Handling JSON Deserialization with Polymorphism in Java using Jackson
I'm not sure how to approach I'm writing unit tests and I'm stuck on something that should probably be simple... I'm working with an scenario when trying to deserialize a polymorphic JSON structure into a Java object using Jackson. My JSON looks like this: ```json [ { "type": "cat", "name": "Whiskers", "age": 3 }, { "type": "dog", "name": "Rex", "age": 5 } ] ``` I have a base class `Animal` and two subclasses `Cat` and `Dog`. Here's how I've set them up: ```java abstract class Animal { String name; int age; } class Cat extends Animal { // Additional cat-specific properties } class Dog extends Animal { // Additional dog-specific properties } ``` To handle the polymorphism, I registered a `TypeResolverBuilder`. The deserialization process throws an behavior: ``` com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class Dog] ``` I've attempted to annotate my classes with `@JsonTypeInfo` and `@JsonSubTypes`, but I keep getting the same behavior. Here’s the code snippet I used for the annotations: ```java @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type") @JsonSubTypes({ @JsonSubTypes.Type(value = Cat.class, name = "cat"), @JsonSubTypes.Type(value = Dog.class, name = "dog") }) abstract class Animal { // properties } ``` I also made sure to include the Jackson dependencies in my Maven `pom.xml`: ```xml <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.13.0</version> </dependency> ``` Despite all this, I'm still unable to deserialize the JSON properly. What am I missing? Any help would be greatly appreciated! This issue appeared after updating to Java 3.11. Any advice would be much appreciated. This is my first time working with Java 3.10. Has anyone dealt with something similar? Am I missing something obvious?