JSR 303の実装でClassCastExceptionが返される

Question

JSR 303を使用してカスタム検証アノテーションを実装していますが、エラーが発生しています。 Cross field validation with Hibernate Validator (JSR 303)

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] 

私は誰か助けてくれますか？

Answer 1

カスタム検証アノテーションを作成した場合は、@ Constraint（validatedBy = FieldMatchValidator.class）に正しいバリデータークラスがあることを確認してください。 validatedByが異なるクラスを持つ場合、ClassCastExceptionを取得します。 How to solve cast issue java.lang.ClassCastException: $Proxy cannot be cast to NotEmpty wich is annotationで報告された同様の問題を参照してください

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