JSP: EL expression is not evaluated [duplicate]

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I know it’s supposed to be on by default, but I run across pages now and again (or even the same page that changes behavior) where the EL processing doesn’t happen. Adding the following to the top of any such pages should resolve the issue:

<%@ page isELIgnored="false" %>

I add it to every page because it doesn’t hurt, and I still don’t know the root cause that occasionally causes a page to stop interpreting the EL expressions.

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