 Hint

Common Mistakes

Using default method names instead of custom ones.

Mixing up init and destroy method names.

The initMethod and destroyMethod specify custom methods to run during bean lifecycle events.

5fill in blank

hard

Fill all three blanks to create a bean with lifecycle annotations.

Spring Boot

public class MyBean {

    @[1]
    public void start() {
        System.out.println("Bean started");
    }

    @[2]
    public void stop() {
        System.out.println("Bean stopped");
    }

    @[3]
    public void cleanup() {
        System.out.println("Bean cleaned up");
    }
}

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

APostConstruct

BPreDestroy

CPreDestroyMethod

DPostDestroy

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent annotations like @PreDestroyMethod or @PostDestroy.

Mixing up PostConstruct and PreDestroy.

The @PostConstruct annotation marks a method to run after bean creation. @PreDestroy marks a method before destruction. @PreDestroyMethod is incorrect; the correct annotation is @PreDestroy, so this is a trick option to test attention.