Why understanding request flow matters in Spring Boot - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Spring Boot controller method that handles GET requests.

Spring Boot

@RestController
public class HelloController {
    @GetMapping("/hello")
    public String sayHello() {
        return [1];
    }
}

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

A"Hello World"

BHello World

Creturn "Hello World"

DSystem.out.println("Hello World")

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the string

Using print statements instead of return

The method must return a string literal wrapped in quotes to send as the response body.

2fill in blank

medium

Complete the code to extract a path variable named 'id' in a Spring Boot controller method.

Spring Boot

@GetMapping("/item/[1]")
public String getItem(@PathVariable String id) {
    return "Item: " + id;
}

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

A:id

B<id>

C{id}

D(id)

Attempts:

3 left

💡 Hint

Common Mistakes

Using colon or angle brackets instead of braces

Mismatching variable names

Path variables in Spring Boot are defined with curly braces in the URL pattern.

3fill in blank

hard

Fix the error in the code to correctly map a POST request with a JSON body to a Java object.

Spring Boot

@PostMapping("/add")
public ResponseEntity<String> addItem([1] Item item) {
    // process item
    return ResponseEntity.ok("Added");
}

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

A@PathVariable

B@RequestParam

C@ResponseBody

D@RequestBody

Attempts:

3 left

💡 Hint

Common Mistakes

Using @PathVariable or @RequestParam instead of @RequestBody

Omitting the annotation

The @RequestBody annotation tells Spring Boot to convert the JSON request body into a Java object.

4fill in blank

hard

Fill both blanks to create a Spring Boot controller method that handles PUT requests and returns a ResponseEntity with status 204.

Spring Boot

@PutMapping("/update/[1]")
public ResponseEntity<Void> updateItem(@PathVariable String id, @RequestBody Item item) {
    // update logic
    return ResponseEntity.[2]();
}

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

A{id}

BnoContent

Cok

Dcreated

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong path variable syntax

Returning wrong ResponseEntity status

The path variable is marked with curly braces. Returning ResponseEntity.noContent() sends HTTP 204 status.

5fill in blank

hard

Fill all three blanks to create a Spring Boot controller method that handles DELETE requests, extracts an 'id' path variable, and returns a ResponseEntity with status 200 and a message.

Spring Boot

@DeleteMapping("/delete/[1]")
public ResponseEntity<String> deleteItem(@PathVariable String [2]) {
    // delete logic
    return ResponseEntity.[3]("Deleted item " + [2]);
}

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

Aid

Bok

CitemId

Dcreated

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatched variable names

Using wrong ResponseEntity status method

The path variable and method parameter must have the same name 'id'. ResponseEntity.ok() returns HTTP 200 with a message.