Why the code on JSP doesn't work?

I have a set of code to retrieve a session data. In the servlet, the code is the following:
Shop shop = shopService.getShop();
if (shop == null)
throw new ServletException("shop not found in session");
request.getSession().setAttribute("subCategoryList", shop.getSubCategories());where the shopService is an application scope data while the shop is a session scope data.
I mvoe the above code to a JSP file with JSTL as
<c:set value="${applicationScope['shopService']}" var="ss" />
<c:set value="${ss.shop.subCategories}" var="subCategoryList" />
<c:forEach var="subCat" items="${subCategoryList}">
<li><a href="<c:url value="/shop/admin/item/category/${subCat.id}/new"/>"><c:out value="${subCat.name}"/></a></li>
</c:forEach>
...and no data is shown. I can't figure out the reason.
Can anyone help me out of this problem?
Thanks

"no data is shown". Do you get an exception in the server log perhaps? This can happen when the response has already been flushed to the browser, it will not display the stacktrace in the page anymore.

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