私の見解selectOneMenuでは、次のコードに示すように私は持っています：
<h:panelGroup id="mysrvicenodesblock" layout="block">
<table id="mysrvicenodestab" border="0" width="100%">
<tr>
<td align="center" class="underline">node Id</td>
<td align="center" class="underline">node Name</td>
<td align="center" class="underline">Go to node</td>
<td align="center" class="underline">Action</td>
</tr>
<c:forEach items="${jbpmAPIUtil.myServiceNodeToComplete}" var="msntoc">
<tr>
<td align="center">${msntoc.getId()}</td>
<td align="center">${msntoc.getName()}</td>
<td align="center">
<h:selectOneMenu value="#{jbpmAPIUtil.procNdNameSelectedValue}" id="procnodes">
<f:selectItem itemLabel="" itemValue="" />
<f:selectItems value="#{jbpmAPIUtil.procnodes}" var="pn" itemLabel="# {pn.getName()}" itemValue="#{pn.getId()}" />
<f:ajax event="change" listener="#{jbpmAPIUtil.OnONeMenuProcNdSelChgeHndler}" />
</h:selectOneMenu>
</td>
<td align="center">
<h:commandLink value="Complete !">
<f:ajax event="click" listener="#{jbpmAPIUtil.Completemsn}">
</f:ajax> <f:param value="${msntoc.getWorkitemid()}" name="msntocwiid"/>
</h:commandLink>
</td>
</tr>
</c:forEach>
</table>
</h:panelGroup>
このコンポーネントは<h:panelGroup layout="block">、primefacesで定期的に更新されるに含まれていp:pollます。
この要素の値をバインドするために使用されるBeanは、セッションスコープのBeanです（これが「バインド」とも呼ばれるかどうかはわかりませんが、このコンポーネントには「バインド」属性はありません）。
Beanとビューのスコープが異なるためにこの問題が発生することを多くの投稿で読みましたが、この問題が発生することなく何度もこのような状況にあったことを覚えています。
どのバインディングがこの問題を引き起こしたのかを正確に知りたいのですが、この問題の発生を回避する他の解決策はありますか。
これは、commandLinkボタンをクリックしたときに発生するこの問題の完全なスタックであり、foreachループの内容を含むテーブルが変更されます（1つの行が削除され、他の2つの行がリストに追加されます）
SEVERE: +id: j_id1
type: javax.faces.component.UIViewRoot@c0fee0
+id: javax_faces_location_HEAD
type: com.sun.faces.component.ComponentResourceContainer@5be0a8
+id: j_id2
type: javax.faces.component.UIOutput@1fa3bee
+id: j_id3
type: javax.faces.component.UIOutput@174b989
+id: j_id4
type: javax.faces.component.UIOutput@40f2f1
+id: j_idt2
type: <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html>
+id: j_idt3
type: <html xmlns="http://www.w3.org/1999/xhtml">
+id: j_idt4
type: javax.faces.component.UIOutput@dd874
+id: j_idt5
type:
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<link rel="stylesheet" type="text/css" href="CSS/general.css"/>
<script src="JS/jquery-1.8.3.js"/>
<script src="JS/jquery-ui-1.10.0.custom.js"/>
<script src="JS/jquerygen.js"/>
<script src="JS/general.js"/>
<title>Xtensus Workflow App </title>
+id: j_idt6
type:
<body>
+id: j_idt7
type: javax.faces.component.html.HtmlForm@fdc98d
+id: j_idt8
type:
<div id="ctrldiv">
Id du noeud actuel (le curseur jbpm) :
+id: niid
type: javax.faces.component.html.HtmlOutputText@1bb55d3
+id: j_idt9
type: <br/>
Nom du noeud actuel (le curseur jbpm) :
+id: cnn
type: javax.faces.component.html.HtmlOutputText@1ff95a9
+id: j_idt10
type: <br/>
+id: j_idt11
type: javax.faces.component.html.HtmlCommandLink@baa6f7
+id: j_idt12
type:
<br/>
<br/>
<H3>#Noeuds en cours d'execution : </H3>
<div>
+id: mysrvicenodesblock
type: javax.faces.component.html.HtmlPanelGroup@27d9e5
+id: j_idt13
type:
<table id="mysrvicenodestab" border="0" width="100%">
<tr>
<td align="center" class="underline">node Id</td>
<td align="center" class="underline">node Name</td>
<td align="center" class="underline">Go to node</td>
<td align="center" class="underline">Action</td>
</tr>
+id: j_idt18
type:
<tr>
<td align="center">${msntoc.getId()}</td>
<td align="center">${msntoc.getName()}</td>
<td align="center">
+id: procnodes
type: javax.faces.component.html.HtmlSelectOneMenu@527386
+id: j_idt19
type: javax.faces.component.UISelectItem@11e7e46
+id: j_idt20
type: javax.faces.component.UISelectItems@f45673
+id: j_idt21
type:
</td>
<td align="center">
+id: j_idt22
type: javax.faces.component.html.HtmlCommandLink@157be76
+id: j_idt23
type: javax.faces.component.UIParameter@1996e15
+id: j_idt24
type:
</td>
</tr>
+id: j_idt25
type:
<tr>
<td align="center">${msntoc.getId()}</td>
<td align="center">${msntoc.getName()}</td>
<td align="center">
+id: procnodes
type: javax.faces.component.html.HtmlSelectOneMenu@a5adc
+id: j_idt27
type: javax.faces.component.UISelectItem@1d34eac
+id: j_idt28
type: javax.faces.component.UISelectItems@1d20651
+id: j_idt29
type:
</td>
<td align="center">
+id: j_idt30
type: javax.faces.component.html.HtmlCommandLink@19cee52
+id: j_idt31
type: javax.faces.component.UIParameter@1e27046
+id: j_idt32
type:
</td>
</tr>
+id: j_idt33
type:
<tr>
<td align="center">${msntoc.getId()}</td>
<td align="center">${msntoc.getName()}</td>
<td align="center">
+id: procnodes
type: javax.faces.component.html.HtmlSelectOneMenu@1391a2c
+id: j_idt35
type: javax.faces.component.UISelectItem@1e54eb7
+id: j_idt36
type: javax.faces.component.UISelectItems@1930089
+id: j_idt37
type:
</td>
<td align="center">
+id: j_idt38
type: javax.faces.component.html.HtmlCommandLink@860ba
+id: j_idt39
type: javax.faces.component.UIParameter@664ca
+id: j_idt40
type:
</td>
</tr>
+id: j_idt14
type:
</table>
+id: j_idt15
type:
</div>
</div>
+id: j_idt16
type: org.primefaces.component.poll.Poll@1c334de
+id: j_idt17
type:
</body>
</html>
Mar 8, 2013 5:08:49 AM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
SEVERE: Error Rendering View[/index.xhtml]
java.lang.IllegalStateException: Component ID j_idt7:procnodes has already been found in the view.
at com.sun.faces.util.Util.checkIdUniqueness(Util.java:910)
at com.sun.faces.util.Util.checkIdUniqueness(Util.java:894)
at com.sun.faces.util.Util.checkIdUniqueness(Util.java:894)
at com.sun.faces.application.view.FaceletFullStateManagementStrategy.saveView(FaceletFullStateManagementStrategy.java:680)
at com.sun.faces.application.StateManagerImpl.saveView(StateManagerImpl.java:89)
at javax.faces.application.StateManager.getViewState(StateManager.java:553)
at com.sun.faces.context.PartialViewContextImpl.renderState(PartialViewContextImpl.java:416)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:300)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:183)
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:981)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:409)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125)
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 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
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:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
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:1001)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1770)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)