How to fix Font Awesome 404 errors in JSF when using Webjars?

Accessing Font Awesome Resources in JSF using Webjars

Issue:

When attempting to include Font Awesome icons in a JSF application using the pre-built webjars JAR, font resources are not being found. Despite the CSS file being accessible, subsequent requests for font files result in 404 errors.

Solution:

To ensure proper mapping and resolution of font resources, follow these steps:

1. Use JSF Resource URL:

   Modify the CSS file references to use #{resource}. This will instruct JSF to generate the correct resource URL, including the proper JSF library mapping:

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

2. Install OmniFaces:

   Add the OmniFaces dependency to your pom.xml:

   <dependency>
       <groupId>org.omnifaces</groupId>
       <artifactId>omnifaces</artifactId>
       <version><!-- Check omnifaces.org for current version. --></version>
   </dependency>

3. Register UnmappedResourceHandler:

   In faces-config.xml, register the OmniFaces UnmappedResourceHandler:

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

4. Update Servlet Mapping:

   In web.xml, include /javax.faces.resource/* in your FacesServlet mapping:

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

5. Move Library Name:

   In your h:outputStylesheet tag, move the library name into the resource name:

   <h:outputStylesheet name="webjars/font-awesome/3.2.1/css/font-awesome.css" />

By implementing these steps, you can effectively access Font Awesome resources within your JSF application using the webjars JAR, ensuring the proper resolution of font files.

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