Data Validation with JSR-303

Introduced Java Bean Validation 
 Part of JEE 6 and above, suported by Spring since version 3 
 Set of annotations used to validate Java Bean properties 
 
 JSR 380 - Bean Validation 2.0 
 
 Added to Spring Framework 5.0 
 Available in Spring Boot 2.0.0+ 
 Uses Hibnernate Validatior 6.0+ 
 Primary goal of Bean Validation 2.0 is Java 8 language features 
 Added 11 new built in validation annotations 
 
 Built in Contstraint Definitions 
 
 @Null - Checks value is null 
 @NotNull - Checks value is not null 
 @AssertTrue - Value is true 
 @AssertFalse - What do you think? 
 @Min - Number is equal to or higher 
 @Max - Number is equal to or less 
 @DecimalMin - Value is larger 
 @DecimalMax - Value is less than 
 @Negative - Value is less than zero. Zero invalid 
 @NegativeOrZero - Value is less than or zero. 
 @Positive 
 @PositiveOrZero 
 @Size - Checks if string or collection is between a min and max 
 @Digits - checks for integer digits and fraction digits 
 @Past - Checks if a date is in the past 
 @PastOrPresent 
 @Future 
 @FutureOrPresent 
 @Pattern - Checks against RegEx pattern 
 @NotEmpty - Checks if value is null or empty (whitespace or empty collection) 
 @NonBlank - Checks string is not null or not whitespace characters 
 @Email - Checks if string value is an email address 
 
 Hibernate Validator Constraints 
 
 @ScriptAssert - Class level annotation, checks class against script 
 @CreditCardNumber - Verifies value is a credit card number 
 @Currency - Valid currency ammount 
 @DurationMax - Duration less than given value 
 @DurationMin - Duration more than given value 
 @EAN - Valid EAN barcode 
 @ISBN - Valid ISBN value 
 @Length - String length between given min and max 
 @CodePointLength - Validates that code point length of the annotated character sequence is between min and max 
 @LuhnCheck - Luhn check sum 
 @Mod10Check - Mod 10 check sum 
 @Mod11Check - Mod 11 check sum 
 @Range - Checks if a number is between min and max (exlusive) 
 @Safehtml - Checks for safe HTML 
 @UniqueElements - Checks if collection has unqiue elements 
 @Url - Checks for valid URL