using JSF EL expression inside web.xml

Can I use EL expression inside web.xml ? Like this

Web.xml

<context-param>
        <param-name>primefaces.DIR</param-name>
        <param-value>#{userUtilityBacking.direction}</param-value>
</context-param>

and my JSF bean like this

JSF bean

@ManagedBean(name="userUtilityBacking")
@SessionScoped
public class UserUtilityBacking  implements Serializable {

     private static final long serialVersionUID = 1L;
    private String direction  ;   
// and public setters and getter

Will it work ?

Can I use EL expression inside web.xml ?

Not exactly that. By default, the servletcontainer doesn't EL-evaluate the context parameters when the web.xml is been parsed during application startup. However, build tools like Ant and Maven and some servletcontainers like JBoss (after setting a specific configuration setting) support using ${...} syntax similar to EL to inline environment variables and/or VM arguments by their name in several deployment descriptor XML files such as web.xml, ejb-jar.xml and persistence.xml. Note: that are thus not those variables which you've declared in JSF EL scope, such as managed bean.

Will it work ?

It will only work if PrimeFaces gets the static value "#{userUtilityBacking.direction}" as String and then programmatically EL-evaluates it in the current EL context using for example Application#evaluateExpressionGet(). But, based on the PrimeFaces 3.5 source code, it is not doing that anywhere. It look like they implemented it for 4.x only.

In your particular case, you'd better just specify the direction directly on <html> element to apply it document-wide and/or in dir attribute of an arbitrary HTML or JSF component.

<html dir="#{userUtilityBacking.direction}">

using JSF EL expression inside web.xml

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