javax.validation.constraints.NotBlank 用法

javax.validation.UnexpectedTypeException:

HV000030:

No validator could be found for constraint 'javax.validation.constraints.NotBlank' validating type 'java.lang.Integer'. Check configuration for 'finalNum'
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getExceptionForNullValidator(ConstraintTree.java:108)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:140)
    at org.hibernate.validator.internal.engine.constraintvalidation.SimpleConstraintTree.validateConstraints(SimpleConstraintTree.java:55)  

 

解答 1：@NotBlank  只能作用在String上，不能为null，而且调用trim()后，长度必须大于0，   故用在integer上报错，data上报错。