How to HTML-encode in the JSP expression language?

Question

Consider the following piece of JSP:

The value of ${flashVars} conta

Answer 1

Use fn:escapeXml().

<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
...
<param name="FlashVars" value="${fn:escapeXml(flashVars)}" />