Handling Data Serialization in Spring Boot REST API for Machine Learning Model Input
I'm experimenting with Quick question that's been bugging me - I'm sure I'm missing something obvious here, but Currently developing a RESTful API in Spring Boot that will serve predictions from a machine learning model. The model expects input in a specific JSON format, and I'm running into issues with how data is serialized from incoming requests. For example, the expected input structure is: ```json { "features": [ 0.1, 0.2, 0.3 ], "threshold": 0.5 } ``` However, when sending data via a POST request, the default serialization seems to be inconsistent, leading to unexpected null values in my model's input. Here’s a snippet of my controller method: ```java @PostMapping("/predict") public ResponseEntity<PredictionResponse> predict(@RequestBody InputData inputData) { PredictionResponse response = model.predict(inputData); return ResponseEntity.ok(response); } ``` The `InputData` class looks like this: ```java public class InputData { private List<Double> features; private Double threshold; // getters and setters } ``` I've tried using `@JsonProperty` annotations to ensure that the JSON keys match the Java fields, but the issue persists. Also, I've enabled debug logging for Jackson, and it shows that the incoming JSON is indeed being parsed, but not correctly mapped to my `InputData` class. I’m using Spring Boot version 2.5.4 and Jackson 2.12.3. To further troubleshoot, I tested the serialization manually by creating a simple controller that returns the raw input data: ```java @PostMapping("/test") public ResponseEntity<InputData> test(@RequestBody InputData inputData) { return ResponseEntity.ok(inputData); } ``` The returned response had the expected values when I tested it with tools like Postman, but when integrated into the prediction flow, something still goes wrong. Several online resources hint that this might be a configuration issue with Jackson’s ObjectMapper, but I couldn't find the right settings. Any advice on how to ensure that the incoming requests are correctly deserialized into my `InputData` object? For context: I'm using Java on Ubuntu. Any ideas what could be causing this? My development environment is Windows. Am I missing something obvious? This issue appeared after updating to Java LTS.