JSF 2 - How can I get a context-param value from web.xml using JSF EL?

Question

I would like to declare some constant values used by my JSF 2 webapp inside the web.xml file like so:

<web-app>     <context-param>         <param-name>myconstantkey</param-name>         <param-value>some string value</param-value>     </context-param> </web-app> 

Getting these values from inside a backing bean is easy enough:

FacesContext ctx = FacesContext.getCurrentInstance(); String myConstantValue =     ctx.getExternalContext().getInitParameter("myconstantkey"); 

How do I achieve the same thing from inside a Facelets page using JSF EL to get the value?

Answer 1

Steve Taylor's answer does indeed work, but there is a simpler way using the JSF EL pre-defined object initParam.

<h:outputText value="#{initParam['myconstantkey']}" /> 

Originally this wasn't working for me because I forgot to put the single quotes around the key name and was getting back an empty string. This solution should also work with key values that contain dot characters.

Answer 2

#{facesContext.externalContext.initParameterMap.myconstantkey}