@Configuration and @Bean in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to mark the class as a configuration class.

Spring Boot

@[1]
public class AppConfig {
}

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

AService

BComponent

CConfiguration

DRepository

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component instead of @Configuration

Forgetting the '@' symbol

Using unrelated annotations like @Service

The @Configuration annotation marks the class as a source of bean definitions for the Spring container.

2fill in blank

medium

Complete the code to define a bean method that returns a new instance of MyService.

Spring Boot

@Bean
public MyService [1]() {
    return new MyService();
}

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AcreateService

BmyService

CserviceBean

DgetService

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid method names

Forgetting to add @Bean annotation

Returning null instead of new instance

The method name myService is used as the bean name by default.

3fill in blank

hard

Fix the error in the bean method declaration by completing the missing annotation.

Spring Boot

@[1]
public MyRepository [2]() {
    return new MyRepository();
}

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A@Repository

B@Service

CmyRepository

D@Bean

Attempts:

3 left

💡 Hint

Common Mistakes

Using class-level annotations on methods

Omitting the @Bean annotation

Using @Component on methods instead of classes

The @Bean annotation is required on methods inside @Configuration classes to register beans. Also, the method needs a name.

4fill in blank

hard

Fill both blanks to complete the configuration class with a bean method.

Spring Boot

@[1]
public class ServiceConfig {
    @[2]
    public UserService userService() {
        return new UserService();
    }
}

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

AConfiguration

BComponent

CBean

DService

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up class and method annotations

Using @Component instead of @Configuration on class

Forgetting @Bean on method

The class must be annotated with @Configuration and the method with @Bean to define a bean.

5fill in blank

hard

Fill all three blanks to create a configuration class with two bean methods.

Spring Boot

@[1]
public class AppBeans {
    @[2]
    public ServiceA serviceA() {
        return new ServiceA();
    }

    @[3]
    public ServiceB serviceB() {
        return new ServiceB();
    }
}

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

AConfiguration

BBean

CComponent

DService

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component on class instead of @Configuration

Forgetting @Bean on one or both methods

Using @Service on methods

The class uses @Configuration, and each bean method uses @Bean to register beans.