Spring Rest API Validation

https://jcp.org/en/jsr/detail?id=303

 @NotBlank(message = "username can't empty!")
    String username;

 @NotBlank

    @Size(min = 3, max = 50)

    private String username;

@NotEmpty

    @Length(max = 140)

    private String text;

ConstraintComposition	Boolean operator that is applied to all constraints of a composing constraint annotation.
CreditCardNumber	The annotated element has to represent a valid credit card number.
CreditCardNumber.List	Defines several @CreditCardNumber annotations on the same element.
Email	The string has to be a well-formed email address.
Email.List	Defines several @Email annotations on the same element.
Length	Validate that the string is between min and max included.
Length.List	Defines several @Length annotations on the same element.
NotBlank	Validate that the annotated string is not null or empty.
NotBlank.List	Defines several @NotBlank annotations on the same element.
NotEmpty	Asserts that the annotated string, collection, map or array is not null or empty.
NotEmpty.List	Defines several @NotEmpty annotations on the same element.
Range	The annotated element has to be in the appropriate range.
Range.List	Defines several @Range annotations on the same element.
SafeHtml	Validate a rich text value provided by the user to ensure that it contains no malicious code, such as embedded