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JBoss Enterprise Application Platform Common Criteria Certification
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Hibernate Validator Reference Guide
1.2. Built in constraints

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1.2. Built in constraints

Hibernate Validator comes with some built-in constraints, which covers most basic data checks. As we'll see later, you're not limited to them, you can literally in a minute write your own constraints.

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Table 1.1. Built-in constraints
Annotation	Apply on	Runtime checking	Hibernate Metadata impact
@Length(min=, max=)	property (String)	check if the string length match the range	Column length will be set to max
@Max(value=)	property (numeric or string representation of a numeric)	check if the value is less than or equals to max	Add a check constraint on the column
@Min(value=)	property (numeric or string representation of a numeric)	check if the value is more than or equals to min	Add a check constraint on the column
@NotNull	property	check if the value is not null	Column(s) are not null
@NotEmpty	property	check if the string is not null nor empty. Check if the connection is not null nor empty	Column(s) are not null (for String)
@Past	property (date or calendar)	check if the date is in the past	Add a check constraint on the column
@Future	property (date or calendar)	check if the date is in the future	none
@Pattern(regex="regexp", flag=) or @Patterns( {@Pattern(...)} )	property (string)	check if the property match the regular expression given a match flag (see `java.util.regex.Pattern` )	none
@Range(min=, max=)	property (numeric or string representation of a numeric)	check if the value is between min and max (included)	Add a check constraint on the column
@Size(min=, max=)	property (array, collection, map)	check if the element size is between min and max (included)	none
@AssertFalse	property	check that the method evaluates to false (useful for constraints expressed in code rather than annotations)	none
@AssertTrue	property	check that the method evaluates to true (useful for constraints expressed in code rather than annotations)	none
@Valid	property (object)	perform validation recursively on the associated object. If the object is a Collection or an array, the elements are validated recursively. If the object is a Map, the value elements are validated recursively.	none
@Email	property (String)	check whether the string is conform to the email address specification	none
@CreditCardNumber	property (String)	check whether the string is a well formated credit card number (derivative of the Luhn algorithm)	none
@Digits(integerDigits=1)	property (numeric or string representation of a numeric)	check whether the property is a number having up to `integerDigits` integer digits and `fractionalDigits` fractonal digits	define column precision and scale
@EAN	property (string)	check whether the string is a properly formated EAN or UPC-A code	none

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