JSR 303实现提供了ClassCastException

Question

我正在使用JSR 303实现自定义验证批注，但出现错误。我正在关注使用Hibernate Validator（JSR 303）进行跨字段验证时提供的详细信息

java.lang.ClassCastException: com.sun.proxy.$Proxy95 cannot be cast to com.my.validator.FieldMatch
at com.my.validator.FieldMatchValidator.initialize(FieldMatchValidator.java:14) ~[classes/:na]
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.initializeConstraint(ConstraintValidatorManager.java:261) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.createAndInitializeValidator(ConstraintValidatorManager.java:183) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:122) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:303) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]
at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:617) ~[hibernate-validator-5.2.4.Final.jar:5.2.4.Final]

有人可以帮帮我吗？

Answer 1

如果您编写了自定义验证注释，请确保@Constraint（validatedBy = FieldMatchValidator.class）具有正确的验证器类。如果validatedBy具有不同的类，则您将获得ClassCastException。请参考在如何解决强制转换问题java.lang.ClassCastException中报告的类似问题：$ Proxy不能强制转换为NotEmpty，而注释是

@Target({TYPE, ANNOTATION_TYPE})
@Retention(RUNTIME)
@Constraint(validatedBy = FieldMatchValidator.class)
@Documented
public @interface FieldMatch
{
}