List of constraint annotations supported by CUBA studio

Annotation	Types (Standard for CUBA entities)	Note
@NotNull	All	The annotated element must not be null.
@Length	String	Validate that the string is between min and max included.
@Pattern	String	The annotated String must match the specified regular expression.
@Email	String	Checks that the string has to be a well-formed email address.
@Min	Integer, Long	A number whose value must be higher or equal to the specified minimum.
@Max	Integer, Long	A number whose value must be lower or equal to the specified maximum.
@Digits	BigDecimal, Double, Integer, Long	Sets the max number of integer and fractional digits of the number.
@DecimalMin	BigDecimal, Double	Same as @Min but you can specify fractional part and set `inclusive` flag.
@DecimalMax	BigDecimal, Double	Same as @Max but you can specify fractional part and set `inclusive` flag.
@Past	Date, DateTime	Element must be a date in the past.
@Future	Date, DateTime	Element must be a date in the future.

Other useful annotations

Annotation	Types	Note
@Size	CharSequence, Collection , Map, array	The annotated element size must be between the specified boundaries (included).
@Valid	Reference fields	Marks reference field for cascade validation. Documentation.
@RequiredView	Service method and it's parameters	Ensures that entity instances are loaded with all the attributes specified in the view. Documentation.
@Validated	Middleware services methods	Marks middleware methods parameters and return data for validation. See documentation for details.