the attribute item of the tag <c:forEach> and java code to keep the dll dynamic

Question

the problem I found is exactly in the attribut items of the tag forEach because I use a class java to build my options dynamically so I have not the options from the begining to put them in the items I tried the following: <%=h.ConstructListActivity("Activity","SELECT from Activityopc activityopc".toString()) %>' var="option"> but it doesn't work. I use JSTL and the EL at the same time I want to keep the ddl dynamic. So is there any suggestion to the item attribute and it is really able to receive a java code.

Thanks