Try with DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY
– it should work for you.
Example:
final String json = "{\"date\" : \"2013-05-11\",\"value\" : 123}";
final ObjectMapper mapper = new ObjectMapper()
.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
final List<Point> points = mapper.readValue(json,
new TypeReference<List<Point>>() {});