deserializing subtypes

[ashr123]

See the following code:

import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import tools.jackson.databind.json.JsonMapper;

@JsonTypeInfo(
        use = JsonTypeInfo.Id.SIMPLE_NAME,   // add a "type" property
        include = JsonTypeInfo.As.PROPERTY
)
@JsonSubTypes({
        @JsonSubTypes.Type(Animal.Dog.class),
        @JsonSubTypes.Type(Animal.Cat.class)
})
sealed interface Animal {
    static void main() {
        System.out.println(new JsonMapper()
                //language=JSON
                .readValue("""
                                {
                                  "@type": "Dog",
                                  "name": "Rex",
                                  "age": 5
                                }""",
                        Animal.class
                )); // Dog[name=Rex, age=5]
    }

    record Dog(String name, int age) implements Animal {
    }

    record Cat(String name, boolean indoor) implements Animal {
    }
}

is there a way to not mention JsonSubTypes? or make it figure it out on it's own? maybe if there is a sealed interface?

[pjfanning]

Have a look at https://github.com/sigpwned/jackson-modules-java-17-sealed-classes

I'm travelling so don't have good web access. I vaguely recall that the above code was merged in Jackson 3 but if you use Jackson 2, you will need to use that sealed classes extension.

[cowtowncoder]

See FasterXML/jackson-databind#5025 -- support is in 3.0.0 I think.