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Neues in Bean Validation 2.0 - Support für Java...
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Gunnar Morling
September 29, 2017
Programming
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120
Neues in Bean Validation 2.0 - Support für Java 8 und mehr
Slides from a talk on the new features in Bean Validation 2.0, given at code.talks 2017 (German).
Gunnar Morling
September 29, 2017
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Transcript
Neues in Bean Validation 2.0 Support für Java 8 und
mehr Gunnar Morling, Red Hat @gunnarmorling 1
Agenda Was ist Bean Validation? Was gibt's Neues in Bean
Validation 2.0? Fragen 2
Gunnar Morling Opensource-Softwareentwickler bei Red Hat Debezium Hibernate Spec Lead
für Bean Validation 2.0 Andere Projekte: ModiTect, MapStruct
[email protected]
@gunnarmorling http://in.relation.to/gunnar-morling/ 3
Was ist Bean Validation? "Constrain once, validate everywhere" Constraints für
JavaBeans Validierung per API oder automatisch JPA JSF, Spring MVC, GWT JAX-RS Erweiterbar BV 1.1: Methodenvalidierung 4
Demo 5
Bean Validation 2.0 - JSR 380 Nutzung der neuen Sprachfeatures
von Java 8 Unterstützung der neuen APIs 6
Use Case: Passwortvalidierung basierend auf Nutzerrolle @Size.List({ @Size(min = 8,
group = Default.class), @Size(min = 12, group = Admin.class) }) private char[] password = ...; 7
@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 = ...; Use Case: Passwortvalidierung basierend auf Nutzerrolle 8
Use Case: Nicht-leere Listenelemente sicherstellen private List<String> names; 9
private List<String> names; @NotEmpty private List<String> names; Use Case: Nicht-leere
Listenelemente sicherstellen 10
private List<String> names; @OnElements(constraint=@NotEmpty) private List<String> names; Use Case: Nicht-leere
Listenelemente sicherstellen 11
private List<String> names; private List<@NotEmpty String> names; @OnElements(constraint=@NotEmpty) private List<String>
names; Use Case: Nicht-leere Listenelemente sicherstellen 12
private List<String> names; private List<@NotEmpty @Pattern(regexp="[a-zA-Z]*") String> names; @OnElements(constraint=@NotEmpty) private
List<String> names; Use Case: Nicht-leere Listenelemente sicherstellen 13
private List<@NotEmpty @Pattern(regexp="[a-zA-Z]*") String> names; private List<String> names; @NotEmpty private
List<@NotEmpty String> names; @OnElements(constraint=@NotEmpty) private List<String> names; Use Case: Nicht-leere Listenelemente sicherstellen 14
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE }) @Retention(RUNTIME) @Repeatable(List.class)
@Documented @Constraint(validatedBy = { }) public @interface Size { ... } Typannotationen (JSR 308) Neuer Elementtyp TYPE_USE 15
Kaskadierende Validierung @Valid private List<Address> addresses; 16
@Valid private List<Address> addresses; private List<@Valid Address> addresses; Kaskadierende Validierung
17
@Valid private List<Address> addresses; private List<@Valid Address> addresses; private Map<@Valid
Comment, Integer> scorePerComment; Kaskadierende Validierung 18
@Valid private List<Address> addresses; private List<@Valid Address> addresses; private Map<@Valid
Comment, Integer> scorePerComment; private Map<@Valid AddressType, List<@Valid Address>> addressesByType; Kaskadierende Validierung 19
Weitere unterstützte Container Optional, OptionalInt, OptionalLong, OptionalDouble Propertytypen von JavaFX
Optional<@Email String> getEmail() { ... }; 20
Eigene Container Spezifische Kollektionstypen (z.B. Google Guava) Andere JVM-Sprachen (Ceylon,
Scala etc.) Unterstützt per Extractor SPI private Table<Year, String, Integer> revenuePerYearAndCategory; 21
private Table<Year, String, Integer> revenuePerYearAndCategory; private Table<Year, String, @Positive Integer>
revenuePerYearAndCategory; Eigene Container Spezifische Kollektionstypen (z.B. Google Guava) Andere JVM-Sprachen (Ceylon, Scala etc.) Unterstützt per Extractor SPI 22
Demo 23
Use Case: Lieferdatum in der Zukunft @Past/@Future unterstützen JSR-310-Typen: java.time.LocalDateTime,
ZonedDateTime etc. @Future private LocalDate deliveryDate = LocalDate.of( 2017, Month.MAY, 12 ); 24
@FutureOrPresent private LocalDate deliveryDate = LocalDate.of( 2017, Month.MAY, 12 );
@Future private LocalDate deliveryDate = LocalDate.of( 2017, Month.MAY, 12 ); Use Case: Lieferdatum in der Zukunft @Past/@Future unterstützen JSR-310-Typen: java.time.LocalDateTime, ZonedDateTime etc. 25
Use Case: Testen ValidatorFactory vf = Validation.byDefaultProvider() .configure() .clockProvider( new
FixedClockProvider( ZonedDateTime.of( 2016, 6, 15, 0, 0, 0, 0, ZoneId.of( "Europe/Paris" ) ) ) ) .buildValidatorFactory(); 26
Neue Constraints @NotEmpty, @NotBlank @Email @Positive, @PositiveOrZero , @Negative, @NegativeOrZero
@PastOrPresent, @FutureOrPresent 27
Andere Java 8 Goodies Parameternamen in Fehlermeldungen ConstraintValidator ohne initialize()
public class NotNullValidator implements ConstraintValidator<NotNull, Object> { public void initialize(NotNull constraintAnnotation) {} public boolean isValid(Object object, ConstraintValidatorContext ctx) { return object != null; } } public class NotNullValidator implements ConstraintValidator<NotNull, Object> { public boolean isValid(Object object, ConstraintValidatorContext ctx) { return object != null; } } 28
Status Final seit August Referenzimplementierung: Hibernate Validator 6.0 29
Finale Version Teil von Java EE 8 Enthalten in GlassFish
5; Patch für WildFly Unterstützt durch Spring 5 Alles ist Open Source: Spezifikation, API, TCK und RI 30
Resourcen Spezifikation Referenzimplementierung API, Spezifikation, TCK, Website @gunnarmorling http://beanvalidation.org/2.0/spec/ github.com/hibernate/hibernate-validator/
github.com/beanvalidation/ 31
32
Ausblick 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(); 33