gistfile1.txt

        ObjectMapper mapper = new ObjectMapper();
        mapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.NON_FINAL, "@class");
        ObjectMapper.DefaultTypeResolverBuilder resolverBuilder = new ObjectMapper.DefaultTypeResolverBuilder(ObjectMapper.DefaultTyping.NON_FINAL);
        resolverBuilder.init(JsonTypeInfo.Id.CLASS, null).inclusion(JsonTypeInfo.As.PROPERTY);
        resolverBuilder.typeProperty("@class");
        mapper.setDefaultTyping(resolverBuilder);
        SubtypeResolver subtypeResolver = mapper.getSubtypeResolver();
        subtypeResolver.registerSubtypes(new NamedType(A.class, "Uvw"));
        subtypeResolver.registerSubtypes(new NamedType(B.class, "Xyz"));
        mapper.setSubtypeResolver(subtypeResolver);

        A a = new A();
        a.name = "1";
        System.out.println(mapper.writeValueAsString(a));
        B b = new B();
        b.name = "2";
        System.out.println(mapper.writeValueAsString(b));

        System.out.println(mapper.readValue("{\"@class\":\"Library$B\",\"name\":\"1\"}", C.class));
        Object c = new A();
        aa(c);