factories.add(TypeAdapters.NUMBER_FACTORY);
factories.add(TypeAdapters.CHARACTER_FACTORY);
factories.add(TypeAdapters.STRING_BUILDER_FACTORY);
factories.add(TypeAdapters.STRING_BUFFER_FACTORY);
factories.add(TypeAdapters.newFactory(BigDecimal.class, new BigDecimalTypeAdapter()));
factories.add(TypeAdapters.newFactory(BigInteger.class, new BigIntegerTypeAdapter()));
factories.add(TypeAdapters.JSON_ELEMENT_FACTORY);
factories.add(ObjectTypeAdapter.FACTORY);
// user's type adapters
factories.addAll(typeAdapterFactories);