[email protected] wrote:
Bob,

Great, thanks a lot, it's a pure java solution and is working fine.

It's clear that if i would like to preserve other sessions trying to do the 
same, i should use a global object, in this case, could i use the ClickServlet 
or something like that ?

You mean you only want one request to be processed at a time for all users? In that case you could synchronize on
the ServletContext which is application scoped:

public void onInit() {
   Context context = getContext();
   synchronize(context.getServletContext()) {

   }
}


bob

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