Validation groups in Spring Boot - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are validation groups in Spring Boot?

Validation groups let you organize validation rules into sets. You can apply different rules in different situations by specifying which group to use.

beginner

How do you define a validation group in Spring Boot?

You create an empty interface to mark a group. For example:

public interface CreateGroup {}

This interface is used to tag validation annotations.

intermediate

How do you apply a validation group to a constraint annotation?

Add the groups attribute to the annotation with the group interface. Example:

@NotNull(groups = CreateGroup.class)

This means the rule runs only when validating the CreateGroup.

intermediate

How do you trigger validation for a specific group in Spring Boot controller?

Use @Validated(GroupName.class) on the method parameter. Example:

public ResponseEntity create(@Validated(CreateGroup.class) @RequestBody User user)

This runs validations for CreateGroup only.

beginner

Why use validation groups instead of one big validation set?

Validation groups let you reuse the same object with different rules for different actions, like creating or updating. This keeps validations clear and avoids conflicts.

What is the purpose of validation groups in Spring Boot?

A To organize validation rules for different scenarios

B To disable validation completely

C To automatically fix validation errors

D To generate database tables

Validation groups help organize and apply different validation rules depending on the use case.

How do you mark a validation group in Spring Boot?

A By writing XML configuration

B By creating a class with methods

C By adding annotations to the main class

D By creating an empty interface

Validation groups are defined as empty interfaces used as markers.

Which annotation attribute specifies the validation group for a constraint?

A groups

B target

C scope

D category

The 'groups' attribute on constraint annotations defines which validation groups apply.

How do you activate validation for a specific group in a controller method parameter?

A @Valid

B @Validated(Group.class)

C @Autowired

D @RequestMapping

Use @Validated with the group class to trigger group-specific validation.

What happens if you don't specify a validation group when validating?

A All groups run

B No validations run

C Default group validations run

D Validation throws an error

If no group is specified, the default validation group is used.

Explain how validation groups help manage different validation rules in Spring Boot.

Think about how you might want different rules when adding or editing data.

Describe the steps to create and use a validation group for a 'Create' operation in Spring Boot.

Start from defining the group, then tagging constraints, then activating validation.