Rich:tree remove a node

[keyga]

Hi everyone,

I have a rich:tree which works with a recursiveTreeNodesAdaptor, and my question is how can I remove a selected node?

My recursive bean:

public class Organisation implements Serializable {
    private static final long serialVersionUID = 1L;
    
    private List<Organisation> children;

    private String type;
    private Item item;

    private Organisation parent;

    ...

    public void removeChild() {
        Organisation item = DynamicTree.getChildSelected(); // get the selected node as an Organisation
        if (item != null){
            if(item.getParent() != null){ // if it's not the root node
                
                Organisation parent = item.parent;

                List<Organisation> list_children = parent.getChildren();                
                
                int i = 0;
                for(Organisation o : list_children){
                    if(organisationAreEquals(o, item)){ // if we found the child to delete
                        break;
                    }
                    i++;
                }
                
                list_children.remove(i);
    }
}

But apparently we can't use "remove", I don't know why, I get this error:

Caused by: java.lang.UnsupportedOperationException
    at java.util.Collections$UnmodifiableList.remove(Collections.java:1162)
    at prototype.dynamictree.model.Organisation.removeChild(Organisation.java:152)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:191)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
    at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 174 more

Here is my xhtml code:

             <rich:tree id="dynamicTree" ajaxSubmitSelection="true" ajaxSingle="true"
                    swichType="server"
                    nodeSelectListener="#{dynamicTree.processNodeSelection}"
                    rightClickSelection="true">

                    <rich:recursiveTreeNodesAdaptor roots="#{rootOrganisation}"
                        id="dynamicRecursiveTree"
                        switchType="server"
                        var="_rootOrganisation">
                        <rich:treeNode>
                            <h:outputText value="MENU" />

                            <rich:componentControl disableDefault="true"
                                event="oncontextmenu" for="#{_rootOrganisation.type}ContextMenu"
                                operation="show" />
                        </rich:treeNode>

                        <rich:recursiveTreeNodesAdaptor
                            roots="#{_rootOrganisation.children}" var="_childOrganisation"
                            nodes="#{_childOrganisation.children}">

                            <rich:treeNode>
                                <h:outputText value="#{_childOrganisation.item.name}" />

                                <rich:componentControl disableDefault="true"
                                    event="oncontextmenu"
                                    for="#{_childOrganisation.type}ContextMenu" operation="show" />
                            </rich:treeNode>

                        </rich:recursiveTreeNodesAdaptor>
                    </rich:recursiveTreeNodesAdaptor>
                </rich:tree>

Thank you for your help