Protostuff runtime schema and polymorphism

[slux83]

Hi,

I have a hierarchy of classes in Java that I want to serialize and deserialize using protostuff.

The classes are the following (just a toy example)

class Wrapper {
    public List<Being> beings;
}

class Being {
    public Animal animal;
}

class Animal {
    public String sex;
    public int legs;
}

class Antelope extends Animal {
    public int speed;
    public String furType;
}

class Spider extends Animal {
    public int numberOfEyes;
    public int size;
}

I'm using the following code to serialize and deserialize the objects using runtime schema generation as the following

public static void main(String[] args) {
    LinkedBuffer buffer = LinkedBuffer.allocate(1024 * 1024);

    Being b1 = new Being();
    Antelope a1 = new Antelope();
    a1.legs = 4;
    a1.furType = "Fuzzy";
    a1.sex = "M";
    a1.speed = 70;
    b1.animal = a1;

    Being b2 = new Being();
    Spider s1 = new Spider();
    s1.legs = 4;
    s1.sex = "M";
    s1.numberOfEyes = 8;
    s1.size = 2;
    b2.animal = s1;

    Wrapper w = new Wrapper();
    w.beings = new ArrayList<>();
    w.beings.add(b1);
    w.beings.add(b2);

    // Serialize
    Schema<Wrapper> schema = RuntimeSchema.getSchema(Wrapper.class);
    byte[] data = ProtostuffIOUtil.toByteArray(w, schema, buffer);

    // Deserialize
    Wrapper w1 = schema.newMessage();
    ProtostuffIOUtil.mergeFrom(data, w1, schema);

    System.out.println(w1.beings.get(0).animal.getClass());
    System.out.println(w1.beings.get(1).animal.getClass());
}

This code produces 

class Animal
class Animal

So it seems the information about the real sub-class is lost somewhere.

How can I do to preserve the sub-class information?

I'd like to have as output

class Antelope
class Spider

Thanks

[David Yu]

If your object heirarchy involves a concrete class subclassing another concrete class (not using abstract classes), set: -Dprotostuff.runtime.morph_non_final_pojos=true

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[David Yu]

For more info, see https://protostuff.github.io/docs/protostuff-runtime/

[slux83]

Many thanks! It worked!