ImportConstants In older EL versions (< 3.0), it's not possible to use constants or any other static fields/methods in an EL expression.
As it is not really "cool" to create beans with getter/setter for each constants class, we provide an utils tag which allows to import constant fields in a page.

The constants can be accessed via the name of the class (default setting) or via a custom name (var attribute).
LIBRARY: primefaces
<p:importConstants type="org.primefaces.util.Constants" var="PFConstants" />

<h:outputText value="#{PFConstants.LIBRARY}" />

<br />

<h:outputText value="#{PFConstants.DOWNLOAD_COOKIE}" />
PrimeTek, Copyright © 2017
All rights reserved.
Running PrimeFaces-6.3-SNAPSHOT on Mojarra-2.3.2.