How to handle a NumberFormatException with Gson in deserialization a JSON response

Question

I\'m reading a JSON response with Gson, which returns somtimes a NumberFormatException because an expected int value is set to an empty string. Now

Answer 1

Here is example I did for Long type.This is better option:

    public class LongTypeAdapter extends TypeAdapter{
    @Override
    public Long read(JsonReader reader) throws IOException {
        if(reader.peek() == JsonToken.NULL){
            reader.nextNull();
            return null;
        }
        String stringValue = reader.nextString();
        try{
            Long value = Long.valueOf(stringValue);
            return value;
        }catch(NumberFormatException e){
            return null;
        }
    }
    @Override
    public void write(JsonWriter writer, Long value) throws IOException {
        if (value == null) {
            writer.nullValue();
            return;
        }
        writer.value(value);
    }
}

Register the adapter upon creation of the gson util:

Gson gson = new GsonBuilder().registerTypeAdapter(Long.class, new LongTypeAdapter()).create();

You can refer to this link for more.