@Size for length constraints in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a minimum length of 5 characters using @Size.

Spring Boot

@Size(min = [1])
private String username;

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

A3

B10

C0

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using max instead of min for minimum length.

Setting the value too low or zero when a minimum is needed.

The @Size annotation's min attribute sets the minimum length allowed. Here, 5 means the string must have at least 5 characters.

2fill in blank

medium

Complete the code to set a maximum length of 20 characters using @Size.

Spring Boot

@Size(max = [1])
private String password;

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A10

B20

C30

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing min and max attributes.

Setting a maximum length smaller than the minimum length.

The max attribute in @Size sets the maximum allowed length. Here, 20 means the string cannot exceed 20 characters.

3fill in blank

hard

Fix the error in the @Size annotation to require a length between 3 and 15 characters.

Spring Boot

@Size(min = 3, max = [1])
private String nickname;

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A15

B5

C10

D20

Attempts:

3 left

💡 Hint

Common Mistakes

Setting max less than min causing validation errors.

Using incorrect numbers that don't match the requirement.

The max attribute should be 15 to set the upper limit of the allowed length range.

4fill in blank

hard

Fill both blanks to require a string length between 8 and 25 characters.

Spring Boot

@Size(min = [1], max = [2])
private String description;

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A8

B10

C25

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping min and max values.

Choosing numbers outside the required range.

The min attribute is 8 and the max attribute is 25 to set the allowed length range.

5fill in blank

hard

Fill all three blanks to require a string length between 4 and 12 characters and add a custom error message.

Spring Boot

@Size(min = [1], max = [2], message = "[3]")
private String title;

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A4

B12

CLength must be between 4 and 12 characters

DLength should be at least 5

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to add the message attribute.

Using incorrect numbers for min or max.

Writing a message that does not match the length constraints.

The min is 4, max is 12, and the message provides a clear error message for validation failures.