implementing Jackson Deserialization for Nested Objects in Java 17 Spring Boot Application
I'm writing unit tests and I'm confused about I'm working with a question with deserializing a nested JSON object using Jackson in my Spring Boot application. My JSON structure resembles the following: ```json { "userId": 1, "userDetails": { "firstName": "John", "lastName": "Doe" } } ``` I'm trying to map this JSON into a Java class structure that looks like this: ```java public class User { private int userId; private UserDetails userDetails; // Getters and Setters } public class UserDetails { private String firstName; private String lastName; // Getters and Setters } ``` When I make a POST request with the above JSON, I am getting a `HttpMessageNotReadableException` with a message indicating that Jackson want to deserialize the `userDetails` property. I've double-checked the JSON structure, and it seems correct. Additionally, I've ensured that I have the Jackson dependency in my `pom.xml`: ```xml <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.13.0</version> </dependency> ``` I've also tried annotating the `UserDetails` class with `@JsonProperty` to specify getters explicitly, but that hasn’t resolved the scenario. Here’s how I’m making the request in my controller: ```java @PostMapping("/users") public ResponseEntity<User> createUser(@RequestBody User user) { // Logic to save user return ResponseEntity.ok(user); } ``` I've also enabled debug logging for Spring and Jackson, but I don’t see any additional clues in the logs. What could be causing this deserialization behavior? Any suggestions on how to resolve this scenario would be greatly appreciated! I'm using Java stable in this project. Any suggestions would be helpful. For reference, this is a production desktop app. For context: I'm using Java on Windows 10.