implementing Spring Boot 2.6.x and Jackson Deserialization of Polymorphic Types
I'm having trouble with I've encountered a strange issue with I'm experiencing a question with deserializing a polymorphic type using Jackson in my Spring Boot 2.6.x application. I have a base class `Animal` and two subclasses, `Dog` and `Cat`. The JSON I'm trying to deserialize looks like this: ```json { "type": "Dog", "name": "Buddy" } ``` However, when I attempt to deserialize this JSON into an `Animal` object, I get the following behavior: ``` com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class Animal] ``` I've annotated my classes like this: ```java @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type") @JsonSubTypes({ @JsonSubTypes.Type(value = Dog.class, name = "Dog"), @JsonSubTypes.Type(value = Cat.class, name = "Cat") }) public abstract class Animal { private String name; // getters and setters } public class Dog extends Animal { // Dog specific fields } public class Cat extends Animal { // Cat specific fields } ``` I have tried adding a default constructor to the `Animal` class, but that didn't resolve the scenario. Also, I ensured that the `@JsonTypeInfo` annotation is properly configured. My Jackson dependency version is `2.12.3`, which should be compatible with Spring Boot 2.6.x. Is there something I'm missing in the configuration? How can I resolve this deserialization scenario without changing the structure of my classes? Any advice would be much appreciated. Is this even possible?