How to get treedata correctly

[xxhh11]

Hi all, i am using apache tomahawk tree2 component and i get the tree item from DB. The code like:

public TreeNode getTreeData() {
		List list = getMenuList();
		TreeNode treeData = new TreeNodeBase("foo-folder", "Inbox", false);
		Iterator it = list.iterator();
		HashMap menuTable = new HashMap();
		while (it.hasNext()) {
			Eosmenu item = (Eosmenu) it.next();
			String label = item.getMenuLabel();
			boolean isLeaf = item.getIsLeaf() != null
					&& item.getIsLeaf().equalsIgnoreCase("Y");
			int level = item.getMenuLevel();
			String menuId = item.getMenuId();
			String parentsID = item.getParentsId();
			TreeNodeBase node = new TreeNodeBase();
			if(isLeaf){
				node.setType("document");
			}else{
				node.setType("bar-folder");
			}
			node.setDescription(label);
			node.setLeaf(isLeaf);
			menuTable.put(menuId, node);
			if (level == 1) {
				treeData.getChildren().add(node);
			} else {
				TreeNodeBase pItem = (TreeNodeBase) menuTable.get(parentsID);
				if (pItem != null)
					pItem.getChildren().add(node);
			}
		}
		return treeData;
	}

This works well only when the items are in the front of their chirdren. How to let it works correctly when the data in the database like :
id------menuid-------menuname------menulevel------parentid
1----------b---------------bb-------------------2------------------a
2----------a---------------aa-------------------1------------------0