@RestController annotation in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a REST controller class in Spring Boot.

Spring Boot

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

@[1]
public class HelloController {
    // controller methods
}

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

AService

BRestController

CComponent

DRepository

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Service or @Component instead of @RestController

Forgetting to import the annotation

The @RestController annotation marks the class as a REST controller in Spring Boot.

2fill in blank

medium

Complete the code to create a GET endpoint that returns a greeting string.

Spring Boot

@RestController
public class GreetingController {

    @[1]("/greet")
    public String greet() {
        return "Hello!";
    }
}

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AGetMapping

BPostMapping

CRequestMapping

DDeleteMapping

Attempts:

3 left

💡 Hint

Common Mistakes

Using @PostMapping for a GET request

Not specifying the path in the annotation

The @GetMapping annotation maps HTTP GET requests to the method.

3fill in blank

hard

Fix the error in the code by completing the annotation to handle POST requests.

Spring Boot

@RestController
public class DataController {

    @[1]("/data")
    public String saveData() {
        return "Data saved";
    }
}

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APatchMapping

BPutMapping

CGetMapping

DPostMapping

Attempts:

3 left

💡 Hint

Common Mistakes

Using @GetMapping for POST requests

Using incorrect HTTP method annotations

The @PostMapping annotation is used to handle HTTP POST requests.

4fill in blank

hard

Fill both blanks to create a REST controller with a GET endpoint returning JSON.

Spring Boot

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

@[1]
public class UserController {

    @[2]("/user")
    public User getUser() {
        return new User("Alice", 30);
    }
}

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

ARestController

BService

CGetMapping

DPostMapping

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Service instead of @RestController

Using @PostMapping for a GET endpoint

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

5fill in blank

hard

Fill both blanks to create a REST controller with a POST endpoint that accepts JSON and returns a confirmation string.

Spring Boot

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

@[1]
public class OrderController {

    @[2]("/order")
    public String placeOrder(@RequestBody Order order) {
        return "Order placed for " + order.getItem();
    }
}

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

ARestController

BPostMapping

CGetMapping

DService

Attempts:

3 left

💡 Hint

Common Mistakes

Using @GetMapping for POST requests

Forgetting @RequestBody for JSON input

The class is marked with @RestController. The method uses @PostMapping to handle POST requests. The @RequestBody annotation binds the JSON request to the method parameter.