D-Net

            return obj;

        Class returnType = obj.get(0).getClass();

        String json = mapper.writeValueAsString(obj);

        return mapper.readValue(json,TypeFactory.defaultInstance().constructCollectionType(List.class,returnType));

    }

        Class returnType = ((MethodSignature) pjp.getSignature()).getMethod().getReturnType();

        ObjectMapper mapper = new ObjectMapper();

        String json = mapper.writeValueAsString(returnType.cast(obj));

        return mapper.readValue(json, returnType);

    }