How to Resolve the Missing Font Files Error When Integrating Font Awesome in JSF?

Font Awesome Integration in JSF: Resolving Missing Font Files Error

When incorporating Font Awesome into a JSF application, you may encounter an issue where the browser cannot locate the associated font files, resulting in empty squares instead of the expected icons. This occurs because the default Font Awesome CSS file references font files using relative paths, which is not supported when accessing the CSS file via JSF.

Root Cause:

The JSF component adds a special prefix to the path of the CSS file when using the library attribute. This prefix directs requests to the JSF resource handler, which allows customization options. However, this causes issues with the Font Awesome CSS path references.

Solution:

To resolve this issue, you need to modify the Font Awesome CSS file to use the JSF Expression Language (EL) #{resource} mapping to reference font files in the "/resources" folder using the appropriate library and resource name. Additionally, you may need to replace the question mark (?) with an ampersand (&) in references where the library name is used as a query string parameter.

Updated CSS Path References:

<code class="css">@font-face {
  font-family: 'FontAwesome';
  src: url("#{resource['font-awesome:fonts/fontawesome-webfont.eot']}&v=4.3.0");
  src: url("#{resource['font-awesome:fonts/fontawesome-webfont.eot']}&#iefix&v=4.3.0") format('embedded-opentype'),
       url("#{resource['font-awesome:fonts/fontawesome-webfont.woff2']}&v=4.3.0") format('woff2'),
       url("#{resource['font-awesome:fonts/fontawesome-webfont.woff']}&v=4.3.0") format('woff'),
       url("#{resource['font-awesome:fonts/fontawesome-webfont.ttf']}&v=4.3.0") format('truetype'),
       url("#{resource['font-awesome:fonts/fontawesome-webfont.svg']}&v=4.3.0#fontawesomeregular") format('svg');
  font-weight: normal;
  font-style: normal;
}</code>

Additional Considerations:

• Restart the server after modifying the CSS file.
• Add mime mappings to web.xml for font file types if you encounter JSF1091 warnings.
• If using OmniFaces, consider installing the UnmappedResourceHandler and reconfiguring the FacesServlet mapping.

Further Reading:

• [How to use Font Awesome from webjars.org with JSF](https://stackoverflow.com/questions/18245236/display-font-awesome-icon-in-xhtml-jsf-with-jsf-value)

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