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kotlinlang

<https://stackoverflow.com/questions/66917521/spring-boot-redis-sets-the-object-as-empty-json>

Your properties are private, so Jackson doesn’t serialize them I guess. They should be public.

the annotation is also wrong, you need `@field:JsonProperty` or `@get:JsonProperty`. though in your case it will not make a difference, since the property name you chose is the same of the field name

<@U0CLJ884B> that worked. it store data as json "`{\"postId\":10000020,\"userId\":10000001}"`  but when trying to access data, it throws `at [Source: (byte[])"{"postId":10000020,"userId":10000001}"; line: 1, column: 37]; nested exception is com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Missing type id when trying to resolve subtype of [simple type, class java.lang.Object]: missing type id property '@class'`

It worked by adding
```@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS)```
to class TimelinePost