Snippet

Method-Level Validation with @Validated

Spring supports JSR-303 Bean Validation at the method level. By adding @Validated to the class, Spring will throw a ConstraintViolationException if parameters are invalid.

snippet.java

java

@Service
@Validated
public class UserService {
    public void updateUser(@NotBlank String username, @Min(18) int age) {
        // Logic to update user
    }
}

spring

Breakdown

@Validated

Enables constraint checking for method parameters within this component.

@NotBlank String username

Ensures the username is not null and contains at least one non-whitespace character.

@Min(18) int age

Requires the age parameter to be at least 18.

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Method-Level Validation with @Validated

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