What is Spring Boot in Spring Boot - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic Spring Boot application 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);
    }
}

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

Astart

Brun

Claunch

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

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

Forgetting to call a method to start the app.

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

2fill in blank

medium

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

Spring Boot

import org.springframework.boot.autoconfigure.SpringBootApplication;

@[1]
public class MyApp {}

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ASpringBootApp

BComponentScan

CEnableAutoConfiguration

DSpringBootApplication

Attempts:

3 left

💡 Hint

Common Mistakes

Using only @EnableAutoConfiguration misses component scanning.

Using wrong annotation names causes the app not to start.

The @SpringBootApplication annotation marks the main class as a Spring Boot app.

3fill in blank

hard

Fix the error in the code to correctly inject a service in Spring Boot.

Spring Boot

import org.springframework.stereotype.Service;
import org.springframework.beans.factory.annotation.[1];

@Service
public class MyService {
    // service methods
}

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AComponent

BInject

CAutowired

DResource

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Inject requires extra setup and is not default in Spring Boot.

Using @Component on a field is incorrect.

The @Autowired annotation is used to inject dependencies in Spring Boot.

4fill in blank

hard

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

Spring Boot

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

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

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ARestController

BGetMapping

CController

DPostMapping

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Controller instead of @RestController requires extra setup.

Using @PostMapping instead of @GetMapping changes the HTTP method.

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

5fill in blank

hard

Fill all three blanks to define a Spring Boot application with a service and controller.

Spring Boot

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.stereotype.Service;
import org.springframework.beans.factory.annotation.Autowired;

@SpringBootApplication
public class [1] {
    public static void main(String[] args) {
        SpringApplication.[2]([3].class, args);
    }
}

@Service
class GreetingService {
    public String greet() {
        return "Hello from service!";
    }
}

@RestController
class GreetingController {
    private final GreetingService service;

    @Autowired
    public GreetingController(GreetingService service) {
        this.service = service;
    }

    @GetMapping("/greet")
    public String greet() {
        return service.greet();
    }
}

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AApplication

Brun

CMyApp

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using different class names in main and run causes errors.

Using 'start' instead of 'run' causes runtime errors.

The main class is named Application, and SpringApplication.run() starts it.