使用 @NotEmpty 验证 Scala 的 Map 时抛出 javax.validation.UnexpectedTypeException: HV000030 异常

Question

当我尝试验证 Scala 的 Map 时，无论可变还是不可变，我都会遇到如下异常：

javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.Size' validating type 'scala.collection.mutable.Map<java.lang.String, java.lang.String>'. Check configuration for 'corporationSecrets'
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.throwExceptionForNullValidator(ConstraintTree.java:229) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:310) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateComposingConstraints(ConstraintTree.java:398) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:98) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:621) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:584) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:528) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:496) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:461) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:411) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:208) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
    at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:102) ~[spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at org.springframework.validation.DataBinder.validate(DataBinder.java:877) ~[spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:274) ~[spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
    at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:240) ~[spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
    at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:330) ~[spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
    ... 29 common frames omitted

我的代码很简单，喜欢

@NotEmpty
val corporationSecrets : scala.collection.mutable.Map[String, String] = new scala.collection.mutable.HashMap[String, String]

如何验证 scala 的映射以检查它是否为空？

Answer 1

所以你必须明白的是，在 Hibernate Validator 中，对于给定的约束，你为不同类型注册约束验证器。

通常，对于@Size约束，我们将为String，Collection，Map，数组...注册约束验证器

这里遇到的问题是 Scala 类型没有实现经典的 Java 接口，因此我们找不到它们的约束验证器。这就是为什么你会得到异常：HV 识别约束，但找不到约束验证器将其应用到 Scala 映射上。

据我从代码中看到，https://github.com/bean-validation-scala/bean-validation-scala 将是获得 Scala 的 BV 和 HV 支持的方法。它将验证委托给原始 HV 实现，因此您应该具有与 Java 所做的非常相似的行为。

我不认为它已经过时，因为请记住，在我们开始 BV 2.0 和 HV 6.0 的工作之前，BV/HV 项目有一段时间没有发生太大变化。向原作者询问 BV 2.0 和 HV 6.0 支持可能是个好主意（我们有新的限制等等）。

Answer 2

如果您想检查地图集合是否为空，您可以这样做：

if(mapVariable.isEmpty() || mapVariable == null){...}

或者按照第二个链接（API 链接）中所述写入

traversable shouldBe empty

或

javaMap should not be empty

。查看 this 或 this 了解更多信息。

编辑

尝试将 @Valid 添加到集合中。

这是来自 Hibernate Validator Reference 的示例。

public class Car { 
@NotNull 
@Valid 
private List<Person> passengers = new ArrayList<Person>(); 
}

这是标准 JSR-303 行为。请参阅规范第 3.1.3 节。

Answer 3

这是适用于 Scala 2.13 和 3.3 的 Jakarta Bean 验证 3.0 https://github.com/bitlap/validation-scala