public static void close() {
        if (null != cachedShimService)
            cachedShimService.close();
        cachedShimService = null;
        configuration = null;
    }
Set this system property to the fully-qualified name of a {@link KryoShimService}
package-and-classname to force it into service.  Setting this property causes the
priority-selection mechanism ({@link KryoShimService#getPriority()}) to be ignored.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/gryo/kryoshim/KryoShimServiceLoader.java