"Null child not allowed" on the TreeTable

[Nikita Shah]

 Hello Sebastein,

Did you have a workaround for the problem you were facing of null child..?
I am also using the MyFaces treeTable component. I have a list of tasks and their subtasks. I want to display task as the root node and sub-tasks as its children.

Following is my jsp page -

<t:dataTable id="taskTable" styleClass="taskTable"
    rowClasses="taskTable_Row1,taskTable_Row2" var="task"  columnClasses="task_nodeColumn,task_groupColumn,task_weightColumn"
    value="#{projectLeaf.tasks}">

<t:column>
    <t:tree id="tree" value="#{task.subTaskTree}"
                        var="treeItem" expandRoot="true">         
      <t:treeColumn>
           <f:facet name="header">
                <h:outputText value="Header 2" />
           </f:facet>
           <h:outputText value="#{treeItem.name}" />
       </t:treeColumn>
          
    </t:tree>
</t:column>
<t:column>
        <f:verbatim><b>Participants</b><br></f:verbatim>
</t:column>
</t:dataTable>

The bean method is as below -

public DefaultTreeModel getSubTaskTree()
    {       
        DefaultMutableTreeNode root = new DefaultMutableTreeNode(new Task(1,"root"));
        DefaultMutableTreeNode a = new DefaultMutableTreeNode(new Task(2, "A")); 
        root.insert(a); 
        DefaultMutableTreeNode b = new DefaultMutableTreeNode(new Task(3, "B")); 
        root.insert(b); 
        DefaultMutableTreeNode c = new DefaultMutableTreeNode(new Task(4, "C")); 
        root.insert(c);
DefaultTreeModel treeModel = new DefaultTreeModel(root);
        return treeModel;
    }

I get the following error
Base is null: task
Wud appreciate your help if you have come across such error or have any idea.

TIA
Nikita

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