👀 Views: 34 💬 Answers: 1 📅 Created: 2025-06-10

java jackson json deserialization Java

I'm converting an old project and I've tried everything I can think of but I'm updating my dependencies and Quick question that's been bugging me - I'm working on a project and hit a roadblock... I'm working with a question with deserializing a nested JSON structure into my Java objects using Jackson. The JSON I'm trying to parse looks like this: ```json { "user": { "id": 1, "name": "John Doe", "address": { "street": "123 Main St", "city": "Springfield" } } } ``` I have the following classes to represent the data: ```java public class User { private int id; private String name; private Address address; // Getters and Setters } public class Address { private String street; private String city; // Getters and Setters } ``` I’m using the `ObjectMapper` to deserialize this JSON string: ```java ObjectMapper objectMapper = new ObjectMapper(); User user = objectMapper.readValue(jsonString, User.class); ``` However, I'm getting the following exception: ``` com.fasterxml.jackson.databind.JsonMappingException: Unrecognized field "address" (class User), not marked as ignorable ``` I've checked the field names and ensured they match the JSON structure. I've also tried adding the `@JsonProperty` annotation to the `address` field in the `User` class without any success. I confirmed that both classes have default constructors and the necessary getters and setters. What might be causing this scenario? Is there a specific configuration in Jackson that I need to tweak to handle nested objects correctly? Also, is it necessary to have the same field names in the JSON and Java classes, or can I use custom names with annotations? Any help would be appreciated! My development environment is Windows. How would you solve this? This is part of a larger application I'm building. Am I missing something obvious? This is for a desktop app running on Ubuntu 20.04. I'm coming from a different tech stack and learning Java. Any feedback is welcome! This is for a service running on Windows 10. I appreciate any insights!