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简而言之，我的问题是我有一个指定了 componentType 的复合组件。当我在页面上单独使用复合组件时，它工作正常。当我将它嵌套在另一个复合组件中时（也在 ui:repeat 中），我得到一个异常，试图找到我在 UINamingContainer 内的 componentType 类上定义的属性——这是错误的类。我发现我可以通过替换来解决这个问题cc.whatever，component.parent.parent.parent.whatever但我发现这有点严重。我假设我正在做一些让 JSF 感到困惑的愚蠢事情，但我不确定它是什么或者我应该做些什么不同的事情。

现在，在令人难以忍受的细节中，我有以下复合组件：

<?xml version='1.0' encoding='UTF-8' ?>
<ui:component xmlns:ui="http://java.sun.com/jsf/facelets"
              xmlns:cc="http://java.sun.com/jsf/composite"
              xmlns:ice="http://www.icesoft.com/icefaces/component"
              xmlns:f="http://java.sun.com/jsf/core">
  <cc:interface componentType="edu.nrao.sss.tools.resrccat.ui.support.LinearVelocityUIComponent">
    <cc:attribute name             = "value"
                  class            = "edu.nrao.sss.measure.LinearVelocity"
                  required         = "true"
                  shortDescription = "The LinearVelocity value to show or edit."/>

    <cc:attribute name             = "separate-units"
                  type             = "boolean"
                  default          = "true"
                  shortDescription = "If true, provide a drop-box to edit the units separately from the value."/>
  </cc:interface>
  <cc:implementation>
    <ice:inputText id="velocity" value="#{cc.attrs.value}" rendered="#{not cc.attrs['separate-units']}"/>

    <ui:fragment rendered="#{cc.attrs['separate-units']}">
      <ice:inputText id="velocityDecimal" value="#{cc.velocityDecimal}"/>
      <ice:selectOneMenu id="velocityUnits" value="#{cc.velocityUnits}">
        <f:selectItems value="#{siFactory.linearVelocityUnits}"/>
      </ice:selectOneMenu>
    </ui:fragment>
  </cc:implementation>
</ui:component>

支持组件是这样的：

@FacesComponent("edu.nrao.sss.tools.resrccat.ui.support.LinearVelocityUIComponent")
public class LinearVelocityUIComponent extends UIInput implements NamingContainer {

  @Override public String getFamily() {
    return UINamingContainer.COMPONENT_FAMILY;
  }

  public LinearVelocity getVelocity() {
    return (LinearVelocity) getValueExpression("value").getValue(FacesContext.getCurrentInstance().getELContext());
  }

  public void setVelocity(LinearVelocity newVelocity) {
    getValueExpression("value").setValue(FacesContext.getCurrentInstance().getELContext(), newVelocity);
  }

  public BigDecimal getVelocityDecimal() {
    return getVelocity().getValue();
  }

  public LinearVelocityUnits getVelocityUnits() {
    return getVelocity().getUnits();
  }

  public void setVelocityDecimal(BigDecimal newVelocity) {
    setVelocity(new LinearVelocity(newVelocity, getVelocityUnits()));
  }

  public void setVelocityUnits(LinearVelocityUnits units) {
    setVelocity(new LinearVelocity(getVelocityDecimal(), units));
  }
}

当我在页面上单独使用这个组件时，一切都很好：

<p>Your linear velocity is <rct:linear-velocity value="#{test.velocity}"/></p>

当我将它嵌套在另一个像这样的复合组件中时：

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:component xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ice="http://www.icesoft.com/icefaces/component"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:cc="http://java.sun.com/jsf/composite"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:rct="http://java.sun.com/jsf/composite/components/rct">
  <cc:interface>
    <cc:attribute name="specs"        required="true"/>
    <cc:attribute name="type"         default="line"/>
  </cc:interface>
  <cc:implementation>
    <table class="iceDatTbl">
      <thead>
        <tr>
          ...
          <th class="iceDatTblColHdr2">Minimum<br/>Span</th> 
          ...
        </tr>
      </thead>
      <tbody>
        <ui:repeat var="spec" value="#{cc.attrs.specs}" varStatus="stat">
          <tr class="#{stat.even ? 'iceDatTblRow1' : 'iceDatTblRow2'}">
            ...
            <td class="iceDatTblCol2">
              Req: <rct:linear-velocity value="#{spec.minimumSpan}"/><br/>
              Sug: #{spec.suggestedMinimumSpan}
            </td>
            ...
          </tr>
        </ui:repeat>
      </tbody>
    </table>
  </cc:implementation>
</ui:component>

