OBJECT_MAPPER.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);
OBJECT_MAPPER.configure(DeserializationFeature.ACCEPT_FLOAT_AS_INT, false);
OBJECT_MAPPER.configure(SerializationFeature.WRAP_ROOT_VALUE, true);
+ OBJECT_MAPPER.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
}