Why Spring Boot over plain Spring in Spring Boot - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a Spring Boot application main class.

Spring Boot

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

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Arun

Blaunch

Cstart

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' or 'launch' instead of 'run' causes errors.

The SpringApplication.run() method starts the Spring Boot application.

2fill in blank

medium

Complete the code to enable auto-configuration in Spring Boot.

Spring Boot

@[1]
public class MyApp {}

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AComponentScan

BEnableAutoConfiguration

CConfiguration

DSpringBootApplication

Attempts:

3 left

💡 Hint

Common Mistakes

Using only @EnableAutoConfiguration misses component scanning.

The @SpringBootApplication annotation includes auto-configuration, component scanning, and configuration.

3fill in blank

hard

Fix the error in the Spring Boot application properties file to set server port to 8081.

Spring Boot

server.[1]=8081

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Aport

Bhost

Caddress

Durl

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'server.host' or 'server.address' does not set the port.

The property server.port sets the port number for the Spring Boot embedded server.

4fill in blank

hard

Fill both blanks to create a REST controller with a GET mapping in Spring Boot.

Spring Boot

import org.springframework.web.bind.annotation.[1];
import org.springframework.web.bind.annotation.[2];

@[1]
public class HelloController {
    @[2]("/hello")
    public String sayHello() {
        return "Hello, Spring Boot!";
    }
}

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ARestController

BGetMapping

CController

DPostMapping

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Controller instead of @RestController misses automatic response body.

@RestController marks the class as a REST controller, and @GetMapping maps HTTP GET requests to the method.

5fill in blank

hard

Fill all three blanks to define a Spring Boot application with a component scan and enable configuration properties.

Spring Boot

import org.springframework.context.annotation.[1];
import org.springframework.context.annotation.Configuration;
import org.springframework.boot.context.properties.[2];

@[3]
@[1](
    scanBasePackages = {"com.example.app"}
)
@[2]
public class AppConfig {}

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AComponentScan

BEnableConfigurationProperties

CSpringBootApplication

DConfiguration

Attempts:

3 left

💡 Hint

Common Mistakes

Using @SpringBootApplication here would be simpler but this example shows separate annotations.

@ComponentScan tells Spring where to look for components, @EnableConfigurationProperties enables support for configuration properties, and @Configuration marks the class as a source of bean definitions.