presto-hive/src/main/java/io/prestosql/plugin/hive/s3/HiveS3Module.java/HiveS3Module/validateEmrFsClass
class HiveS3Module:    private static void validateEmrFsClass()
    {
        // verify that the class exists
        try {
            Class.forName(EMR_FS_CLASS_NAME, true, JavaUtils.getClassLoader());
        }
        catch (ClassNotFoundException e) {
            throw new RuntimeException("EMR File System class not found: " + EMR_FS_CLASS_NAME, e);
        }
    }