Hi,

Did you check on google?

I see that 
https://www.google.com/search?q=xwiki+check+if+a+user+is+in+a+group&oq=xwiki+check+if+a+user+is+in+a+group
 returns several topics related to this.

Thanks
-Vincent

On 13 Jun 2014 at 09:04:28, Daniel Ebanja 
(danieleba...@googlemail.com(mailto:danieleba...@googlemail.com)) wrote:

> Hi,
> how can I check programmatically that a certain member is in a group.
> I need this in my custom authentication, to prevent the same user from been
> added several times to the same group.
> Thanks
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