Keeping Your Data Sane with Bean Validation 2.0 Gunnar Morling, Red Hat 1 

Agenda What is Bean Validation? What's new in Bean Validation 2.0? Questions, feedback 2 

Gunnar Morling Open source software engineer at Red Hat Hibernate Debezium Spec Lead for Bean Validation 2.0 Other projects: ModiTect, MapStruct [email protected] @gunnarmorling http://in.relation.to/gunnar-morling/ 3 

What is Bean Validation? "Constraint once, validate everywhere" Constraints for JavaBeans Validation via API or automatically ​ JPA JSF, Spring MVC, GWT JAX-RS Extensible (custom constraints) BV 1.1: ​ method validation 4 

Demo 5 

Bean Validation 2.0 - JSR 380 Benefit from new language features Support for API extensions 6 

Use Case: Different Passwords for Different Roles @Size.List({ @Size(min = 8, group = Default.class), @Size(min = 12, group = Admin.class) }) private char[] password = ...; 7 

Use Case: Different Passwords for Different Roles @Size.List({ @Size(min = 8, group = Default.class), @Size(min = 12, group = Admin.class) }) private char[] password = ...; @Size(min = 8, group = Default.class) @Size(min = 12, group = Admin.class) private char[] password = ...; 8 

Use Case: Ensure Non-Empty Collection Elements private List names; 9 

Use Case: Ensure Non-Empty Collection Elements private List names; @NotEmpty private List names; 10 

Use Case: Ensure Non-Empty Collection Elements private List names; @OnElements(constraint=@NotEmpty) private List names; 11 

Use Case: Ensure Non-Empty Collection Elements private List names; private List<@NotEmpty String> names; @OnElements(constraint=@NotEmpty) private List names; 12 

Use Case: Ensure Non-Empty Collection Elements private List names; private List<@NotEmpty @Pattern(regexp="[a-zA-Z]*") String> names; @OnElements(constraint=@NotEmpty) private List names; 13 

private List<@NotEmpty @Pattern(regexp="[a-zA-Z]*") String> names; Use Case: Ensure Non-Empty Collection Elements private List names; @NotEmpty private List<@NotEmpty String> names; @OnElements(constraint=@NotEmpty) private List names; 14 

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE }) @Retention(RUNTIME) @Repeatable(List.class) @Documented @Constraint(validatedBy = { }) public @interface Size { ... } Type Annotations (JSR 308) New element type TYPE_USE 15 

Cascaded Validation @Valid private List

addresses; 16 

Cascaded Validation @Valid private List

addresses; private List<@Valid Address> addresses; 17 

Cascaded Validation @Valid private List

addresses; private List<@Valid Address> addresses; private Map<@Valid Comment, Integer> scorePerComment; 18 

Cascaded Validation @Valid private List

addresses; private List<@Valid Address> addresses; private Map<@Valid Comment, Integer> scorePerComment; private Map<@Valid AddressType, List<@Valid Address>> addressesByType; 19 

Further Supported Containers Optional, OptionalInt, OptionalLong, OptionalDouble JavaFX's property types Optional<@Email String> getEmail() { ... }; 20 

Custom Containers Specific collection types (e.g. Google Guava) Other JVM languages (Ceylon, Scala etc.) Enabled via Extractor SPI private Table revenuePerYearAndCategory; 21 

private Table revenuePerYearAndCategory; private Table revenuePerYearAndCategory; Custom Containers Specific collection types (e.g. Google Guava) Other JVM languages (Ceylon, Scala etc.) Enabled via Extractor SPI 22 

Demo 23 

class TableValueExtractor implements ValueExtractor> { @Override public void extractValues(Table originalValue, ValueExtractor.ValueReceiver receiver) { for ( Cell cell : originalValue.cellSet() ) { receiver.keyedValue( "", new CellKey( cell.getRowKey(), cell.getColumnKey() ), cell.getValue() ); } } } 24 

Use Case: Delivery Date in the Future @Past/@Future supported for JSR 310 types: java.time.LocalDateTime, ZonedDateTime etc. @Future private LocalDate deliveryDate = LocalDate.of( 2017, Month.MAY, 12 ); 25 

Use Case: Delivery Date in the Future @Past/@Future supported for JSR 310 types: java.time.LocalDateTime, ZonedDateTime etc. @Future(orPresent=true) private LocalDate deliveryDate = LocalDate.of( 2017, Month.MAY, 12 ); @Future private LocalDate deliveryDate = LocalDate.of( 2017, Month.MAY, 12 ); 26 

Use Case: Testing ValidatorFactory vf = Validation.byDefaultProvider() .configure() .clockProvider( new FixedClockProvider( ZonedDateTime.of( 2016, 6, 15, 0, 0, 0, 0, ZoneId.of( "Europe/Paris" ) ) ) ) .buildValidatorFactory(); 27 

Other Java 8 Goodies Real parameter names in error messages ConstraintValidator without initialize() public class NotNullValidator implements ConstraintValidator { public void initialize(NotNull constraintAnnotation) {} public boolean isValid(Object object, ConstraintValidatorContext ctx) { return object != null; } } public class NotNullValidator implements ConstraintValidator { public boolean isValid(Object object, ConstraintValidatorContext ctx) { return object != null; } } 28 

New Constraints @NotEmpty, @NotBlank @Email @Positive, @PositiveOrZero , @Negative, @NegativeOrZero 29 

Status Passed Public Review Ballot last week 30 

Next Steps Proposed Final Draft this week Reference implementation: Hibernate Validator 6.0 Beta2 Your feedback is needed :-) Part of Java EE 8 (July 2017) 31 

Outlook Bean Validation 2.1 Constraint-API mapping.constraintDefinition( FileExists.class ) .validateType( File.class ) .with( f -> f.exists() ); Constraint-API: Lambda ConstraintMapping mapping = ...; mapping.type( Marathon.class ) .property( "numberOfHelpers", FIELD ) .constraint( new MinDef().value( 1 ) ) .property( "runners", METHOD ) .valid(); 32 

Resources All changes Reference implementation API, specifikation, TCK, website Everything is open source @gunnarmorling http://beanvalidation.org/latest-draft/diff-to-1.1/ github.com/hibernate/hibernate-validator/ github.com/beanvalidation/ 33 

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