hibernate - javax.validation.validationException : At least one custom message must be created

Question

根据用 hibernate JSR 303 编写的 checkCase 约束 validator chackCase contraintValidator

public boolean isValid(Group group, ConstraintValidatorContext constraintValidatorContext) {
    boolean isValid = false;
    ...

    if(!isValid) {
        constraintContext.disableDefaultConstraintViolation();
        constraintValidatorContext
            .buildConstraintViolationWithTemplate( "{my.custom.template}" )
            .addNode( "myProperty" ).addConstraintViolation();
    }
    return isValid;
}

使用 <f:validateBean> 在 JSF 中应用此 validator 将导致此异常:
javax.validation.validationException:如果默认错误消息被禁用，则至少必须创建一条自定义消息

使用此 validator

package com.mycompany;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class CheckCaseValidator implements ConstraintValidator<CheckCase, String> {

    private CaseMode caseMode;

    public void initialize(CheckCase constraintAnnotation) {
        this.caseMode = constraintAnnotation.value();
    }

    public boolean isValid(String object, ConstraintValidatorContext constraintContext) {

        if (object == null)
            return true;

        if (caseMode == CaseMode.UPPER)
            return object.equals(object.toUpperCase());
        else
            return object.equals(object.toLowerCase());
    }

}

没有 constraintValidatorContext 将在 <h:messages> 中给出消息

Answer 1

问题是， validator 中的 validate() 返回 false 但没有创建消息。你必须像这样添加一个:

if (some condition) {
    constraintContext.buildConstraintViolationWithTemplate("something is wrong")
            .addConstraintViolation();
    return false;
}
return true;