In my opinion, I have selectOneMenu , as shown in the following code:
<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>
This component is contained in <h:panelGroup layout="block"> , which is periodically updated using simple p:poll .
The bean used to bind these element values is the session reach of the bean (I don’t know if this is also called “binding”, there is no “binding” attribute on this component).
I read in many posts that this problem occurs because the bean and view have different scopes, but I remember that I was in this situation many times when this problem did not occur.
I want to know exactly which binding caused this problem, and is there another solution to avoid this problem.
this is the full stack for this problem that occurs when I press the commandLink button so that the table with the contents of the foreach loop changes (one row will be deleted and 2 more will be added to the list)
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)
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