Spring Session Redis Auto DeSerializer un-unsed keys - redis

Question

we are using spring-session-data-redis starter, and meet one problem during this process.
We have two application A and B, and want to share same redis between A and B.
the problem is as below:
We call API in application A to add one User object to current Session:(url: http://localhost:9001/test) logic as below.
#RequestMapping("/test")
#ResponseBody
public User addUser(HttpServletRequest httpServletRequest) {
User user = new User("TEST", 10);
HttpSession session = httpServletRequest.getSession(true);
session.setAttribute("SESSION_USER", user);
return user;
}
Then call API in application B to visit another service ( this service is very simple, return a String) (url: http://localhost:9002/test) logic as below.
#RequestMapping("/test")
public String test() {
return "OK";
}
But application B will return error when visit url: http://localhost:9002/test, and application B does not have this class(com.du.demo.demo1.controller.model.User) under classpath..
There was an unexpected error (type=Internal Server Error, status=500).
Could not read JSON: Could not resolve type id 'com.du.demo.demo1.controller.model.User' into a subtype of [simple type, class java.lang.Object]: no such class found at [Source: [B#703e37; line: 1, column: 11]; nested exception is com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Could not resolve type id 'com.du.demo.demo1.controller.model.User' into a subtype of [simple type, class java.lang.Object]: no such class found at [Source: [B#703e37; line: 1, column: 11]
My question is that whether there are some configuration to skip this? Exception will only throw when we use this object? Just want to stop the automatically deserialize process...