logo标签列表

自定义后备组件的复合组件在ui:repeat中嵌套时出现异常问题。

jsf-2composite-component
3
我的问题简而言之是，我有一个指定了componentType的组合组件。当我在页面上单独使用组合组件时，它能正常工作。但当我将其嵌套在另一个组合组件中（也在ui:repeat中），我会得到一个异常，试图在UINamingContainer内查找我在componentType类中定义的属性，这是错误的类。我发现可以通过将cc.whatever替换为component.parent.parent.parent.whatever来解决这个问题，但我觉得这有点粗暴。我想我可能做了一些愚蠢的事情，让JSF感到困惑，但我不确定是什么或者我应该怎么做才能改变。

现在，详细说明如下：

<?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>

支持组件就是这个：
@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组合组件中时，就像这样：
<?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>

我收到了这个异常：
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)

我可以进行的替换使其正常工作是这样的：
<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>

这感觉非常不对劲，历史上每当我试图通过这样的方式让JSF工作时，几个月后它就会毁掉我的生活。我非常感谢任何帮助！我喜欢JSF，并且很享受使用组合组件来构建结构，但是我真的需要能够嵌套组合组件。
编辑：我发现在Glassfish中，该组件在隔离状态下根本不渲染。它在其他组件中嵌套时产生了同样的错误（UINamingContainer没有LinearVelocityUIComponent的属性）。
2个回答
2

我能够在Tomcat 7.0.30上使用Mojarra 2.1.14（并使用标准JSF <h:xxx> 等价的ICEfaces组件）重现您的问题。这是由于Mojarra中嵌套的<ui:repeat>的状态保存机制出现了问题。老实说，我不确定"nested ui:repeat"上的哪一个Mojarra错误报告涵盖了您的特定问题，因为有太多的报告，而您的问题是新问题。

在MyFaces 2.1.9中，完全相同的代码可以正常工作。当我将至少外部的替换为或时，它也可以正常工作。
所以你有两个选项来解决这个问题：
1. 将（至少外部的）替换为一个完整的UIData实现，例如或或任何ICEfaces等效实现，我无法从头脑中告诉您。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. 将Mojarra替换为MyFaces。不要忘记彻底（单元）测试您的整个Web应用程序。MyFaces也有自己的怪癖和错误。
非常感谢！你可能可以推断出，我的问题在于底层数据模型不像JavaBean那样，所以我用这个UIComponent来模拟它。你认为这种方法总体上是合理的，除了ui:repeat的怪癖？ - Daniel Lyons
1
如果有人需要帮助，我解决了一个类似的问题，其中我在另一个组合组件中嵌套了一个组合组件（cc）。一个实例没问题，在页面上使用两个实例会出现问题，尝试查找属于嵌套cc的类字段，但是却在主机cc中寻找它们。问题在于我为两个cc都使用了相同的名称变量。因此，“cc.attrs.bean”表达式对JSF来说很难处理......我通过在CC之间保持不同的参数名称来解决它。花了我一段时间才发现这一点。
网页内容由stack overflow 提供, 点击上面的
可以查看英文原文，
原文链接