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How to reference constants in EL? (12 answers)
Closed 6 years ago.
I have a class that defines the names of various session attributes, e.g.
class Constants {
public static final String ATTR_CURRENT_USER = "current.user";
}
I would like to use these constants within a JSP to test for the presence of these attributes, something like:
<%@ taglib prefix="c" uri="
http://java.sun.com/jsp/jstl/core" %>
<%@ page import="com.example.Constants" %>
<%-- Do somthing --%>
But I can't seem to get the sytax correct. Also, to avoid repeating the rather lengthy tests above in multiple places, I'd like to assign the result to a local (page-scoped) variable, and refer to that instead. I believe I can do this with , but again I'm struggling to find the correct syntax.
UPDATE: Further to the suggestion below, I tried:
which didn't work. So instead, I tried substituting the literal value of the constant. I also added the constant to the content of the page, so I could verify the constant's value when the page is being rendered
<%= "Constant value: " + WebHelper.ATTR_CURRENT_PARTNER %>
This worked fine and it printed the expected value "current.user" on the page. I'm at a loss to explain why using the String literal works, but a reference to the constant doesn't, when the two appear to have the same value. Help.....
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