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当嵌套在ui:repeat中时，带有自定义支持组件的复合组件会奇怪地折断

本文介绍了当嵌套在ui:repeat中时，带有自定义支持组件的复合组件会奇怪地折断的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

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，它可以正常工作.当我将其嵌套在另一个复合组件中(也包含在ui:repeat中)时，出现异常，试图在UINamingContainer内的componentType类中查找我定义的属性-这是错误的类.我发现我可以通过将cc.whatever替换为component.parent.parent.parent.whatever来解决该问题，但是我发现这有点粗暴.我以为我在做一些愚蠢的事情，使JSF感到困惑，但是我不确定它是什么，或者我应该做些什么.

My problem in brief is that I have a composite component with a componentType specified. When I use the composite component alone on a page, it works fine. When I nest it inside another composite component (also inside a ui:repeat), I get an exception trying to find the properties I've defined on componentType class inside a UINamingContainer--which is the wrong class. I have found I can solve that problem by replacing cc.whatever with component.parent.parent.parent.whatever but I find that a bit of a gross hack. I assume I'm doing something stupid that's confusing JSF, but I'm not sure what it is or what I should do differently.

现在，要详细说明一下，我具有以下复合组件:

Now, in excruciating detail, I have the following composite component:

<?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此组件时，一切都很好:

When I use this component alone on a page, everything is fine:

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

当我将其嵌套在另一个这样的复合组件中时:

When I nest it inside another composite component like this:

<?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>

我收到此异常:

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)

我可以做的替代工作是这样的:

The replacement I can do that enables it to work is this:

<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>

从历史上讲，每当几个月后我试图通过这样的黑客使JSF工作时，这确实是错误的，这毁了我的生活.我将不胜感激任何帮助！我喜欢JSF，我真的很喜欢使用复合组件来构造事物，但是我确实需要能够嵌套复合组件.

That feels really wrong and historically whenever I try to make JSF work through a hack like this a few months later it ruins my life. I would greatly appreciate any help! I love JSF and I'm really enjoying using composite components to structure things, but I really need to be able to nest composite components.

编辑:我发现在Glassfish中，该组件根本无法独立呈现.嵌套在另一个组件中会产生相同的错误(UINamingContainer不具有LinearVelocityUIComponent的此属性).

Edit: I've discovered that in Glassfish, the component doesn't render at all in isolation. It produces the same error (UINamingContainer doesn't have this property LinearVelocityUIComponent has) nested in the other component.

推荐答案

我能够在Tomcat 7.0.30上重现Mojarra 2.1.14的问题(并使用那些ICEfaces组件的标准JSF <h:xxx>等效项).这归咎于Mojarra中嵌套<ui:repeat>的损坏状态保存机制.老实说，我不确定在"嵌套ui:repeat"涵盖了您的特定问题，报告过多，而您的特定报告对我来说却是新的.

I was able to reproduce your problem with Mojarra 2.1.14 on Tomcat 7.0.30 (and using standard JSF <h:xxx> equivalents of those ICEfaces components). This is blamed to broken state saving mechanism of nested <ui:repeat> in Mojarra. I'm honestly not sure which one of the Mojarra bug reports on "nested ui:repeat" covers your particular problem, there are too many reports and your particular one is new to me.

在MyFaces 2.1.9中，完全相同的代码对我来说很好用.当我至少用<h:dataTable>或<p:dataList>替换外部的<ui:repeat>时，它也可以正常工作.

Exactly the same code works fine for me in MyFaces 2.1.9. It also works fine when I replace at least the outer <ui:repeat> by <h:dataTable> or <p:dataList>.

因此，您有2个选项可以解决此问题:

So you have 2 options to solve this problem:

  1. 通过完全有价值的UIData实现替换(至少是外部的)<ui:repeat>，例如<h:dataTable>或<p:dataList>或我从头顶上看不到的任何ICEfaces等效项.这可能不会生成您想要的HTML，但是它可以工作，并且使用CSS可以做很多事情.

  1. Replace (at least the outer) <ui:repeat> by a fullworthy UIData implementation, such as <h:dataTable> or <p:dataList> or any ICEfaces equivalent which I can't tell from top of head. This might not generate the HTML you want, but it works and with CSS you can do a lot.

通过MyFaces替换Mojarra.不要忘记对整个Web应用程序进行彻底(单元)测试. MyFaces也有自己的一套怪癖和错误.

Replace Mojarra by MyFaces. Don't forget to thoroughly (unit)test your entire webapp. MyFaces has its own set of quirks and bugs as well.

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08-31 00:52
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