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Iterate HashMap in jsp - Struts2  RSS feed

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In my application I have to display menu items from database

Each menu Item(MenuVO) will have a menu-id(menuId), parent-menu-id(parentMenuId), menu-order(menuOrder).

I have a hashmap which contains a menu item as the key and sub menus as ArrayList of menus.

But the submenu items can also be a parent for a list of sub-sub-menu items.

How can I iterate this recursive HashMap in JSP/java(I can create a custom tag).

The menu will be displayed as

I know the menu goes only 4 or 5 levels deep but I dont want to hardcode 4 or 5 nested iterators in jsp.

Included screenshots for better understanding


Need to be arranged in below fashion and iterated in jsp(struts2)

This is also a similar thread


It is sorta covered in the JavaRanch Style Guide.
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