ValueBindingImpl.setValue error on binding for dataTable

Question

HI,
I am getting the following error when trying to do a datatable binding.
I am using WSAD 5.1.2 , JSF 1.0 .
In the jsp page:
<h:dataTable id="entitlementsId" value="#{header.entitlementsDummy}" binding="#{header.entitlementsLinksData}" var="entitlement"
                                    border="0" cellspacing="0" cellpadding="0" />In my managed bean code,I am trying to add a dynamic no of columns to the datatable:
public void setEntitlementsLinksData(HtmlDataTable table) {
          if (table == null) {
               table = new HtmlDataTable();
               table.setRendererType(null);
          //TODO: when to clear and when to add
          List tableComponents = table.getChildren();
          tableComponents.clear();
          entitlements = getEntitlements();//Arraylist with String returned
          String var = table.getVar();
          //TODO: check this ??
          table.setValue(entitlements);
          table.setRows(1);
          HtmlOutputText textComponent = null;
          HtmlOutputLink linkComponent = null;
          UIColumn col;
          UIOutput out;
          for (int j = 0; j < 1; j++) {
               String entitlement = (String) entitlements.get(j);
               linkComponent = new HtmlOutputLink();
               linkComponent.setId(var + "link" + j);
               linkComponent.setValue(entitlement);
               linkComponent.setStyleClass("navlink");
               /* create the text label */
               textComponent = new HtmlOutputText();
               textComponent.setId(var + "text" + j);
               textComponent.setValue(entitlement);
               /* add the label to the link component*/
               linkComponent.getChildren().add(textComponent);
               col = new UIColumn();
               col.setId(var + "col" + j);
               /*   add the link component to the column */
               col.getChildren().add(linkComponent);
               /*   add the column to the table */
               tableComponents.add(col);
     }Error :
javax.faces.el.EvaluationException: java.lang.UnsupportedOperationException
     at com.sun.faces.el.ValueBindingImpl.setValue(ValueBindingImpl.java:240)
     at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:491)
     at javax.faces.webapp.UIComponentTag.createComponent(UIComponentTag.java:1013)
     at javax.faces.webapp.UIComponentTag.createChild(UIComponentTag.java:1040)
     at javax.faces.webapp.UIComponentTag.findComponent(UIComponentTag.java:730)
     at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:423)
     at com.sun.faces.taglib.html_basic.DataTableTag.doStartTag(DataTableTag.java:467)
     at org.apache.jsp._EnterApplicationHeader._jspService(_EnterApplicationHeader.java:229)
     at com.ibm.ws.webcontainer.jsp.runtime.HttpJspBase.service(HttpJspBase.java:89)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
Caused by: java.lang.UnsupportedOperationException
     at java.util.AbstractMap.put(AbstractMap.java:235)
     at com.sun.faces.el.PropertyResolverImpl.setValue(PropertyResolverImpl.java:158)
     at com.ibm.faces.databind.SelectItemsPropResolver.setValue(SelectItemsPropResolver.java:63)
     at com.ibm.faces.application.SuperPropertyResolver.setValue(SuperPropertyResolver.java:101)
     at com.sun.faces.el.impl.ArraySuffix.setValue(ArraySuffix.java:192)
     at com.sun.faces.el.impl.ComplexValue.setValue(ComplexValue.java:171)
     at com.sun.faces.el.ValueBindingImpl.setValue(ValueBindingImpl.java:212)Thanks,
Vijay

Answer 1

A couple of things that might cause the PropertyResolver to break:
1. Does your 'header' bean and instanceof Map? If so, the PropertyResolver spec says if the bean is a map, take the property (entitlementsLinksData) and 'put' it into the Map for a set, the same thing goes for a 'get' with beans of type Map.
2. If that's not the case, you can try grabbing a recent snapshot of JSF-RI from https://javaserverfaces.dev.java.net/ which has a complete rewrite of expression handling that fixed a few bugs.