How to ignore properties with empty values during deserialization from JSON

Question

I'm trying to deserialize a JSON string into a ConcurrentHashMap object and I'm getting errors because my JSON contains properties with null values, but ConcurrentHashMap does not accept null values. Here is the fragment of code:

ObjectMapper mapper = new ObjectMapper();
return mapper.readValue(jsonString, ConcurrentHashMap.class);

Is there a way to ignore properties with null values during deserialization? I know that we can ignore these properties during serialization:

mapper.setSerializationInclusion(JsonInclude.NON_NULL);

But what about deserialization process?

Answer 1

There may be a better way but a workaround would be:

Map<String, Object> map = mapper.readValue(jsonString, HashMap.class);
map.values().removeIf(o -> o == null);
return new ConcurrentHashMap<> (map);