Jackson deserializer of the inner field

    public static class ModelToString extends JsonSerializer<Model> {
        @Override
        public void serialize(Model value,
                              JsonGenerator gen,
                              SerializerProvider serializers) throws IOException, JsonProcessingException {
            System.out.println("value = " + value);
            gen.writeStartObject();
            gen.writeFieldName("rate1");
            gen.writeNumber(value.rate);
            gen.writeFieldName("count1");
            gen.writeNumber(value.count);
            gen.writeFieldName("content1");
            gen.writeObject(value.content);
            gen.writeEndObject();
        }
    }

    public static class ModelFromString<T> extends JsonDeserializer<Model<T>> {
        @Override
        public Model<T> deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
            Model<T> m = new Model<>();
            String t1 = p.nextFieldName();
            p.nextToken();
            m.rate = p.getDoubleValue();
            String t3 = p.nextFieldName();
            p.nextToken();
            m.count = p.getIntValue();
            String t5 = p.nextFieldName();
            p.nextToken();
            m.content = ctxt.readValue(p, (Class<T>) Content.class);
            return m;
        }
    }

    public static class Content {
        @JsonSerialize(using = LocalDateTimeSerializerToString.class)
        @JsonDeserialize(using = LocalDateTimeDeserializerFromString.class)
        public LocalDateTime time;

        public Content() {
        }
    }

    public static class Model<T> {
        public Double rate;
        public Integer count;
        public T content;
        public Model() {
        }
    }

    public static class My {
        @JsonSerialize(using = ModelToString.class)
        @JsonDeserialize(using = ModelFromString.class)
        Model model;

        public Model getModel() {
            return model;
        }
        public void setModel(Model rate) {
            this.model = rate;
        }
    }

    public static void main(String[] args) throws Exception {
        ObjectMapper om = new ObjectMapper();
        om.registerModule(new Jdk8Module());
        om.registerModule(new ParameterNamesModule());
        DeserializationConfig newConfig = om.getDeserializationConfig()
            .with();
        om.setConfig(newConfig);
        My my = new My();
        Model<Content> model = new Model<>();
        model.rate = 2.55;
        model.count = 42;
        Content content = new Content();
        content.time = LocalDateTime.now();
        model.content = content;
        my.setModel(model);
        String str = om.writeValueAsString(my);
        System.out.println("str = " + str);
        My my2 = om.readValue(str, My.class);
        System.out.println("my2 = " + my2);
    }