How to Use Font Awesome Icons from webjars.org in a JSF Application Without External Server Reliance?

Using Font Awesome from webjars.org with JSF

Introduction
Integrating Font Awesome icons into your JSF application can enhance its visual appeal and enhance user experience. However, relying on external servers for these resources is not ideal. This article explores a solution using the webjars project to bundle the necessary resources within your WAR file.

Issue
Using the following code to include Font Awesome:

<outputstylesheet library="webjars" name="font-awesome/3.2.1/css/font-awesome.css"></outputstylesheet>

resulted in broken icons and console errors indicating the fonts were not being found at the specified paths:

GET http://DOMAIN:PORT/CONTEXT-ROOT/javax.faces.resource/font-awesome/3.2.1/font/fontawesome-webfont.woff?v=3.2.1 404 (Not Found)
...

Solution
The problem lies in the missing JSF mapping and library name in the resource URLs. To resolve this, use the #{resource} expression in the CSS file to generate proper JSF resource URLs:

src: url("#{resource['webjars:font-awesome/3.2.1/font/fontawesome-webfont.eot']}&v=3.2.1");
...

However, as this involves editing the source code, an alternative solution is to utilize the OmniFaces library's UnmappedResourceHandler:

1. Install OmniFaces (e.g., using Maven)
2. Register UnmappedResourceHandler in faces-config.xml:

<application>
    <resource-handler>org.omnifaces.resourcehandler.UnmappedResourceHandler</resource-handler>
</application>

3. Add /javax.faces.resource/* to FacesServlet mapping:

<servlet-mapping>
    <servlet-name>facesServlet</servlet-name>
    <url-pattern>/javax.faces.resource/*</url-pattern>
    <url-pattern>*.xhtml</url-pattern>
</servlet-mapping>

4. Move the library name to the resource name in the tag:

<outputstylesheet name="webjars/font-awesome/3.2.1/css/font-awesome.css"></outputstylesheet>

By following these steps, the Font Awesome icons should now render correctly within your JSF application, without the need to rely on external servers.

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