版本不匹配引发的坑：javax.validation.UnexpectedTypeException_ HV000030_ No validator could be found for constraint

本文由简悦 SimpRead 转码，原文地址 www.cnblogs.com

发现一个 API 报了错：

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javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.NotEmpty' validating type 'java.lang.String'. Check configuration for 'cancelReason'
    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.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:103) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.boot.autoconfigure.web.WebMvcValidator.validate(WebMvcValidator.java:64) ~[spring-boot-autoconfigure-1.5.13.RELEASE.jar:1.5.13.RELEASE]
    at org.springframework.validation.DataBinder.validate(DataBinder.java:895) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.validateIfApplicable(AbstractMessageConverterMethodArgumentResolver.java:270) ~[spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:133) ~[spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121) ~[spring-web-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:158) ~[spring-web-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128) ~[spring-web-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) ~[spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ~[spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPut(FrameworkServlet.java:883) [spring-webmvc-4.3.17.RELEASE.jar:4.3.17.RELEASE]

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一、Spring MVC 的参数校验 Spring 的参数校验会用到两个库：validation-api，hibernate-validator validation-api 是一套标准，hibernate-validator 实现了此标准。 JSR-303 是 Java EE 6 中的一项子规范，叫做 BeanValidation，官方参考实现是 hibernate-validator。

二、HV000030: No validator 报这个错，一般有两种情况：（1）约束与对象属性不匹配，譬如在 String 上使用 javax.validation.constraints.Future 就会报这个错（2）真的是没有相关的 Validator

一下子觉得很奇怪，难道 javax.validation.constraints.NotEmpty 不能用在 java.lang.String??

这有什么错呢!! 真的是没有 Validator?

如果有，会是这样的，以 javax.validation.constraints.Future 为例：

还真没有！！但是 @NotEmpty 是有两个的看了下线上在跑的的 API，发现使用的是 org.hibernate.validator.constraints.NotEmpty。刚才也看到了，也是没有对应 Validator 但是有一些与 javax.validation.constraints.NotEmpty 不一样的地方：使用了两个元约束 @NotNull 和 @Size(min=1)

也就是一个校验不需要一个专门的 Validator 也是可以的？

三、ComposingConstraints【组合约束】

打断点看了下, hibernate-validator 在处理约束时，使用组合约束的概念【可扩展性好强】。具体工作流程如下：（1）先递归校验组合约束。譬如 org.hibernate.validator.constraints.NotEmpty 中的 @NotNull 和 @Size(min=1) （2）校验主约束，如果有则校验；否则，跳过。譬如 org.hibernate.validator.constraints.NotEmpty （3）处理组合约束的校验结果。有三种策略：OR,AND,ALL_FALSE org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree#validateConstraints(org.hibernate.validator.internal.engine.ValidationContext, org.hibernate.validator.internal.engine.ValueContext<?,V>, java.util.Set<javax.validation.ConstraintViolation>)