private static ObjectMapper createVanillaObjectMapper() {
        return new ObjectMapper(new YAMLFactory())
                .registerModule(new Jdk8Module()); // Needed to deal with Optional<...>
    }
No configurations apart from registering {@link Jdk8Module} for {@link java.util.Optional}
use.
stroom-util/src/main/java/stroom/util/yaml/YamlUtil.java