我得到这个例外：

Nov 19, 2012 4:10:37 PM org.icefaces.impl.application.ExtendedExceptionHandler handle
WARNING: queued exception
javax.el.PropertyNotFoundException: /resources/components/rct/linear-velocity.xhtml @20,113 value="#{cc.velocityDecimal}": Property 'velocityDecimal' not found on type javax.faces.component.UINamingContainer
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:111)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
    at javax.faces.component.UIOutput.getValue(UIOutput.java:169)
    at com.sun.faces.facelets.component.UIRepeat$SavedState.populate(UIRepeat.java:823)
    at com.sun.faces.facelets.component.UIRepeat.saveChildState(UIRepeat.java:369)
    at com.sun.faces.facelets.component.UIRepeat.saveChildState(UIRepeat.java:375)
    at com.sun.faces.facelets.component.UIRepeat.saveChildState(UIRepeat.java:375)
    at com.sun.faces.facelets.component.UIRepeat.saveChildState(UIRepeat.java:355)
    at com.sun.faces.facelets.component.UIRepeat.setIndex(UIRepeat.java:440)
    at com.sun.faces.facelets.component.UIRepeat.visitTree(UIRepeat.java:613)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
    at javax.faces.component.UINamingContainer.visitTree(UINamingContainer.java:163)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
    at org.icefaces.impl.component.UISeriesBase.visitRows(UISeriesBase.java:1174)
    at org.icefaces.impl.component.UISeriesBase.visitTree(UISeriesBase.java:1065)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
    at javax.faces.component.UIForm.visitTree(UIForm.java:344)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
    at org.icefaces.impl.event.RestoreResourceDependencies.processEvent(RestoreResourceDependencies.java:24)
    at javax.faces.event.SystemEvent.processListener(SystemEvent.java:106)
    at com.sun.faces.application.ApplicationImpl.processListeners(ApplicationImpl.java:2168)
    at com.sun.faces.application.ApplicationImpl.invokeListenersFor(ApplicationImpl.java:2144)
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:302)
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:246)
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:812)
    at javax.faces.component.UIViewRoot.encodeBegin(UIViewRoot.java:962)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1755)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at com.ocpsoft.pretty.faces.application.PrettyViewHandler.renderView(PrettyViewHandler.java:163)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:145)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:137)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at edu.nrao.sss.webapp.LookupUserFilter.doFilter(LookupUserFilter.java:57)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.jasig.cas.client.util.HttpServletRequestWrapperFilter.doFilter(HttpServletRequestWrapperFilter.java:50)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:167)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:111)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)

我可以做的使它能够工作的替换是这样的：

<ui:fragment rendered="#{cc.attrs['separate-units']}">
  <ice:inputText id="velocityDecimal" value="#{component.parent.parent.parent.velocityDecimal}"/>
  <ice:selectOneMenu id="velocityUnits" value="#{component.parent.parent.parent.velocityUnits}">
    <f:selectItems value="#{siFactory.linearVelocityUnits}"/>
  </ice:selectOneMenu>
</ui:fragment>

几个月后，每当我试图通过这样的 hack 让 JSF 工作时，这感觉真的是错误的，而且从历史上看，它毁了我的生活。我将不胜感激任何帮助！我喜欢 JSF，而且我非常喜欢使用复合组件来构建事物，但我确实需要能够嵌套复合组件。

编辑：我发现在 Glassfish 中，组件根本不会单独渲染。它会产生相同的错误（UINamingContainer 没有此属性 LinearVelocityUIComponent 有）嵌套在另一个组件中。

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2 回答 2

2

我能够在 Tomcat 7.0.30 上使用 Mojarra 2.1.14 重现您的问题（并使用<h:xxx>这些 ICEfaces 组件的标准 JSF 等效项）。这归咎于嵌套<ui:repeat>在 Mojarra 中的破坏状态保存机制。老实说，我不确定 Mojarra 关于“嵌套 ui:repeat”的错误报告中的哪一个涵盖了您的特定问题，报告太多，而您的特定报告对我来说是新的。

在 MyFaces 2.1.9 中，完全相同的代码对我来说很好用。当我至少将外部替换为 or 时，它也可以<ui:repeat>正常<h:dataTable>工作<p:dataList>。

因此，您有 2 个选项来解决此问题：

  1. <ui:repeat>用一个完全有价值的实现替换（至少是外部的）UIData，例如<h:dataTable>or<p:dataList>或任何我无法从头顶分辨出来的 ICEfaces 等效项。这可能不会生成您想要的 HTML，但它可以工作并且使用 CSS 您可以做很多事情。

  2. 用 MyFaces 替换 Mojarra。不要忘记彻底（单元）测试您的整个 web 应用程序。MyFaces 也有自己的一套怪癖和错误。

于 2012-11-20T02:47:57.237 回答
1

如果它对任何人有帮助，我解决了一个类似的问题，我将一个复合组件 (cc) 嵌套在另一个复合组件中。一个实例没问题，一个页面中的两个实例有问题，试图找到属于嵌套 cc 但在主机 cc 中寻找它们的类字段。问题是我为两个 ccs 使用了相同的名称变量。所以，EL 表达式“cc.attrs.bean”让 JSF 难以处理......我通过在 CC 之间保留不同的参数名称来解决它。我花了一段时间才发现这一点。

于 2019-05-16T14:04:57.900 回答