y run into classloading
 problems if any of the application's optional JAR files are missing. Because the container is not in a position to
 decide whether these types of classloading failures will prevent the application from working correctly, it must
 ignore them, while at the same time providing a configuration option that would log them.

 <p>
 Implementations of this interface must be declared by a JAR file resource located inside the
 <tt>META-INF/services</tt> directory and named for the fully quali