Java EE 8新機能解説 -Bean Validation 2.0編-

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public class HelloDto {
@NotBlank(message = "{hello.notblank}")
private String message;
// getter/setter
}
@Path("/hello")
public class HelloResource {
@POST
public Response post(@Valid HelloDto helloDto) {
//
}
}

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hello.notblank =
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hello.notblank = Message is required
hello.notblank =
ValidationMessages_ja.properties
ValidationMessages_en.properties

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$ curl -v -X POST
-H "Content-Type: application/json”
-d ‘{"message":""}'
http://localhost:8080/api/hello
> POST /api/hello HTTP/1.1
> …
>
< HTTP/1.1 400 Bad Request
< …
<
{
"errorType":" ",
"messages":[" "]
}
※JSON ExceptionMapper

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Bean Validation

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▸ 👏
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▸ @NotNull
▸ @Null
▸ @NotEmpty
▸ @NotBlank
▸ @AssertTrue
▸ @AssertFalse
▸ @Size
▸ @Pattern
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▸ @Email
▸ @Digits
▸ @DecimalMax
▸ @DecimalMin
▸ @Max
▸ @Min
▸ @Positive
▸ @PositiveOrZero
▸ @Negative
▸ @NegativeOrZero
▸ @Past
▸ @PastOrPresent
▸ @Future
▸ @FutureOrPresent
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@NotBlank CharSequence
null
❌
@NotEmpty
 
null 0 ❌
@Email CharSequence
❌
@Positive ❌
@PositiveOrZero 0 ❌

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@Negative ❌
@NegativeOrZero 0 ❌
@PastOrPresent
Date Calendar
java.time.*

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@FutureOrPresent
Date Calendar
java.time.*

❌

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▸ @NotBlank @NotEmpty @Email 👏
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▸ @Past @PastOrPresent @Future
@FutureOrPresent
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▸ @Past  
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▸ @Max/@Positive  
javax.money.MonetaryAmount
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public class Sample {
private Optional<@Size(min = 3) String> optionalString;
private List<@NotNull String> list = new ArrayList<>();
// omitted
}
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※JSR Container element constraints

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▸ OptionalXxx java.util.OptionalInt  
XxxProperty IntegerProperty  
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public class Sample {
@Max(10)
private OptionalInt optionalInt;
// omitted
}

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@Test
public void test() {
Sample sample = new Sample();
sample.addToOptionalString(“aa"); // 3
sample.addToList(null); // not null
sample.addToOptionalInt(20); // 10
//
Set<ConstraintViolation<Sample>> violations =
validator.validate(sample);
//
assertEquals(3, violations.size());
}

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@Test
public void test2() {
Sample sample = new Sample();
sample.addToList(null); // not null 1
sample.addToList(null); // not null 2
//
Set<ConstraintViolation<Sample>> violations =
validator.validate(sample);
//
assertEquals(2, violations.size());
}
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@Max(value = 100, groups = Group1.class)
int someValue;
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@Max.List({
@Max(value = 100, groups = Group1.class),
})
int someValue;

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ParameterNameProvider
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▸ -parameters
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▸ ConstraintValidator
initialize()
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<web-app …>
<context-param>
<param-name>
javax.faces.validator.ENABLE_VALIDATE_WHOLE_BEAN
</param-name>
<param-value>true</param-value>
</context-param>

</web-app>

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public class EqualsValidator
implements ConstraintValidator<Equals, Object> {
@Override
public boolean isValid(Object obj,
ConstraintValidatorContext context) {
// 2
// true
}
@Constraint(validatedBy = EqualsValidator.class)
public @interface Equals {
String property1(); // 1
String property2(); // 2

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@Named
@ViewScoped
@Equals(property1 = "email1", property2 = "email2",
message = “…”)
public class CompareBean implements Serializable {
@NotBlank(message = “…”)
@Size(min = 3, message = “…”)
private String email1;
@NotBlank(message = “…”)
@Size(min = 3, message = “…”)
private String email2;
// omitted

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<h:form id="email-form">
<h:inputText value="#{compareBean.email1}"/><br/>
<h:inputText value="#{compareBean.email2}"/><br/>
<h:commandButton value=“ "
action="#{compareBean.submit()}"/>
<f:validateWholeBean value="#{compareBean}"/>
</h:form>
Managed Bean
※<f:validateBean/> validationGroups

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▸ <f:validateWholeBean>  
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<h:form id="email-form">
<h:inputText value=“…”/><br/>
<h:inputText value=“…”/><br/>
<h:commandButton value=“ " action=“…”/>
<f:validateWholeBean value="#{compareBean}"/>
</h:form>

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▸ @NotBlank @NotEmpty @Email
▸ Optional
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Java EE 8新機能解説 -Bean Validation 2.0編-

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