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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"jackson-dataformat-msgpack can't handle numbers as String type","articleBody":"I found this code fails while it works with replacing `new ObjectMapper(new MessagePackFactory())` with `new ObjectMapper()`.\r\n\r\n```\r\n    public static class MyIntegerSerializer\r\n        extends JsonSerializer\u003cInteger\u003e\r\n    {\r\n        @Override\r\n        public void serialize(Integer value, JsonGenerator gen, SerializerProvider serializers)\r\n                throws IOException, JsonProcessingException\r\n        {\r\n            gen.writeNumber(String.valueOf(value));\r\n        }\r\n    }\r\n\r\n    public static class MyIntegerDeserializer\r\n            extends JsonDeserializer\u003cInteger\u003e\r\n    {\r\n        @Override\r\n        public Integer deserialize(JsonParser p, DeserializationContext ctxt)\r\n                throws IOException, JsonProcessingException\r\n        {\r\n            return p.getNumberValue().intValue();\r\n        }\r\n    }\r\n\r\n    public static void main(String[] args)\r\n            throws IOException\r\n    {\r\n        ObjectMapper objectMapper = new ObjectMapper(new MessagePackFactory());\r\n        objectMapper.registerModule(\r\n                new SimpleModule()\r\n                        .addSerializer(Integer.class, new MyIntegerSerializer())\r\n                        .addDeserializer(Integer.class, new MyIntegerDeserializer())\r\n        );\r\n        ByteArrayOutputStream out = new ByteArrayOutputStream();\r\n        objectMapper.writeValue(out, 42);\r\n\r\n        Integer integer = objectMapper.readValue(out.toByteArray(), Integer.class);\r\n        System.out.println(integer);\r\n    }\r\n\r\n\u003e\u003e\u003e\u003e com.fasterxml.jackson.databind.JsonMappingException: writeNumber(String encodedValue) isn't supported yet\r\n```","author":{"url":"https://github.com/komamitsu","@type":"Person","name":"komamitsu"},"datePublished":"2017-05-11T06:33:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/421/msgpack-java/issues/421"}