@SpringBootApplication breakdown - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to mark the main class as a Spring Boot application.

Spring Boot

@[1]
public class MyApp {
    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
}

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

AComponentScan

BSpringBootApplication

CEnableAutoConfiguration

DConfiguration

Attempts:

3 left

💡 Hint

Common Mistakes

Using only @Configuration instead of @SpringBootApplication

Forgetting to annotate the main class

The @SpringBootApplication annotation marks the main class as a Spring Boot application. It combines several important annotations.

2fill in blank

medium

Complete the code to enable component scanning in a Spring Boot app.

Spring Boot

@ComponentScan(basePackages = {"[1]"})
public class AppConfig {}

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Acom.example.app

Bjavax.servlet

Cjava.util

Dorg.springframework.boot

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated package names

Leaving the package empty

Component scanning looks for components in the specified package. Usually, you scan your app's base package.

3fill in blank

hard

Fix the error in the annotation to enable auto-configuration.

Spring Boot

@Enable[1]
public class Config {}

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AAutoConfiguration

BConfiguration

CComponentScan

DSpringBootApplication

Attempts:

3 left

💡 Hint

Common Mistakes

Using @EnableConfiguration instead

Confusing with @ComponentScan

The @EnableAutoConfiguration annotation tells Spring Boot to automatically configure beans based on classpath settings.

4fill in blank

hard

Fill both blanks to complete the combined annotation equivalent to @SpringBootApplication.

Spring Boot

@Configuration
@[1]
@[2]
public class App {}

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AEnableAutoConfiguration

BComponentScan

CSpringBootApplication

DEnableScheduling

Attempts:

3 left

💡 Hint

Common Mistakes

Using @EnableScheduling instead of @ComponentScan

Missing one of the annotations

The @SpringBootApplication annotation combines @Configuration, @EnableAutoConfiguration, and @ComponentScan.

5fill in blank

hard

Fill all three blanks to explain what @SpringBootApplication does internally.

Spring Boot

The @SpringBootApplication annotation is a shortcut for:
@Configuration
@[1]
@[2]
It also enables [3] scanning.

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AEnableAutoConfiguration

BComponentScan

Cauto

DEnableScheduling

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing scheduling with auto-configuration

Missing the component scan part

@SpringBootApplication combines @EnableAutoConfiguration and @ComponentScan, and it enables auto scanning of components.