ui:repeat 中条件渲染子类的 PropertyNotFoundException

问题描述

我有一个超类Person:

public class Person {
    public abstract Type getType();
}

我有它的 2 个子类:

I have 2 subclasses of it:

public class JuridicalPerson extends Person {
    public Type getType() {
        return Type.JP;
    }
    public List<JuridicalBelong> getJuridicalBelongs() {
        return juridicalBelongs;
    }
}

public class NaturalPerson extends Person {
    public Type getType() {
        return Type.NP;
    }
    public List<NaturalBelong> getNaturalBelongs() {
        return naturalBelongs;
    }
}

JuridicalBelong 和 NaturalBelong 属性不同，不能子类化.

JuridicalBelong and NaturalBelong have different properties and can't be subclassed.

我将它们放在 List<Person> 中，我想在 JSF/Facelets 中显示如下:

I have them in a List<Person> which I'd like to present in JSF/Facelets as follows:

<ui:repeat value="#{bean.persons}" var="person">
    <h:panelGroup rendered="#{person.type eq 'JP'}">
        <ui:repeat value="#{person.juridicalBelongs}" var="juridicalBelong">
            ...
        </ui:repeat>
    </h:panelGroup>
    <h:panelGroup rendered="#{person.type eq 'NP'}">
        <ui:repeat value="#{person.naturalBelongs}" var="naturalBelong">
            ...
        </ui:repeat>
    </h:panelGroup>
</ui:repeat>

但是，这会导致以下异常:

However, this causes the following exception:

javax.el.PropertyNotFoundException:com.example.NaturalPerson"类没有juridicalBelongs"属性.

这怎么可能?根据我的 rendered 条件

How is this possible? As per my rendered condition

<h:panelGroup rendered="#{person.type eq 'JP'}">

它应该忽略NaturalPerson，对吧?

推荐答案

这是由 Mojarra 的 <ui:repeat> 状态管理中的错误引起的，当您使用 <ui:repeat> 内的 EditableValueHolder 组件(输入字段)也是如此.这是根据 issue 3219 修复的.Mojarra 2.2.7 并且对于向后移植到 Mojarra 的 JSF 2.0/2.12.1.29 根据 issue 3224.所以至少升级到那个版本(或者只是根据 Mojarra 主页提供的最新版本)应该这样做.

This is caused by a bug in state management of Mojarra's <ui:repeat> which will expose when you use EditableValueHolder components (input fields) inside the <ui:repeat> as well. This is fixed as per issue 3219. The fix is available in Mojarra 2.2.7 and for JSF 2.0/2.1 backported to Mojarra 2.1.29 as per issue 3224. So upgrading to at least that version (or just the latest available as per Mojarra homepage) should do it.

否则，最好的办法是将 <ui:repeat> 替换为 <c:forEach>.

Otherwise, your best bet is to replace <ui:repeat> by <c:forEach>.

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