Why my typereference not work?

Here is my code.

First, I have two classes:

public abstract class AbstractTypeReference<T> {
    public Type type();
    public AbstractTypeReference() {
        Type superClass = getClass().getGenericSuperclass();
        type = ((ParameterizedType) superClass).getActualTypeArguments()[0];
    }
}

public class MyTypeReference<T> extends AbstractTypeReference<T> {
    public MyTypeReference() {
        super();
    }
}

Then, I run following code:

MyTypeReference<String> ref = new MyTypeReference<String>();
System.out.println(ref.type.toString());

I expect to get java.lang.String as output, but get T instead. The code was copied from com.fasterxml.jackson.core.type. But it works well. Could anyone tell me what is wrong? And why?