Hello XWiki exports,

I've been working on a tool to massively import users from a spreadsheets for 
curriki.org (still on xwiki 3.5.1) and I am stumbling into an error that I 
could not solve thus far: 

> org.hibernate.StaleObjectStateException: Row was updated or deleted by 
> another transaction (or unsaved-value mapping was incorrect): 
> [com.xpn.xwiki.objects.LargeStringProperty#<?xml version="1.0" 
> encoding="UTF-8"?>
> <users>poiapsaodi</users>]


(user-name is invented)

The users element is that of the xwikiRights object.
This exception happens at a saveandcontinue action which is triggered in the 
object editor after I (as admin) edit the user. It also happens if the user is 
logged in.


How can I investigate this?
I've tried changing the way I write the object in the following (adding the 
"new String") as it was done in the social-login but still no hope:
        def rightobj = userDoc.newObject("XWiki.XWikiRights", xcontext);
        rightobj.setStringValue("users", new String(userName));
        rightobj.setStringValue("allow", new String("1"));
        rightobj.setStringValue("levels", new String("edit"));
        rightobj.setStringValue("groups", new String(""));

Note: at curriki, we use the "virtual xwikiUsers group" since we have quite an 
amount of them.

Any investigation hint is welcome.

paul
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