Java – Jackson polymorphism: how to map multiple subtypes to the same class

I'm using Jackson 1.9 x.

Suppose I have an animal class:

public class Animal {
    private String type;
    // accessors
}

public class Mammal extends Animal {
    private String diet;
    // accessors
}

public class Bird extends Animal {
    private boolean tropical;
    // accessors
}

I want to do this (I map several subtypes to one class and another)

@JsonTypeInfo(use = Id.NAME,include = As.PROPERTY,property = "type")
@JsonSubTypes({@JsonSubTypes.Type(value = Mammal.class,name = "Dog"),@JsonSubTypes.Type(value = Mammal.class,name = "Cat"),@JsonSubTypes.Type(value = Bird.class,name = "Dodo"},name = "Cockatoo"})
public class Animal {

}

What I see now is that Jackson only recognizes the "dog to mammal" and "dodo to bird" mappings This is because stdsubtyperesolver_ Collectandresolve() allows the same class to be registered only once (due to the implementation of namedtype. Equals())

Is there a solution to the problem I see?

Solution

Maybe not using comments The problem is that this mapping does not work for serialization, and existing mappings do require a one-to-one (two-way) relationship