_kryo.register( Collections.EMPTY_MAP.getClass(), new CollectionsEmptyMapSerializer() );
_kryo.register( Collections.EMPTY_SET.getClass(), new CollectionsEmptySetSerializer() );
_kryo.register( Collections.singletonList( "" ).getClass(), new CollectionsSingletonListSerializer() );
_kryo.register( Collections.singleton( "" ).getClass(), new CollectionsSingletonSetSerializer() );
_kryo.register( Collections.singletonMap( "", "" ).getClass(), new CollectionsSingletonMapSerializer() );
_kryo.register( BigDecimal.class, new BigDecimalSerializer() );
_kryo.register( BigInteger.class, new BigIntegerSerializer() );
_kryo.register( Pattern.class, new RegexSerializer() );
_kryo.register( BitSet.class, new BitSetSerializer() );
_kryo.register( URI.class, new URISerializer() );
_kryo.register( UUID.class, new UUIDSerializer() );