JSF 2 h：复合组件中的消息找不到输入的 id

Question

我有以下工作代码：

<h:outputLabel value="Name:" for="nameField"/>
<h:panelGroup>
    <h:inputText id="nameField" value="${bean.name}" required="true" />
    <t:message for="nameField"
        detailFormat="!" tooltip="true" errorClass="errorMessage"
        infoClass="infoMessage" fatalClass="fatalMessage"
        warnClass="warningMessage"/>
</h:panelGroup>

现在我正在尝试将消息组件包装成一个复合组件，如下所示：

<composite:interface>
    <composite:attribute name="for" required="true"/>
</composite:interface>

<composite:implementation>
    <t:message for="#{cc.attrs.for}"
                detailFormat="!" tooltip="true"
                errorClass="errorMessage" infoClass="infoMessage"
                fatalClass="fatalMessage" warnClass="warningMessage"/>
</composite:implementation>

使用参考实现 (2.0.3) 我得到以下异常：

Jul 8, 2011 10:59:13 AM org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlMessageRendererBase renderMessage
SEVERE: Could not render Message. Unable to find component 'nameField' (calling findComponent on component 'simplePersonSearchForm:j_idt89:j_idt100'). If the provided id was correct, wrap the message and its component into an h:panelGroup or h:panelGrid.
java.lang.NullPointerException
    at com.sun.faces.facelets.tag.jsf.CompositeComponentTagHandler.createMetaRuleset(CompositeComponentTagHandler.java:247)
    at javax.faces.view.facelets.MetaTagHandler.setAttributes(MetaTagHandler.java:123)
    at javax.faces.view.facelets.DelegatingMetaTagHandler.setAttributes(DelegatingMetaTagHandler.java:96)
    at com.sun.faces.facelets.tag.jsf.CompositeComponentTagHandler.setAttributes(CompositeComponentTagHandler.java:225)
    at com.sun.faces.facelets.tag.jsf.CompositeComponentTagHandler.applyNextHandler(CompositeComponentTagHandler.java:178)
.....
.....

Answer 1

<h:message> 可以正常工作。我认为这是 Tomahawk 实现中的一个错误。

所以你有两个选择：

1. 将其替换为<h:message>。

2. 将问题报告给 Tomahawk 人员并等待他们解决。