👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-12

java jackson json record Java

I can't seem to get I've been struggling with this for a few days now and could really use some help. I'm working with an scenario while trying to serialize a Java 18 record using the Jackson library. I've defined a record for a simple user model like this: ```java public record User(String name, int age) {} ``` When I try to serialize this record to JSON, I expect the output to be something like: ```json {"name":"John Doe","age":30} ``` However, instead, I get the following output when using the `ObjectMapper`: ```json {"name":"John Doe","age":null} ``` I have already added the necessary Jackson dependency in my `pom.xml`: ```xml <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.13.0</version> </dependency> ``` And I am using the following code to perform the serialization: ```java import com.fasterxml.jackson.databind.ObjectMapper; public class Main { public static void main(String[] args) throws Exception { User user = new User("John Doe", 30); ObjectMapper objectMapper = new ObjectMapper(); String json = objectMapper.writeValueAsString(user); System.out.println(json); } } ``` I've also confirmed that the getters are correctly generated by the record, but it seems like Jackson is unable to map the `int` field correctly. I've tried various configurations of the `ObjectMapper`, including enabling the `FAIL_ON_NULL_FOR_PRIMITIVES` feature, but that doesn't seem to resolve the scenario. Is there something I'm missing in the configuration, or is this a known scenario with Jackson's handling of Java 18 records? Any advice on how to resolve this would be greatly appreciated! What's the best practice here? The stack includes Java and several other technologies. Any ideas how to fix this?