How to use

getNullValue

method

in

com.fasterxml.jackson.databind.deser.std.StringDeserializer

  protected String _deserializeFromArray(JsonParser p, DeserializationContext ctxt) throws IOException
  {
    JsonToken t;
    if (ctxt.hasSomeOfFeatures(FEATURES_ACCEPT_ARRAYS)) {
      t = p.nextToken();
      if (t == JsonToken.END_ARRAY) {
        if (ctxt.isEnabled(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT)) {
          return getNullValue(ctxt);
        }
      }
      if (ctxt.isEnabled(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS)) {
        final String parsed = _parseString(p, ctxt);
        if (p.nextToken() != JsonToken.END_ARRAY) {
          handleMissingEndArrayForSingle(p, ctxt);
        }
        return parsed;            
      }
    } else {
      t = p.getCurrentToken();
    }
    return (String) ctxt.handleUnexpectedToken(_valueClass, t, p, null);
  }
}