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how to to Deserialize JSON Array into List of Custom Objects Using Jackson in Java 17

👀 Views: 1 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-07
jackson json java-17 java

I'm not sure how to approach I am working with an scenario while trying to deserialize a JSON array into a `List<MyCustomObject>` using Jackson in my Java 17 application. The JSON structure I am receiving is as follows: ```json [ { "id": 1, "name": "Object1" }, { "id": 2, "name": "Object2" } ] ``` I have a class defined as: ```java public class MyCustomObject { private int id; private String name; // Getters and setters public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } } ``` When I attempt to deserialize the JSON string using the following code: ```java ObjectMapper objectMapper = new ObjectMapper(); List<MyCustomObject> objects = objectMapper.readValue(jsonString, new TypeReference<List<MyCustomObject>>() {}); ``` I am getting the following behavior: ``` com.fasterxml.jackson.databind.exc.InvalidFormatException: want to deserialize value of type `java.util.List<MyCustomObject>` from String "[ { "id": 1, "name": "Object1" }, { "id": 2, "name": "Object2" } ]": not a valid `JsonNode`\n``` I've verified that `jsonString` is indeed a valid JSON array format, and I've also tried using different configurations for the `ObjectMapper`, like enabling features for accepting single quotes or disabling the unexpected result on empty beans. But nothing seems to resolve this scenario. Is there a specific configuration or method that I might be missing? I would appreciate any insights or suggestions on how to resolve this deserialization scenario. This is happening in both development and production on Windows 11. Am I approaching this the right way?