I'm having troubles with rich:tree. In every page where is a tree, whenever an ajax call is executed it crashes and I get an duplicate component id error:

11:02:30,770 SEVERE [javax.enterprise.resource.webcontainer.jsf.application] (http-/0.0.0.0:8080-4) JSF1007: Duplicate component ID bscRpPrmF:foldersTree:j_idt278 found in view.
11:02:30,773 SEVERE [javax.enterprise.resource.webcontainer.jsf.application] (http-/0.0.0.0:8080-4) +id: j_id1
type: javax.faces.component.UIViewRoot@41d6afee

I think there is a problem with rich:tree because is reloaded even when it shouldn't be. I've created a very simple example:

Tree backing bean:

@ManagedBean
@SessionScoped
public class TreeBackingBean implements Serializable {
    private SimpleTreeNode<TreeObject> tree;


    @PostConstruct
    private void initBean() {
        tree = new TreeDataProvider().getTree();
    }


    // tree getter/setter
    public SimpleTreeNode<TreeObject> getTree() {
        return tree;
    }


    public void setTree(SimpleTreeNode<TreeObject> tree) {
        this.tree = tree;
    }
}

Tree data provider:

public class TreeDataProvider {
    private SimpleTreeNode<TreeObject> root;


    public SimpleTreeNode<TreeObject> getTree() {
        if (root == null) {
            root = new SimpleTreeNode<TreeObject>(false, null, null);


            // node 1.1
            SimpleTreeNode<TreeObject> child = new SimpleTreeNode<TreeObject>(false, "Node 1.1", new TreeObject("Node", "1.1"));
            root.addChild(child.hashCode(), child);


            // node 1.1.1
            SimpleTreeNode<TreeObject> subChild = new SimpleTreeNode<TreeObject>(true, "Leaf 1.1.1", new TreeObject("Leaf", "1.1.1"));
            child.addChild(subChild.hashCode(), subChild);


            // node 1.1.2
            subChild =  new SimpleTreeNode<TreeObject>(true, "Leaf 1.1.2", new TreeObject("Leaf", "1.1.2"));
            child.addChild(subChild.hashCode(), subChild);


            // node 1.2
            child = new SimpleTreeNode<TreeObject>(true, "Leaf 1.2", new TreeObject("Leaf", "1.2"));
            root.addChild(child.hashCode(), child);


            // node 1.3
            child = new SimpleTreeNode<TreeObject>(false, "Node 1.3", new TreeObject("Node", "1.3"));
            root.addChild(child.hashCode(), child);


            // node 1.3.1
            subChild = new SimpleTreeNode<TreeObject>(true, "Leaf 1.3.1", new TreeObject("Leaf", "1.3.1"));
            child.addChild(subChild.hashCode(), subChild);
        }
        return root;
    }
}

xhtml:

<h:body>
    <h3>Rich Tree example</h3>
    <h:form>
        <rich:tree value="#{treeBackingBean.tree}" var="node" selectionType="client" toggleType="client" styleClass="tree">
            <rich:treeNode expanded="#{node.selected}">
                <h:outputText value="#{node.name}" />
            </rich:treeNode>
        </rich:tree>


        <br/>
        <h:outputText id="randomNumber" value="Random number: #{helloBean.randomNumber()}" />


        <br/>
        <a4j:commandLink value="Ajax" render="@this" execute="@this" limitRender="true" />
    </h:form>


    <br/>
    <a4j:log level="debug" />


</h:body>

So the problem is that every time commandLink is clicked, treeBackingBean.getTree() is executed. As far as I understand this is wrong. I put also an random number output just to double check if anything else is executed.

CommandLink's execute @this should define that only the command link itself should be processed and render @this defines that only command link is re rendered. So why getTree is executed? I think this is somehow connected with my duplicate id problem.