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[Struts 2] How to populate select control after selection of a value in another select control

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I'm a newbie in Struts 2 and I don't find a good way to link <s:select> on my JSP page.

I have 3 <s:select> populated via 3 linked hierarchic tables : GROUP (id_group, group) > CATEGORY (id_category, id_group, category) > SKILL (id_skill, id_category, skill)

Here is my JSP page, a classic search & list form :

My java class contains methods :

listSkill(), listCategory(), listGroup() and associated Getter and Setter.

When I select a Group, I would like the <select> that display categories only contains categories of the selected Group.
Same thing for Category and Skills.

Thanks a lot !
Ranch Hand
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You need to use javascript.

Nicolas Benhamou
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According to me, a full javascript solution is not a good one. I would like to minimize client role.
Of course, I tried to do that kind of thing :

On my <select> onchange event :

In my listCategory java method, I retrieve the selected idGroup via the associated getter and then, I load the List<Category>.
Finally I set the list with new values.

In Ecclipse debug mode, the list is the right one but on my jsp page, the <select> is not refreshed.

Maybe a cache problem ?

Thanks !

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