FacesContext首次释放其上下文值

我有一个Facelets页面，其中一个为h:commandLink。FacesContext首次释放其上下文值

<h:commandLink value="#{View} &#187;" 
    onclick="return myJavaScript('#{myBean.param1}');"> 
</h:commandLink> 

function myJavaScript(paramReceived) 
{ 
    var relPath = "/myWarName/Pages/myReceiptPage.jsf?" 
        + myActionValue; 
    billWindow = window.open(relPath, '', 'width=' + width + ',height=' 
        + height + ',top=' + top + ',left=' + left 
        + ',scrollbars=1,resizable=1'); 
    billWindow.focus(); 
}

下面是我myReceiptPage.xhtml页面代码，

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<div xmlns="http://www.w3.org/1999/xhtml" 
    xmlns:h="http://java.sun.com/jsf/html" 
    xmlns:ui="http://java.sun.com/jsf/facelets" 
    xmlns:f="http://java.sun.com/jsf/core"> 
    <head> 
    </head> 
     <f:view> 
      <body> 
      <h:form> 
       <ui:insert> 
          <ui:include src="/someOtherPage.xhtml" /> 
       </ui:insert> 

       <h:outputText value="#{facesContext.externalContext.requestParameterMap.UserID}" /> 

          </h:form> 
        <body> 
      </f:view> 
     <div>

当我点击h:commandLink，Java脚本被调用并打开一个窗口，但低于异常仅首次。从第二次开始，当我再次点击h:commandLink时，窗口打开，没有异常，数据正确填充。

当我点击h:commandLink PhaseListener正在调用，这是调用一个方法。下面是代码，

public void getUserId() 
    { 
     try 
     { 
      FacesContext context = FacesContext.getCurrentInstance(); 
      ExternalContext externalContext = context.getExternalContext(); 
        //Code continues 
     } 
      Catch(Exception E) 
      { 
       //Am getting to know the exception here 
      } 
     }

下面是个例外（其显示在窗口），

javax.faces.FacesException: javax.el.ELException: /view.xhtml @192,150 userID="#{myBean.userID}": Error reading 'userID' on type com.myBean 
     at javax.faces.component.UIOutput.getValue(UIOutput.java:187) 
     at org.richfaces.component.UITabPanel.getValue(UITabPanel.java:103) 
     at org.richfaces.renderkit.TabPanelRendererBase.encodeTabs(TabPanelRendererBase.java:309) 
     at org.richfaces.renderkit.html.TabPanelRenderer.doEncodeBegin(TabPanelRenderer.java:228) 
     at org.richfaces.renderkit.html.TabPanelRenderer.doEncodeBegin(TabPanelRenderer.java:180) 
     at org.ajax4jsf.renderkit.RendererBase.encodeBegin(RendererBase.java:100) 
     at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813) 
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:928) 
     at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) 
     at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837) 
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930) 
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933) 
     at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592) 
     at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:189) 
     at org.jboss.portletbridge.application.PortletViewHandler.renderView(PortletViewHandler.java:247) 
     at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)

还有什么可能的原因呢？

编辑：view.xhtml的内容被粘贴在下面。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" 
    xmlns:h="http://java.sun.com/jsf/html" 
    xmlns:ui="http://java.sun.com/jsf/facelets" 
    xmlns:f="http://java.sun.com/jsf/core" 
    xmlns:a4j="http://richfaces.org/a4j" 
    xmlns:rich="http://richfaces.org/rich" 
    xmlns:t="http://myfaces.apache.org/tomahawk"> 
<head> 
</head> 
<h:form id="myFormId"> 
<ui:insert> 
    <ui:include src="/myWarName/Pages/someOtherPage.xhtml" /> //Guess, problem is with this include. 
//This include is also there in myReceiptPage.xhtml page. 
</ui:insert> 

<rich:tabPanel selectedTab="#{myBean.getSelectedTab}"> 
    <rich:tab name="Tab Name"> 
     <h:panelGroup> 
      <ui:insert> 
       <ui:include src="somePage1.xhtml" /> 
      </ui:insert> 
     </h:panelGroup> 
     <h:panelGroup> 
      <ui:insert> 
       <ui:include src="somePage2.xhtml" /> 
      </ui:insert> 
     </h:panelGroup> 
</rich:tab> 
</h:form 
</html>

要添加到例外列表：以上<rich:tabPanel selectedTab="#{someBean.getSelectedTab}">

getSelectedTab方法是这样的，

public class myBean implements Serializable{ 
public String getSelectedSubTab() 
{ 
    FacesContext con=FacesContext.getCurrentInstance(); 
    ExternalContext externalContext = con.getExternalContext(); 
    String remoteUserId = externalContext.getRemoteUser(); 
    User user = UserServiceUtil.getUserById(Long.parseLong(remoteUserId)); 
    this.userID = user.getScreenName();   
} 
}

来源

2013-02-15 Vikas V

这是整个堆栈跟踪？看起来有一个潜在的原因是制造EL扼流圈。 – kolossus 2013-02-15 15:20:52

那么我们在这里没有看到'view.xhtml'，并且在这里放置有问题的EL。 – partlov 2013-02-15 20:16:48

@kolossus除了这个例外，我也得到了NullPointerException。这已经在我的问题中更新了。 – 2013-02-18 04:35:44

我必须说，我还没有看到任何XHTML文件表达#{myBean.userID} ，但问题可能是因为你的getter方法getUserId()被宣布为void，所以在此考虑属性userId不可读。你必须从getter返回属性。

来源

2013-02-18 07:57:35 partlov

FacesContext首次释放其上下文值

回答

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