@Valid annotation on request body in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable validation on the request body parameter.

Spring Boot

public ResponseEntity<String> createUser(@[1] @RequestBody User user) { return ResponseEntity.ok("User created"); }

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AValid

BAutowired

CRequestParam

DPathVariable

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Autowired instead of @Valid

Forgetting to add @Valid before @RequestBody

Using @RequestParam or @PathVariable which are for different purposes

The @Valid annotation tells Spring Boot to validate the User object based on its validation annotations.

2fill in blank

medium

Complete the code to import the correct package for the @Valid annotation.

Spring Boot

import javax.[1].Valid;

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Avalidation.executable

Bvalidation

Cvalidation.metadata

Dvalidation.constraints

Attempts:

3 left

💡 Hint

Common Mistakes

Importing from javax.validation.constraints which is for specific constraint annotations

Importing from unrelated sub-packages

The @Valid annotation is in the javax.validation package.

3fill in blank

hard

Fix the error in the controller method to properly validate the request body.

Spring Boot

public ResponseEntity<String> updateUser(@RequestBody User user) { if(user.getName() == null) { return ResponseEntity.badRequest().body("Name is required"); } return ResponseEntity.ok("User updated"); } // Add [1] to enable automatic validation

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A@Validated

B@NotNull

C@RequestParam

D@Valid

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Validated instead of @Valid on method parameters

Not adding any validation annotation

Using @NotNull which is a constraint, not a validation trigger

Adding @Valid before @RequestBody triggers automatic validation of the User object.

4fill in blank

hard

Fill both blanks to create a controller method that validates the request body and returns a response.

Spring Boot

public ResponseEntity<String> addProduct([1] @RequestBody Product product) { if(product.getPrice() [2] 0) { return ResponseEntity.badRequest().body("Price must be positive"); } return ResponseEntity.ok("Product added"); }

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A@Valid

B>

C<=

D@Autowired

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Autowired instead of @Valid

Using <= instead of > for price check

Use @Valid to validate the product object and > to check if price is positive.

5fill in blank

hard

Fill all three blanks to create a method that validates a request body and uses a constraint annotation on the model.

Spring Boot

public ResponseEntity<String> registerUser(@[1] @RequestBody User user) { return ResponseEntity.ok("User registered"); } // In User class: private String email; @[2](message="Email is required") @[3] private String email;

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AValid

BNotNull

CEmail

DAutowired

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Autowired instead of @Valid

Swapping @NotNull and @Email

Forgetting constraint annotations on the model

Use @Valid on the method parameter, @NotNull to ensure email is not null, and @Email to check email format.