ZK - Open Source Ajax Java Framework

Hi!
Anyone can I tell me if I can use jstl tags undex .zul files?
is it posible?
thanks!!!

The simple answer is NO, zul page is not based on JSP Technology and Zul is Component based, not Text based.

But in Zul document, all JSTL's functionalities like if, else, foreach, are already supported(actually Zul is more powerful).

you don't have to use JSTL, you can use EL with other ZK's features, please check them in ZK's Dev Guide.
Main Page of Documentation

use jsp component

The JSTL is not working in zul file , but we have a alternate for using ZK web core taglib in zul file,

Please reference to
http://books.zkoss.org/wiki/ZUML_Reference/ZUML/Processing_Instructions/taglib

My two cents... switch to ZK, we used to use jstl in plain JSP but ZK is definitively more powerful and integrated.