Spring Boot - Font Awesome OTS parsing error: Failed to convert

The issue is that Maven was filtering the font files and corrupting them.

    <resource>
        <directory>${project.basedir}/src/main/resources</directory>
        <filtering>true</filtering>
    </resource>

The fix was to make the following changes to the pom.xml

    <resource>
        <directory>${project.basedir}/src/main/resources</directory>
        <filtering>true</filtering>
        <excludes>
            <exclude>static/fonts/**</exclude>
        </excludes>
    </resource>

    <resource>
        <directory>${project.basedir}/src/main/resources</directory>
        <filtering>false</filtering>
        <includes>
            <include>static/fonts/**</include>
        </includes>
    </resource>

This change allows for the fonts to not be filtered during packaging.

Another way to do it is update the configuration of the maven-resources-plugin as follows:

<plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-resources-plugin</artifactId>
     <configuration>
          <nonFilteredFileExtensions>
               <nonFilteredFileExtension>ttf</nonFilteredFileExtension>
               <nonFilteredFileExtension>woff</nonFilteredFileExtension>
               <nonFilteredFileExtension>woff2</nonFilteredFileExtension>
          </nonFilteredFileExtensions>
     </configuration>
</plugin>