Request validation preview in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a validation annotation that ensures the 'name' field is not empty.

Spring Boot

public class UserRequest {
    @[1]
    private String name;

    // getters and setters
}

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

ANotEmpty

BSize

CPattern

DEmail

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Size without specifying min value

Using @Email on a non-email field

The @NotEmpty annotation ensures the field is not null and not empty.

2fill in blank

medium

Complete the code to validate that the 'age' field is at least 18.

Spring Boot

public class UserRequest {
    @Min([1])
    private int age;

    // getters and setters
}

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

A18

B0

C21

D16

Attempts:

3 left

💡 Hint

Common Mistakes

Using a value less than 18

Confusing @Min with @Max

The @Min(18) annotation ensures the age is at least 18.

3fill in blank

hard

Fix the error in the validation annotation to ensure the 'email' field is a valid email address.

Spring Boot

public class UserRequest {
    @[1]
    private String email;

    // getters and setters
}

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

ANotBlank

BSize(min = 5)

CPattern(regexp = ".*@.*")

DEmail

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Pattern with incorrect regex

Using @NotBlank which only checks for non-empty

The @Email annotation validates that the string is a valid email format.

4fill in blank

hard

Fill both blanks to validate that the 'password' field is not null and has a minimum length of 8.

Spring Boot

public class UserRequest {
    @[1]
    @[2](min = 8)
    private String password;

    // getters and setters
}

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

ANotNull

BSize

CNotEmpty

DMin

Attempts:

3 left

💡 Hint

Common Mistakes

Using @NotEmpty instead of @NotNull

Using @Min instead of @Size for string length

@NotNull ensures the password is not null, and @Size(min = 8) ensures it has at least 8 characters.

5fill in blank

hard

Fill all three blanks to create a map of field names to their validation error messages using Spring's BindingResult.

Spring Boot

Map<String, String> errors = new HashMap<>();
for (FieldError error : bindingResult.getFieldErrors()) {
    errors.put(error.get[1](), error.get[2]());
}
return ResponseEntity.badRequest().body(errors.get([3]));

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

AField

BDefaultMessage

C"email"

DCode

Attempts:

3 left

💡 Hint

Common Mistakes

Using error.getCode() instead of getDefaultMessage()

Using wrong key to access the map

error.getField() gets the field name, error.getDefaultMessage() gets the error message, and the map is accessed with the field name "email".