René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Concerns regarding the way jsoniter is implemented for high performance parsing","articleBody":"So my pom.xml has following dependencies:\r\n```\r\n\u003cdependency\u003e\r\n    \u003cgroupId\u003ecom.jsoniter\u003c/groupId\u003e\r\n    \u003cartifactId\u003ejsoniter\u003c/artifactId\u003e\r\n    \u003cversion\u003e0.9.23\u003c/version\u003e\r\n\u003c/dependency\u003e\r\n\r\n\u003cdependency\u003e\r\n    \u003cgroupId\u003eorg.javassist\u003c/groupId\u003e\r\n    \u003cartifactId\u003ejavassist\u003c/artifactId\u003e\r\n    \u003cversion\u003e3.29.2-GA\u003c/version\u003e\r\n\u003c/dependency\u003e\r\n```\r\n\r\nFollowing is a class I wrote to do a simple test with _**javaassist**_ enabled\r\n\r\n```\r\npublic class Json {\r\n    public static void main(String[] args) {\r\n\r\n\r\n        System.out.println(JsoniterSpi.getDefaultConfig().decodingMode()); // REFLECTION_MODE\r\n        System.out.println(JsoniterSpi.getDefaultConfig().encodingMode()); // REFLECTION_MODE\r\n\r\n        JsonIterator.setMode(DecodingMode.DYNAMIC_MODE_AND_MATCH_FIELD_WITH_HASH);\r\n        JsonStream.setMode(EncodingMode.DYNAMIC_MODE);\r\n\r\n        String json = \"{\\\"id\\\":1,\\\"name\\\":{\\\"firstName\\\":\\\"Joe\\\",\\\"surname\\\":\\\"Blogg\\\"}}\";\r\n\r\n        Student student = JsonIterator.deserialize(json, Student.class); // decoding to Student.class\r\n\r\n        Any any = JsonIterator.deserialize(json); // decoding to any\r\n\r\n        System.out.println(student);\r\n        System.out.println(any);\r\n    }\r\n\r\n    @ToString\r\n    public static class Name {\r\n        private String firstName;\r\n        public String surname;\r\n    }\r\n\r\n    @ToString\r\n    public static class Student {\r\n        public int id;\r\n        public Name name;\r\n    }\r\n}\r\n```\r\n\r\nI got the following answer:\r\n```\r\nREFLECTION_MODE\r\nREFLECTION_MODE\r\nJson.Student(id=1, name=Json.Name(firstName=null, surname=Blogg))\r\n{\"id\":1,\"name\":{\"firstName\":\"Joe\",\"surname\":\"Blogg\"}}\r\n```\r\n\r\nMy key takeaways:\r\n\r\n1. By default REFLECTION_MODE is used\r\n2. When javaassist is added, I have to enable flags to open java modules. For example, `--add-opens java.base/java.lang=ALL-UNNAMED`\r\n3. The attributes of a class should be public if we serialize/deserialize using javaassist \r\n\r\n**Question 1:**\r\nI need to verify above points and whether or not I understand them correctly. I need the absolute fastest possible encoding/decoding speeds. _Is the way I utilized above libraries correct?_\r\n\r\n**Question 2:**\r\nSuppose I just want to use simple lazy parsing with Any like this: `Any any = JsonIterator.deserialize(json);`, _does javaassist still make a difference in speed here?_ Provided I do not map to any of my clsses. Just keep deserializing to Any object and use it like a Hashmap. In simple terms I only want to use **Any** and **Iterator** APIs. _Do I still need javaassist to get the performance boost?_\r\n\r\nSources:\r\n1. https://www.sitepoint.com/php-style-json-parsing-in-java-with-jsoniter/\r\n2. https://www.baeldung.com/java-jsoniter","author":{"url":"https://github.com/ahrooran-r","@type":"Person","name":"ahrooran-r"},"datePublished":"2023-04-07T18:55:11.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/342/java/issues/342"}