Structure validation: duplicate key

If there are duplicate keys in the JSON, the current JSON parser will take the value corresponding to the first occurrence of the key:

inputString:

public class SimdJsonTest {

    static final SimdJsonParser SIMD_PARSER = new SimdJsonParser();
    static final ObjectMapper JACKSON = new ObjectMapper();
    static final Gson GSON = new GsonBuilder().create();

    public static void main(String[] args) throws IOException {

        String json = "{\"num\": 2, \"num\": 123}";
        byte[] bytes = json.getBytes();
        JsonValue value = SIMD_PARSER.parse(bytes, bytes.length);

        System.err.println("[simd].size = " + value.getSize());   // 2
        System.err.println("[simd].num = " + value.get("num"));  // 2

        Map jcsObj = JACKSON.readValue(bytes, Map.class);
        System.err.println("[jackson].size = " + jcsObj.size());   // 1
        System.err.println("[jackson].num = " + jcsObj.get("num"));   // 123

        // will throw exception: com.google.gson.JsonSyntaxException: duplicate key: num
        Map gsonObj = GSON.fromJson(new String(bytes), Map.class);
        System.err.println("[gson].size = " + gsonObj.size());
        System.err.println("[gson].num = " + gsonObj.get("num"));
    }
}

The content of the console output：

[simd].size = 2 [simd].num = 2 [jackson].size = 1 [jackson].num = 123 Exception in thread "main" com.google.gson.JsonSyntaxException: duplicate key: num ...

simdjson / simdjson-java

Structure validation: duplicate key #37