在支持 bean 中:
@Min(3)
Integer foo;
如果我有这样的形式:
<h:form>
<h:commandButton value="Submit" />
<h:inputText value="#{bean.foo}" />
</h:form>
这工作正常。但是,如果我做类似的事情
<cc:interface>
<cc:attribute name="text" />
<cc:editableValueHolder name="text" targets="field" />
<cc:interface>
<cc:implementation>
<h:inputText id="field" value="#{cc.attrs.text}" />
</cc:implementation>
并在表单内部调用它而不是直接调用h:inputText
as in:
<!-- <h:inputText value="#{bean.foo}" /> -->
<pref:fieldComponent text="#{bean.foo}" />
但后来我得到:
javax.validation.ValidationException: Unexpected exception during isValid call
at org.hibernate.validator.engine.ConstraintTree.validateSingleConstraint(ConstraintTree.java:144)
at org.hibernate.validator.engine.ConstraintTree.validateConstraints(ConstraintTree.java:118)
at org.hibernate.validator.metadata.MetaConstraint.validateConstraint(MetaConstraint.java:121)
at org.hibernate.validator.engine.ValidatorImpl.validateValueForGroup(ValidatorImpl.java:655)
...
而根本原因是:
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
at org.hibernate.validator.constraints.impl.MinValidatorForNumber.isValid(MinValidatorForNumber.java:32)
at org.hibernate.validator.engine.ConstraintTree.validateSingleConstraint(ConstraintTree.java:141)
... 69 more
如果我删除验证,它就会起作用。另外,如果foo
属于类型String
,它也适用于验证。
我尝试玩cc:editableValueHolder
,定义不同的类型(也省略它)和一些其他技巧,但我有点不确定如何实际实现它。或者这是一个错误?似乎忘记使用转换器?我是否误解了什么?