Why having NPE at jstl?

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I simply don't understand why this is not correct. Javax.servlet. ServletException: java.lang.

Exception: javax.faces. FacesException: Problem in renderResponse: /WEB-INF/jsf/userapp-main. Jsf @40,44 items="${fn:split('test,test,', ',')}" java.lang.

NullPointerException jstl link|improve this question asked Feb 27 at 13:04Cristian Boariu2,1182628 67% accept rate.

Well, seems that I forgot to declare fn: xmlns:fn="java.sun.com/jsp/jstl/functions" I would have expected something like tag not defined instead of a generic NPE.

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