@Override
        public Integer decode(JsonNode node) throws JsonMappingException {
            if (node.isInt()) {
                return node.intValue();
            }
            throw throwJsonMappingException(Integer.class.getSimpleName(), node);
        }
Decode the JSON node provided into an instance of `T`.

@throws JsonMappingException if `node` cannot be decoded into `T`.
server-common/src/main/java/org/apache/kafka/server/util/json/DecodeJson.java