Can't get child node in tree selection listener

Question

I am making a fusion web application using JDeveloper 11G (11.1.1.2.0).
I have created two view objects linked together. Let's call them VoDepartments and VoEmployees, linked on DepartmentId.
I hava made a tree with a af:switcher
<af:switcher id="s1" facetName="#{node.hierType.structureDefName}">
<f:facet name="view.VoDepartments">
  <af:outputText value="#{node}" id="ot1"/>
</f:facet>
<f:facet name="view.VoEmployees">
  <af:outputText value="#{node}" id="ot2"/>
</f:facet>
</af:switcher>I made a selection listener based on a guide by Frank Nimphius
RichTree tree1 = (RichTree) selectionEvent.getSource();
RowKeySet rks2 = selectionEvent.getAddedSet();
Iterator rksIterator = rks2.iterator();
if (rksIterator.hasNext()){
  List key = (List)rksIterator.next();
  JUCtrlHierBinding treeBinding = null;
  treeBinding = (JUCtrlHierBinding) ((CollectionModel)tree1.getValue()).getWrappedData();
  JUCtrlHierNodeBinding nodeBinding = nodeBinding = treeBinding.findNodeByKeyPath(key);
  String nodeStuctureDefname = nodeBinding.getHierTypeBinding().getStructureDefName(); //Here is the nullpointerexception for employees
  String employees = "view.VoEmployees";
  String departments = "view.VoDepartments";
  if (nodeStuctureDefname.equalsIgnoreCase(departments)){
   String dept = (String) nodeBinding.getAttribute("Department_name");  
   System.out.println("Department = "+dept);
  else if (nodeStuctureDefname.equalsIgnoreCase(employees)){
   String emp = (String) nodeBinding.getAttribute("First_name");  
   System.out.println("Employee = "+emp);
  else{
   //what the heck did the user click on? Ask him ;-)
}Pagedef:
Executables:
<iterator Binds="VoDepartments2" RangeSize="25" DataControl="AppMainDataControl" id="VoDepartments2Iterator"/>
Bindings:
<tree IterBinding="VoDepartments2Iterator" id="VoDepartments2">
<nodeDefinition DefName="view.VoDepartments" Name="VoDepartments20">
  <AttrNames>
   <Item Value="DepartmentId"/>
  </AttrNames>
  <Accessors>
   <Item Value="VoEmployees"/>
  </Accessors>
</nodeDefinition>
<nodeDefinition DefName="view.VoEmployees2" Name="VoDepartments21">
  <AttrNames>
   <Item Value="First_name"/>
   <Item Value="Last_name"/>
  </AttrNames>
</nodeDefinition>
</tree>The tree works just fine and list all it should list. I can click the department and my selection listener print the departments name in the console.
I can expand a department and list all employees. The problems is when I click an employee, I get null pointer exception.
I have found out that the selectin listener can't find nodeBiding for employees. So nodeBinding.getHierTypeBinding().getStructureDefName(); throw NullpointerException.
Anyone have an idea of what's wrong? Please help.
-Thomas
Edited by: Thomas H on Mar 22, 2010 8:21 AM

Answer 1

Hi,
if you open the tree binding editor, it has an entry "Target Data Source" for each of the node levels that you can use and point to an iterator binding representing the node. Not sure if this solves the issue, but chaces are.
1. create an iterator for a child VO (using the not dependent child VO instance)
2. Edit Target Data Source for the binding to e.g. ${bindings.EmployeesView1Iterator}
Frank