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Код


                    <rich:tree>
                                    <rich:treeNodesAdaptor nodes="#{city.childs}" var="qwe">
                                        <rich:treeNode dragType="qwe" dragIndicator="indicator" dropValue="#{qwe.id}">
                                            <rich:dndParam name="qwe_label" value="#{qwe.name}"/>
                                            <h:outputText value="#{qwe.name}" id="indicator_#{qwe.id}" />
                                        </rich:treeNode>
                                    </rich:treeNodesAdaptor>
                    </rich:tree>

Код


 public void processDrop(DropEvent event){
        System.out.println("getDragValue "+event.getDragValue()); //null
        System.out.println("getDragType "+event.getDragType()); // null

        System.out.println("getDropValue "+event.getDropValue()); // null
        System.out.println("qweqweqwe"+event); // не null

        System.out.println("qweqweqwe"+event.getComponent().getAttributes().get("qwe")); // null
        
        System.out.println("qweqweqwe"+event.getComponent().getAttributes().size()); // 1

        for(Object obj:event.getComponent().getChildren()){
            System.out.println("qweqweqwe"+obj.getClass()); // javax.faces.component.html.HtmlPanelGrid
            System.out.println("qweqweqwe"+obj); // javax.faces.component.html.HtmlPanelGrid@18655e
        }
        for(Object obj:event.getComponent().getAttributes().values()){
            System.out.println("qweqweqwe"+obj.getClass()); // java.lang.String
            System.out.println("qweqweqwe"+obj); // 29b7ef5c
        }
        for(Object obj:event.getComponent().getAttributes().keySet()){
            System.out.println("qweqweqwe"+obj.getClass()); // java.lang.String
            System.out.println("qweqweqwe"+obj); // com.sun.facelets.MARK_ID
        }
    }