T5: How to set persisted variable to null

[Angelo Chen]

Hi,

I have this class:
public class Confirmation {

    @Persist
    private String uid;

    public Class onActivate(String id) {
        if (uid == null) {
            uid = id;
        }
        return null;
 }

    public String onPassivate()  { return uid;}
   
    String onActionFromAutoLogin() {
        uid = null;
        return "MyPage";
    }
}

even i set uid to null, it is still not null next time when the page is
activated, why? what's the correct way of setting a persisted variable null?
Thanks.
A.C.

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