import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

public class Test {

    @JsonTypeInfo( use=JsonTypeInfo.Id.CLASS)
    @JsonSubTypes({ @JsonSubTypes.Type(value = ConcreteA.class)})
    public static interface A {
    }

    public static class ConcreteA implements A {
    }

    @JsonTypeInfo( use=JsonTypeInfo.Id.CLASS)
    @JsonSubTypes({ @JsonSubTypes.Type(value = ConcreteB.class)})
    public static interface B {
    }

    public static class ConcreteB implements B {
        A a;
        public A getA() {
            return a=new ConcreteA();
        }
    }

    @org.junit.Test
    public void testSerialisation() throws JsonProcessingException {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
        System.out.println(objectMapper.writeValueAsString(new ConcreteB()));
    }
}