Annotate Required Field Bulletin For Free

The @Valid annotation ensures that the entity class is validated at runtime. Additional user-defined constraints can also trigger validation of an entity. @Path("/createUser") public class CreateUserResource { ...

The @Valid annotation is a key feature of Bean Validation, as it allows to validate object graphs with a single call to the validator. To make use of it all fields that should be recursively checked should be annotated with @Valid .

When Spring Boot finds an argument annotated with @Valid, it automatically bootstraps the default JSR 380 implementation ? Hibernate Validator ? and validates the argument. When the target argument fails to pass the validation, Spring Boot throws a MethodArgumentNotValidException exception.

The @Valid annotation applies validation rules on the provided object. The BindingResult interface contains the result of validation.

When Spring Boot finds an argument annotated with @Valid, it automatically bootstraps the default JSR 380 implementation ? Hibernate Validator ? and validates the argument. When the target argument fails to pass the validation, Spring Boot throws a MethodArgumentNotValidException exception.

The @Validated annotation is a class-level annotation that we can use to tell Spring to validate parameters that are passed into a method of the annotated class.

@Valid annotation is nothing to do with Spring because it is not a part of the Spring framework. It is a part of Bean Validation specification but @Valid is very old and derives all the way from JSR 303. What it does is basically checks if the data that you send to the controller method is valid or not.